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Bifurcated Fiber Bundles: 2 Fibers


  • High-OH (UV to NIR), Low-OH (Visible to IR), and ZrF4 (UV to MIR) Fiber
  • Seven Fiber Core Sizes from Ø50 µm to Ø1000 µm
  • Custom Fiber Bundles Also Available

BFY105HS02

Ø105 µm Core Fiber,
High OH

SMA905 Connector

SMA905 Connector

Common Connector Face

BFY400 Shown: Two 400 µm Core Fibers

Breakout
Junction

SMA905 Connector

SMA905 Connectors

FC/PC Connectors (Select Bundles)

Related Items


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Fiber Y Bundle Schematic
Click to Enlarge

Bifurcated Fiber Bundle Schematic (Not to Scale)
Typical Applications
  • Channel Broadband Emission from a Sample into Multiple Detectors
  • Fluorescence Microscopy Emission Collection
  • Spectroscopy
  • Illumination
Y Cable Connector Sleeves
Click to Enlarge

The stainless steel sleeve at the end of each leg is engraved with information about the fiber. The example fiber bundle with SMA905 connectors shown here has a mix of high-OH and low-OH legs. We also offer bundles with two high-OH legs, two low-OH legs, or two ZrF4 legs.

Features

  • Y-Cables with One of Four Fiber Configurations
    • High OH (UV Enhanced)
    • Low OH (IR Enhanced)
    • Mixed (One Low OH and One High OH)
    • ZrF4 (UV to MIR)
  • SMA905 or FC/PC 2.0 mm Narrow Key Connectors Terminate All Ends
  • 7 Core Sizes from Ø50 µm to Ø1000 µm
  • Dust Cap for Each Connector Included
  • Custom Versions Available

Thorlabs' Bifurcated Fiber Bundles, also known as fanout or Y-cables, are constructed from two high-grade optical fibers encased in stainless steel tubing for durability. We offer these bundles with seven fiber core sizes from Ø50 µm to Ø1000 µm. As shown in the table below, they are available with two high-OH fibers, two low-OH fibers, one high-OH and one low-OH fiber, or two ZBLAN ZrF4 fibers. ZrF4 fiber bundles are particularly advantageous for spectroscopy, as they offer exceptionally broad transmission from the UV into the mid-IR (285 nm - 4.5 µm). 

All three ends of the cable are terminated with SMA905 or FC/PC connectors. SMA905 connectors are available for each fiber type and diameter. FC/PC connectors are available for high-OH fibers with a 200 or 400 µm core diameter. The stainless steel sleeves of the connectors on the breakout legs of the cable are engraved to indicate the fiber type in each leg. The sleeve of the common connector is engraved with the fiber core size and numerical aperture (NA).

One leg of each bundle contains both fibers before passing through a junction where the cable splits into two legs, each containing a single fiber. Cables with high-OH and/or low-OH fibers are 2 m long from the common end to the split ends, while cables with ZrF4 fibers are 0.5 m long from the common end to the split ends. See the table below for a summary of the dimensions. The two legs are threaded through a sliding clamp so that the breakout length of the cable can be adjusted. The clamp can be locked in place by tightening the 5/64" (2 mm) hex setscrew. A 5/64" (2 mm) hex key is included with each bundle.

When using the common end as the input, these cables perform best when used with sources that provide even illumination across both fiber cores, such as LEDs with a large emitter angle or white light sources like Thorlabs' Stabilized Light Sources. The photos below and to the right illustrate the end face geometry in the common connector.

Each patch cable includes three protective fiber caps that shield the connector ends from dust and other hazards. Bundles with SMA905 connectors include metal CAPSM dust caps;  CAPM Rubber Fiber Caps can be purchased as an alternative option. Bundles with FC/PC connectors include CAPF Plastic Dust Caps.

Custom fiber bundles are available upon request, including straight bundles and bifurcated fiber bundles with one common connector split into two or more connectors. See the Custom Bundles tab for an overview of some of our custom bundle capabilities. Please contact Tech Support for details.

