Multimode Round Fiber Optic Bundle Cables: SMA to SMA

  • Multimode Fiber Bundles
  • Round-to-Round Configuration
  • Incoherent: No Mapping
  • SMA905 Connectors


Stainless Steel Tubing

Connector Face


Features a
Ø1.3 mm 19 Fiber Bundle


Features a
Ø2.0 mm 7 Fiber Bundle



Related Items

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Aperture Ø1.3 mm Ø2.0 mm
Wavelength Range 400 - 2200 nm 250 - 1200 nm 400 - 2200 nm 250 - 1200 nm
NAa 0.22
# of Fibers 19 7
Core Diameter 200 ± 8 µm 550 ± 19 µm
Cladding Diameter 240 ± 5 µm 600 ± 10 µm
Effective Core Diameter 1126 µm 1750 µm
Fiber Attenuation Plot
Short-Term Bend Radiusb 26 mm 48 mm
Long-Term Bend Radiusb 52 mm 96 mm
Usable Area 46% 56%
Length Tolerance +0.075 m / -0 m
Maximum Temperature 80 °C
  • The NA of the bundle is the same as that of the individual fibers.
  • Limited by the Fiber
Typical Applications
  • Spectroscopy
  • Fluorescence Microscopy Emission Collection
  • Particle Detection Scanning
  • Colorimetry
  • Illumination


  • 1 or 2 m Long Bundles of 7 or 19
    Multimode Fibers
  • SMA905 Connectors on Both Ends
  • High-OH and Low-OH Versions
  • No Broken Fibers
  • Custom Versions Available

Thorlabs’ line of high-quality fiber optical bundles consists of either 7 or 19 high-grade optical fibers in a round configuration combined in an SMA905 connector. Versions are available with either low-OH or high-OH fibers. Fibers with Ø200 μm cores are used in the bundles of 19 fibers and feature a Ø1.3 mm bundle aperture. In contrast, fibers with Ø550 μm cores are used in the bundles of 7 fibers and feature a Ø2.0 mm bundle aperture. The Ø1.3 mm fiber bundle has a smaller bend radius than the Ø2.0 mm bundle. However, the Ø2.0 mm bundle has a larger diameter allowing more light to travel along it. These fiber bundles are primarily designed for coupling to light sources and therefore the fibers are not in the same orientation at each end, and each item may have some variation in the relative position of the fibers in the connector. For increased durability, these cables incorporate stainless steel protective tubing (FT05SS).

Each patch cable includes two protective caps that shield the connector ends from dust and other hazards. Additional CAPM Rubber Fiber Caps and CAPSM Metal Threaded Fiber Caps for SMA-terminated ends are also sold separately.

Custom fiber bundles are available upon request. We can also make custom bifurcated fiber bundles, where one common connector is split into two or more connectors. Please contact Tech Support.

Fan Out Cable
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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
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Custom Silica Fiber Bundle with SMA905 Connectors
Custom Bundle Capabilities
Straighta Fan Out (2 or More Legs)a,b
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
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
  • 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 with your custom bundle requests.
Please provide a drawing or draft of your custom bundle to expedite quote processing.

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
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Undamaged Fiber End
Power Handling Limitations Imposed by Optical Fiber
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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
(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), undoped 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 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)

Effective Area of Multimode Fibers
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

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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.

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:
user  (posted 2023-03-16 14:38:07.88)
Hey, i am a master student from JGU- university of mainz. For my master thesis I use the multimode fiber bundle from Thor laps. I want to couple light from a 532nm laser into the fiber with the highest efficiency and homogeneity possible. Even though the fiber is not an imaging fiber I want to use this as one reordering the fibers in the analysis. I have glued a diamond at the end of the fiber to collect the 637 nm fluorescence back and view the PL on a camera. For this I want to illuminate the individual fibers as homogeneous as possible whereby a 1/e^2 in difference is acceptable. I try to manage this task with different lenses but the result is not that great. So I want to use the right collimator/coupler for this fiber and task but I am not sure which one suits the best. At the moment I would prefer the zoom fiber collimator. but it would be great If you can give my some input. Best regards Maximilian Hilker
jgreschler  (posted 2023-03-16 04:13:02.0)
Thank you for reaching out to Thorlabs. When using fiber bundles one of the primary challenges is how to get even illumination over all the bundled fibers, one way to approach this is to employ Z axis control using a SM1ZA or similar item to translate the bundle through the focusing plane to an even distribution point. I have reached out to you directly to discuss the specifics of your application and make recommendations to optimize your setup.
jbierwa  (posted 2014-03-18 10:43:04.01)
Dear Thorlabs Team, I was wondering if it would be possible to have a Multimode Round Fiber Optic Bundle Cables such as the BF20 in which the central fiber splits to have a Y-Bundle, similar to the BFY400-Bundle. Many Thanks in advance
pbui  (posted 2014-03-20 02:23:50.0)
Yes, we should be able to provide a custom Y-Bundle similar to the BF20 cables. We will contact you to discuss your exact requirements.
nm3fd  (posted 2014-03-05 10:10:43.333)
Hi can i use this fiber bundle for both excitation and collection of fluorescence signal ? will be be affect the scan beam through the fiber ? Thanks Nirmal UVa
pbui  (posted 2014-03-05 03:25:22.0)
It seems you're looking for a coherent fiber bundle for such an application. You would not be able to use these fiber bundles since they are not designed to be coherent. You might also need a bifurcated cable for such an application. We will contact you directly to discuss your specific requirements and to provide a quote for a custom cable.
tcohen  (posted 2012-10-25 09:31:00.0)
Response from Tim at Thorlabs to Baisheng: We can configure a custom bundle with no jacket for exposing the branched fibers. I will contact you to discuss the details of your custom.
a0021822  (posted 2012-10-22 03:58:00.05)
Hi! I would like to order fiber bundles for sensor application, but I want to expose all the branch fibers between two SMA