Item # Prefix BFY50 BFY105 BFY200 BFY400 BFY600 BFY1000 BFYZ4 BFYZ6
Fiber Core Size
Ø50 µm Ø105 µm Ø200 µm Ø400 µm Ø600 µm Ø1000 µm Ø450 µm Ø600 µm
Fiber Types
High OH or Low OH High OH, Low OH,
or Mixed
High OH or Low OH High OH or Low OH ZrF4
Wavelength Range 250 - 1200 nm(High OH)
400 - 2400 nm (Low OH)
300 - 1200 nm (High OH)
400 - 2200 nm (Low OH)
285 nm - 4.5 µm
Fiber Attenuation Plot
NAb 0.22 ± 0.02 0.39 ± 0.02 0.20 ± 0.02 @ 2.0 µm
# of Active Fibersc 2
Total Length 2 +0.075 / -0.0 m 0.5 +0.10 / -0.0 m
Common Leg Length 0.10 ± 0.03 m 0.07 +0.02 / -0.00 m
Junction Length 1.63" (41.4 mm) 2.09" (53 mm) 2.36" (60 mm)
Max Breakout Lengthd 1.85 m 0.37 m 0.36 m
Connectors SMA905 SMA905 or FC/PCe SMA905
  • Solarization may occur over time when used below 300 nm. Please click here to view our selection of solarization-resistant bare MM fiber.
  • The NA of the bundle is the same as that of the individual fibers.
  • The common end of our BFY1000 cables has two dark fibers that help align the active fibers during manufacturing
  • Specified with the clamp adjacent to the breakout junction.
  • FC/PC Connectors available for High-OH bundles. Please contact Tech Support for additional options.
Y Cable Common Connector
Click for Details

The common end of a Ø50 µm core Y-bundle. Details of the core, cladding, and epoxy can be seen.

Y Cable Common Connector
Click for Details

The common end of a Ø105 µm core Y-bundle. Details of the core, cladding, and epoxy can be seen.
Fan Out Cable
Click to Enlarge

Custom 1-to-4 Fan-Out Cable

Sample Fiber Bundle Connector Configurations

Custom Fiber Bundles

Thorlabs is pleased to offer custom straight and fan-out fiber bundles with random or mapped fiber configurations. The table below outlines some of our current bundle production capabilities. We are in the process of expanding these production capabilities, so do not hesitate to inquire if you do not see the bundle that you require described here.

Some custom bundles will require techniques outside of our usual production processes. As a result, we cannot guarantee that we will be able to make a bundle configuration to fit the requirements of your specific application. However, our engineers will be happy to work with you to determine if Thorlabs can produce a fiber bundle that fulfills your needs. To receive a quote, please provide a drawing or draft of your bundle configuration.

Fluoride Fiber Bundle
Click to Enlarge

Custom Silica Fiber Bundle with SMA905 Connectors
Custom Bundle Capabilities
Bundle
Configuration
Straighta Fan Out (2 or More Legs)a,b
Fiber
Types
Single Mode Standard (320 to 2100 nm), Ultra-High NA (960 to 1600 nm),
Photosensitive (980 to 1600 nm)
Multimode 0.10 NA Step Index (280 to 750 nm), 0.22 NA Step Index (190 to 2500 nm),
0.39 NA Step Index (300 to 2200 nm), Multimode Graded Index (750 to 1450 nm),
Multimode ZrF4 (285 nm to 4.5 µm)
Tubing Optionsc Thorlabs' Stock Furcation Tubing, Stainless Steel Tubing or Black Heat Shrink Tubing
Connectors SMA905 (Ø2 mm Max Cored), FC/PC (Ø800 µm Max Cored),
Ø1/4" Probe, or Flat-Cleaved Unterminated Fiber
Length Tolerancee ±0.14 m
Active Area
Geometryf
Round or Linear
Angle Polishing On Special Request. Available for up to Ø105 µm Core on Single Fiber End.
Please Inquire for More Information.
  • In a bundle of 20 fibers, up to one dark fiber is typical (i.e., 95% of the fibers in a bundle will be unbroken). For bundles with more than a single fiber per leg, 5-10% of the fibers are typically dark.
  • These bundles are not intended for applications that require an even power distribution.
  • Tubing selection will be further constrained by fiber type, number of fibers in the bundle, and length. Typically, more than one type of tubing will be used in the custom bundle, particularly for fan-out bundles.
  • This represents the maximum core diameter for the common end fiber. Split end fibers have core diameters that add to the common connector core diameter.
  • The length tolerance applies to bundles ≤2 m. To discuss tolerances on longer bundles, please contact techsupport@thorlabs.com.
  • We cannot guarantee the distance between the fibers or the geometrical structure at the common end of a fan-out bundle.

Our cable engineers are available to help manufacture a bundle for your application.
Please contact techsupport@thorlabs.com with your custom bundle requests.
Please provide a drawing or draft of your custom bundle to expedite quote processing.

The content in this tab is specific to the fibers used in our high OH, low OH, and mixed fiber bundles. It is not intended as guidance for our ZrF4 fiber bundles.

Laser-Induced Damage in Silica Optical Fibers

The following tutorial details damage mechanisms relevant to unterminated (bare) fiber, terminated optical fiber, and other fiber components from laser light sources. These mechanisms include damage that occurs at the air / glass interface (when free-space coupling or when using connectors) and in the optical fiber itself. A fiber component, such as a bare fiber, patch cable, or fused coupler, may have multiple potential avenues for damage (e.g., connectors, fiber end faces, and the device itself). The maximum power that a fiber can handle will always be limited by the lowest limit of any of these damage mechanisms.

While the damage threshold can be estimated using scaling relations and general rules, absolute damage thresholds in optical fibers are very application dependent and user specific. Users can use this guide to estimate a safe power level that minimizes the risk of damage. Following all appropriate preparation and handling guidelines, users should be able to operate a fiber component up to the specified maximum power level; if no maximum is specified for a component, users should abide by the "practical safe level" described below for safe operation of the component. Factors that can reduce power handling and cause damage to a fiber component include, but are not limited to, misalignment during fiber coupling, contamination of the fiber end face, or imperfections in the fiber itself. For further discussion about an optical fiber’s power handling abilities for a specific application, please contact Thorlabs’ Tech Support.

Power Handling Limitations Imposed by Optical Fiber
Click to Enlarge

Undamaged Fiber End
Power Handling Limitations Imposed by Optical Fiber
Click to Enlarge

Damaged Fiber End

Damage at the Air / Glass Interface

There are several potential damage mechanisms that can occur at the air / glass interface. Light is incident on this interface when free-space coupling or when two fibers are mated using optical connectors. High-intensity light can damage the end face leading to reduced power handling and permanent damage to the fiber. For fibers terminated with optical connectors where the connectors are fixed to the fiber ends using epoxy, the heat generated by high-intensity light can burn the epoxy and leave residues on the fiber facet directly in the beam path.

Estimated Optical Power Densities on Air / Glass Interfacea
Type Theoretical Damage Thresholdb Practical Safe Levelc
CW
(Average Power)
~1 MW/cm2 ~250 kW/cm2
10 ns Pulsed
(Peak Power)
~5 GW/cm2 ~1 GW/cm2
  • All values are specified for unterminated (bare) silica fiber and apply for free space coupling into a clean fiber end face.
  • This is an estimated maximum power density that can be incident on a fiber end face without risking damage. Verification of the performance and reliability of fiber components in the system before operating at high power must be done by the user, as it is highly system dependent.
  • This is the estimated safe optical power density that can be incident on a fiber end face without damaging the fiber under most operating conditions.

Damage Mechanisms on the Bare Fiber End Face

Damage mechanisms on a fiber end face can be modeled similarly to bulk optics, and industry-standard damage thresholds for UV Fused Silica substrates can be applied to silica-based fiber. However, unlike bulk optics, the relevant surface areas and beam diameters involved at the air / glass interface of an optical fiber are very small, particularly for coupling into single mode (SM) fiber. therefore, for a given power density, the power incident on the fiber needs to be lower for a smaller beam diameter.

The table to the right lists two thresholds for optical power densities: a theoretical damage threshold and a "practical safe level". In general, the theoretical damage threshold represents the estimated maximum power density that can be incident on the fiber end face without risking damage with very good fiber end face and coupling conditions. The "practical safe level" power density represents minimal risk of fiber damage. Operating a fiber or component beyond the practical safe level is possible, but users must follow the appropriate handling instructions and verify performance at low powers prior to use.

Calculating the Effective Area for Single Mode and Multimode Fibers
The effective area for single mode (SM) fiber is defined by the mode field diameter (MFD), which is the cross-sectional area through which light propagates in the fiber; this area includes the fiber core and also a portion of the cladding. To achieve good efficiency when coupling into a single mode fiber, the diameter of the input beam must match the MFD of the fiber.

As an example, SM400 single mode fiber has a mode field diameter (MFD) of ~Ø3 µm operating at 400 nm, while the MFD for SMF-28 Ultra single mode fiber operating at 1550 nm is Ø10.5 µm. The effective area for these fibers can be calculated as follows:

SM400 Fiber: Area = Pi x (MFD/2)2 = Pi x (1.5 µm)2 = 7.07 µm= 7.07 x 10-8 cm2

 SMF-28 Ultra Fiber: Area = Pi x (MFD/2)2 = Pi x (5.25 µm)2 = 86.6 µm= 8.66 x 10-7 cm2

To estimate the power level that a fiber facet can handle, the power density is multiplied by the effective area. Please note that this calculation assumes a uniform intensity profile, but most laser beams exhibit a Gaussian-like shape within single mode fiber, resulting in a higher power density at the center of the beam compared to the edges. Therefore, these calculations will slightly overestimate the power corresponding to the damage threshold or the practical safe level. Using the estimated power densities assuming a CW light source, we can determine the corresponding power levels as:

SM400 Fiber: 7.07 x 10-8 cm2 x 1 MW/cm2 = 7.1 x 10-8 MW = 71 mW (Theoretical Damage Threshold)
     7.07 x 10-8 cm2 x 250 kW/cm2 = 1.8 x 10-5 kW = 18 mW (Practical Safe Level)

SMF-28 Ultra Fiber: 8.66 x 10-7 cm2 x 1 MW/cm2 = 8.7 x 10-7 MW = 870 mW (Theoretical Damage Threshold)
           8.66 x 10-7 cm2 x 250 kW/cm2 = 2.1 x 10-4 kW = 210 mW (Practical Safe Level)

The effective area of a multimode (MM) fiber is defined by the core diameter, which is typically far larger than the MFD of an SM fiber. For optimal coupling, Thorlabs recommends focusing a beam to a spot roughly 70 - 80% of the core diameter. The larger effective area of MM fibers lowers the power density on the fiber end face, allowing higher optical powers (typically on the order of kilowatts) to be coupled into multimode fiber without damage.

Damage Mechanisms Related to Ferrule / Connector Termination


Click to Enlarge
Plot showing approximate input power that can be incident on a single mode silica optical fiber with a termination. Each line shows the estimated power level due to a specific damage mechanism. The maximum power handling is limited by the lowest power level from all relevant damage mechanisms (indicated by a solid line).

Fibers terminated with optical connectors have additional power handling considerations. Fiber is typically terminated using epoxy to bond the fiber to a ceramic or steel ferrule. When light is coupled into the fiber through a connector, light that does not enter the core and propagate down the fiber is scattered into the outer layers of the fiber, into the ferrule, and the epoxy used to hold the fiber in the ferrule. If the light is intense enough, it can burn the epoxy, causing it to vaporize and deposit a residue on the face of the connector. This results in localized absorption sites on the fiber end face that reduce coupling efficiency and increase scattering, causing further damage.

For several reasons, epoxy-related damage is dependent on the wavelength. In general, light scatters more strongly at short wavelengths than at longer wavelengths. Misalignment when coupling is also more likely due to the small MFD of short-wavelength SM fiber that also produces more scattered light.

To minimize the risk of burning the epoxy, fiber connectors can be constructed to have an epoxy-free air gap between the optical fiber and ferrule near the fiber end face. Our high-power multimode fiber patch cables use connectors with this design feature.

Determining Power Handling with Multiple Damage Mechanisms

When fiber cables or components have multiple avenues for damage (e.g., fiber patch cables), the maximum power handling is always limited by the lowest damage threshold that is relevant to the fiber component. In general, this represents the highest input power that can be incident on the patch cable end face and not the coupled output power.

As an illustrative example, the graph to the right shows an estimate of the power handling limitations of a single mode fiber patch cable due to damage to the fiber end face and damage via an optical connector. The total input power handling of a terminated fiber at a given wavelength is limited by the lower of the two limitations at any given wavelength (indicated by the solid lines). A single mode fiber operating at around 488 nm is primarily limited by damage to the fiber end face (blue solid line), but fibers operating at 1550 nm are limited by damage to the optical connector (red solid line).

In the case of a multimode fiber, the effective mode area is defined by the core diameter, which is larger than the effective mode area for SM fiber. This results in a lower power density on the fiber end face and allows higher optical powers (on the order of kilowatts) to be coupled into the fiber without damage (not shown in graph). However, the damage limit of the ferrule / connector termination remains unchanged and as a result, the maximum power handling for a multimode fiber is limited by the ferrule and connector termination. 

Please note that these are rough estimates of power levels where damage is very unlikely with proper handling and alignment procedures. It is worth noting that optical fibers are frequently used at power levels above those described here. However, these applications typically require expert users and testing at lower powers first to minimize risk of damage. Even still, optical fiber components should be considered a consumable lab supply if used at high power levels.

Intrinsic Damage Threshold

In addition to damage mechanisms at the air / glass interface, optical fibers also display power handling limitations due to damage mechanisms within the optical fiber itself. These limitations will affect all fiber components as they are intrinsic to the fiber itself. Two categories of damage within the fiber are damage from bend losses and damage from photodarkening. 

Bend Losses
Bend losses occur when a fiber is bent to a point where light traveling in the core is incident on the core/cladding interface at an angle higher than the critical angle, making total internal reflection impossible. Under these circumstances, light escapes the fiber, often in a localized area. The light escaping the fiber typically has a high power density, which burns the fiber coating as well as any surrounding furcation tubing.

A special category of optical fiber, called double-clad fiber, can reduce the risk of bend-loss damage by allowing the fiber’s cladding (2nd layer) to also function as a waveguide in addition to the core. By making the critical angle of the cladding/coating interface higher than the critical angle of the core/clad interface, light that escapes the core is loosely confined within the cladding. It will then leak out over a distance of centimeters or meters instead of at one localized spot within the fiber, minimizing the risk of damage. Thorlabs manufactures and sells 0.22 NA double-clad multimode fiber, which boasts very high, megawatt range power handling.

Photodarkening
A second damage mechanism, called photodarkening or solarization, can occur in fibers used with ultraviolet or short-wavelength visible light, particularly those with germanium-doped cores. Fibers used at these wavelengths will experience increased attenuation over time. The mechanism that causes photodarkening is largely unknown, but several fiber designs have been developed to mitigate it. For example, fibers with a very low hydroxyl ion (OH) content have been found to resist photodarkening and using other dopants, such as fluorine, can also reduce photodarkening.

Even with the above strategies in place, all fibers eventually experience photodarkening when used with UV or short-wavelength light, and thus, fibers used at these wavelengths should be considered consumables.

Preparation and Handling of Optical Fibers

General Cleaning and Operation Guidelines
These general cleaning and operation guidelines are recommended for all fiber optic products. Users should still follow specific guidelines for an individual product as outlined in the support documentation or manual. Damage threshold calculations only apply when all appropriate cleaning and handling procedures are followed.

  1. All light sources should be turned off prior to installing or integrating optical fibers (terminated or bare). This ensures that focused beams of light are not incident on fragile parts of the connector or fiber, which can possibly cause damage.

  2. The power-handling capability of an optical fiber is directly linked to the quality of the fiber/connector end face. Always inspect the fiber end prior to connecting the fiber to an optical system. The fiber end face should be clean and clear of dirt and other contaminants that can cause scattering of coupled light. Bare fiber should be cleaved prior to use and users should inspect the fiber end to ensure a good quality cleave is achieved.

  3. If an optical fiber is to be spliced into the optical system, users should first verify that the splice is of good quality at a low optical power prior to high-power use. Poor splice quality may increase light scattering at the splice interface, which can be a source of fiber damage.

  4. Users should use low power when aligning the system and optimizing coupling; this minimizes exposure of other parts of the fiber (other than the core) to light. Damage from scattered light can occur if a high power beam is focused on the cladding, coating, or connector.

Tips for Using Fiber at Higher Optical Power
Optical fibers and fiber components should generally be operated within safe power level limits, but under ideal conditions (very good optical alignment and very clean optical end faces), the power handling of a fiber component may be increased. Users must verify the performance and stability of a fiber component within their system prior to increasing input or output power and follow all necessary safety and operation instructions. The tips below are useful suggestions when considering increasing optical power in an optical fiber or component.

  1. Splicing a fiber component into a system using a fiber splicer can increase power handling as it minimizes possibility of air/fiber interface damage. Users should follow all appropriate guidelines to prepare and make a high-quality fiber splice. Poor splices can lead to scattering or regions of highly localized heat at the splice interface that can damage the fiber.

  2. After connecting the fiber or component, the system should be tested and aligned using a light source at low power. The system power can be ramped up slowly to the desired output power while periodically verifying all components are properly aligned and that coupling efficiency is not changing with respect to optical launch power.

  3. Bend losses that result from sharply bending a fiber can cause light to leak from the fiber in the stressed area. When operating at high power, the localized heating that can occur when a large amount of light escapes a small localized area (the stressed region) can damage the fiber. Avoid disturbing or accidently bending fibers during operation to minimize bend losses.

  4. Users should always choose the appropriate optical fiber for a given application. For example, large-mode-area fibers are a good alternative to standard single mode fibers in high-power applications as they provide good beam quality with a larger MFD, decreasing the power density on the air/fiber interface.

  5. Step-index silica single mode fibers are normally not used for ultraviolet light or high-peak-power pulsed applications due to the high spatial power densities associated with these applications.


Posted Comments:
maudolci  (posted 2017-01-27 16:40:00.847)
Dear Customer Support Service, is it possible to manufacture a bifurcated single-mode fiber by assembling LMA-10 (transmission from 400 to 1700 nm) and SM2000 (transmission from 1.7 to 2.3 micron), in order to have a system with two output single-mode fibers providing light over the full 400-2300 nm range ? Thanks in advance for your reply. Dr. Mauro Dolci Italian National Institute for Astrophysics
pbui  (posted 2017-01-30 04:31:49.0)
Thank you for your inquiry. Currently, we are unable to provide bifurcated patch cables that include PCF fibers. However, we are constantly working on adding new capabilities and services and hope to offer PCF termination services in the future. We will follow up with you to discuss your cable requirements and provide an alternative solution if possible.
aroy  (posted 2017-01-06 12:50:36.473)
Would it be possible for you to re-terminate the bifurcated ends to FC connector?
tfrisch  (posted 2017-01-06 01:23:18.0)
Hello, thank you for contacting Thorlabs. We should be able to reterminate, though each fiber would be shorter since we must cut off the old connector. I will put you in touch with our Tech Support Team.

High OH Fiber Bundles, SMA905 or FC/PC

  • 250 - 1200 nm or 300 - 1200 nm Wavelength Range (See Table Below)
  • SMA905 or FC/PC 2.0 mm Narrow Key Connectors Terminate All Ends
  • 2 m Total Length from Common End to Split Ends
  • High-Quality FT061PS Ø6.1 mm Stainless Steel Tubing with Black Plastic Sheath
Item # Wavelength
Range
Fiber
Item #
# of
Fibers
Core
Diameter
Cladding
Diameter
Coating
Diameter
NAb Min Bend Radius
(Short Term /
Long Term)
Common
End Face
Drawing
Connector
Material
FC/PC Connectors with 2.0 mm Narrow Key
BFY200HF2 300 - 1200 nm FT200UMT 2 200 ± 5 µm 225 ± 5 µm 500 ± 30 µm 0.39 ± 0.02 19c / 19 mmc FC/PC
Ceramic
BFY400HF2 300 - 1200 nm FT400UMT 2 400 ± 8 µm 425 ± 10 µm 730 ± 30 µm 0.39 ± 0.02 20e / 40 mme FC/PC
Mixedd
SMA Connectors
BFY50HS02 250 - 1200 nma FG050UGA 2 50 µm ± 2% 125 ± 1 µm 250 µm ± 4% 0.22 ± 0.02 19c / 30 mmd SMA905
Stainless
Steel
BFY105HS02 250 - 1200 nma FG105UCA 2 105 µm ± 2% 125 ± 1 µm 250 µm ± 4% 0.22 ± 0.02 19c / 30 mmd
BFY200HS02 300 - 1200 nm FT200UMT 2 200 ± 5 µm 225 ± 5 µm 500 ± 30 µm 0.39 ± 0.02 19c / 19 mmc
BFY400HS02 300 - 1200 nm FT400UMT 2 400 ± 8 µm 425 ± 10 µm 730 ± 30 µm 0.39 ± 0.02 20e / 40 mme
BFY600HS02 300 - 1200 nm FT600UMT 2 600 ± 10 µm 630 ± 10 µm 1040 ± 30 µm 0.39 ± 0.02 30e / 60 mme
BFY1000HS02 300 - 1200 nm FT1000UMT 2f 1000 ± 15 µm 1035 ± 15 µm 1400 ± 50 µm 0.39 ± 0.02 50e / 100 mme f
  • Solarization may occur over time when used below 300 nm. Please contact Tech Support to inquire about custom bundles made with solarization-resistant fibers.
  • The NA of the bundle is the same as that of the individual fibers.
  • Limited by the plastic-sheathed stainless steel tubing.
  • Common connector ferrule is stainless steel, while connector ferrules on split ends are ceramic.
  • Limited by the optical fiber.
  • There are two dark fibers that help align the active fibers in the common leg during manufacturing.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
BFY200HF2 Support Documentation
BFY200HF2Bifurcated Fiber Bundle, Ø200 µm, High OH, FC/PC, 2 m
$333.10
Today
BFY400HF2 Support Documentation
BFY400HF2Bifurcated Fiber Bundle, Ø400 µm, High OH, FC/PC, 2 m
$334.75
Today
BFY50HS02 Support Documentation
BFY50HS02Customer Inspired! Bifurcated Fiber Bundle, Ø50 µm, High OH, SMA905, 2 m
$375.49
Today
BFY105HS02 Support Documentation
BFY105HS02Customer Inspired! Bifurcated Fiber Bundle, Ø105 µm, High OH, SMA905, 2 m
$354.63
Today
BFY200HS02 Support Documentation
BFY200HS02Customer Inspired! Bifurcated Fiber Bundle, Ø200 µm, High OH, SMA905, 2 m
$348.96
Today
BFY400HS02 Support Documentation
BFY400HS02Customer Inspired! Bifurcated Fiber Bundle, Ø400 µm, High OH, SMA905, 2 m
$347.11
Today
BFY600HS02 Support Documentation
BFY600HS02Bifurcated Fiber Bundle, Ø600 µm, High OH, SMA905, 2 m
$369.56
Today
BFY1000HS02 Support Documentation
BFY1000HS02Bifurcated Fiber Bundle, Ø1000 µm, High OH, SMA905, 2 m
$397.99
Today

Low OH Fiber Bundles, SMA905

  • 400 - 2200 nm or 400 - 2400 nm Wavelength Range (See Table Below)
  • SMA905 Connectors Terminate All Ends
  • 2 m Total Length from Common End to Split Ends
  • High-Quality FT061PS Ø6.1 mm Stainless Steel Tubing with Black Plastic Sheath
Item # Wavelength
Range
Fiber
Item #
# of
Fibers
Core
Diameter
Cladding
Diameter
Coating
Diameter
NAa Min Bend Radius
(Short Term /
Long Term)
Common
End Face
Drawing
Connector
Material
SMA Connectors
BFY50LS02 400 - 2400 nm FG050LGA 2 50 µm ± 2% 125 ± 1 µm 250 µm ± 4% 0.22 ± 0.02 19b / 30 mmc SMA905
Stainless
Steel
BFY105LS02 400 - 2400 nm FG105LCA 2 105 µm ± 2% 125 ± 1 µm 250 µm ± 4% 0.22 ± 0.02 19b / 30 mmc
BFY200LS02 400 - 2200 nm FT200EMT 2 200 ± 5 µm 225 ± 5 µm 500 ± 30 µm 0.39 ± 0.02 19b / 19 mmb
BFY400LS02 400 - 2200 nm FT400EMT 2 400 ± 8 µm 425 ± 10 µm 730 ± 30 µm 0.39 ± 0.02 20c / 40 mmc
BFY600LS02 400 - 2200 nm FT600EMT 2 600 ± 10 µm 630 ± 10 µm 1040 ± 30 µm 0.39 ± 0.02 30c / 60 mmc
BFY1000LS02 400 - 2200 nm FT1000EMT 2d 1000 ± 15 µm 1035 ± 15 µm 1400 ± 50 µm 0.39 ± 0.02 50c / 100 mmc d
  • The NA of the bundle is the same as that of the individual fibers.
  • Limited by the plastic-sheathed stainless steel tubing.
  • Limited by the optical fiber.
  • There are two dark fibers that help align the active fibers in the common leg during manufacturing.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
BFY50LS02 Support Documentation
BFY50LS02Customer Inspired! Bifurcated Fiber Bundle, Ø50 µm, Low OH, SMA905, 2 m
$375.49
Today
BFY105LS02 Support Documentation
BFY105LS02Customer Inspired! Bifurcated Fiber Bundle, Ø105 µm, Low OH, SMA905, 2 m
$353.50
Today
BFY200LS02 Support Documentation
BFY200LS02Customer Inspired! Bifurcated Fiber Bundle, Ø200 µm, Low OH, SMA905, 2 m
$348.96
Today
BFY400LS02 Support Documentation
BFY400LS02Customer Inspired! Bifurcated Fiber Bundle, Ø400 µm, Low OH, SMA905, 2 m
$347.11
Today
BFY600LS02 Support Documentation
BFY600LS02Bifurcated Fiber Bundle, Ø600 µm, Low OH, SMA905, 2 m
$371.93
Today
BFY1000LS02 Support Documentation
BFY1000LS02Bifurcated Fiber Bundle, Ø1000 µm, Low OH, SMA905, 2 m
$397.99
Today

Mixed Fiber Bundles (One High OH and One Low OH), SMA905

  • 300 - 1200 nm for High OH Leg and 400 - 2200 nm for Low OH Leg
  • SMA905 Connectors Terminate All Ends
  • 2 m Total Length from Common End to Split Ends
  • High-Quality FT061PS Ø6.1 mm Stainless Steel Tubing with Black Plastic Sheath
Item # Wavelength
Range
Fiber
Item #
# of
Fibers
Core
Diameter
Cladding
Diameter
Coating
Diameter
NAa Min Bend Radius
(Short Term /
Long Term)
Common
End Face
Drawing
Connector
Material
SMA Connectors
BFY200MS02 300 - 1200 nm FT200UMT 1 200 ± 5 µm 225 ± 5 µm 500 ± 30 µm 0.39 ± 0.02 19b / 19 mmb SMA905
Stainless
Steel
400 - 2200 nm FT200EMT 1
BFY400MS02 300 - 1200 nm FT400UMT 1 400 ± 8 µm 425 ± 10 µm 730 ± 30 µm 0.39 ± 0.02 20c / 40 mmc
400 - 2200 nm FT400EMT 1
  • The NA of the bundle is the same as that of the individual fibers.
  • Limited by the plastic-sheathed stainless steel tubing.
  • Limited by the optical fiber.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
BFY200MS02 Support Documentation
BFY200MS02Customer Inspired! Bifurcated Fiber Bundle, Ø200 µm, Mixed, SMA905, 2 m
$366.01
Today
BFY400MS02 Support Documentation
BFY400MS02Customer Inspired! Bifurcated Fiber Bundle, Ø400 µm, Mixed, SMA905, 2 m
$366.01
Today

ZrF4 SMA905 Fiber Bundles (285 nm - 4.5 µm), SMA905

Zirconium Fluoride Cables
Click for Details

ZrF4 fiber bundles are labeled with their Item #, key specs, and batch number.
  • Broadband 285 nm - 4.5 µm Wavelength Range 
  • SMA905 Connectors Terminate All Ends
  • 0.5 m Total Length from Common End to Split Ends
  • BFYZ4S05: High-Quality Ø3.8 mm Stainless Steel Tubing
  • BFYZ6S05: High-Quality FT080SS Ø8.0 mm Stainless Steel Tubing
Item # Wavelength
Range
Fiber # of
Fibers
Core
Diameter
Cladding
Diameter
Coating
Diameter
NAa Min Bend Radius
(Short Term /
Long Term)
Common
End Face
Drawing
Connector
Material
SMA Connectors
BFYZ4S05 285 nm - 4.5 µm ZrF4
Multimode
2 450 ± 15 µm 540 ± 15 µm 650 ± 25 µm 0.20 ± 0.02
@ 2.0 µm
50b / 125 mmc SMA905
Stainless
Steel
BFYZ6S05 600 ± 20 µm 690 ± 20 µm 770 ± 30 µm 140b / 160 mmc
  • The NA of the bundle is the same as that of the individual fibers.
  • Limited by the stainless steel tubing.
  • Limited by the optical fiber.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
BFYZ4S05 Support Documentation
BFYZ4S05Customer Inspired! Bifurcated Fiber Bundle, Ø450 µm, ZrF4, SMA905, 0.5 m
$1,181.93
Today
BFYZ6S05 Support Documentation
BFYZ6S05Customer Inspired! Bifurcated Fiber Bundle, Ø600 µm, ZrF4, SMA905, 0.5 m
$1,461.38
Today

Fiber Bundle Adapters for OSL2 and Former OSL1 Fiber Light Source

Collimation and Focusing Packages
Click for Details

OSL2 with an SM1SMA Adapter and Multimode Fiber Bundle
  • Connect Fiber Bundles to our Fiber Light Source
  • SM1SMA and SM1FC Compatible with our Current OSL2 Light Source
    • SM1SMA Allows SMA Terminated Bundles to be the Output of our OSL2
    • SM1FC Allows FC/PC Terminated Bundles to be the Output of our OSL2
  • OSL1-SMA Allows SMA Terminated Bundles to be the Output of our Former OSL1 Light Source

Thorlabs' SM1SMA and SM1FC Fiber Connector Adapters allow SMA and FC/PC terminated fiber bundles, respectively, to be the output of our OSL2 Fiber Light Source. Our OSL1-SMA adapter allows for SMA terminated fiber bundles to be the output of our former OSL1 Fiber Light Source. Our fiber bundles with SMA and FC/PC connectors offer broader operating wavelength ranges than the fiber bundle included with the former OSL1 and the current OSL2YFB bifurcated fuber bundle, and they are available in longer lengths.

The SM1SMA and SM1FC adapter plates can be attached to the front SM1-threaded (1.035"-40) output port of the OSL2 light source. The fiber bundle adapter that comes preinstalled on the OSL2 must first be removed by unscrewing it from the output port before attaching the SM1SMA or SM1FC. The OSL1-SMA adapter inserts into the front panel of the former OSL1 unit and is secured by a thumbscrew. Note that the OSL1-SMA is not compatible with the OSL2 light source.

Note: The OSL1-SMA is not compatible with our current OSL2 Light Source.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SM1SMA Support Documentation
SM1SMASMA Fiber Adapter Plate with External SM1 (1.035"-40) Threads
$30.47
Today
SM1FC Support Documentation
SM1FCFC/PC Fiber Adapter Plate with External SM1 (1.035"-40) Threads
$30.47
Today
OSL1-SMA Support Documentation
OSL1-SMASMA Fiber Bundle Adapter for OSL1 Fiber Light Source
$32.31
5-8 Days
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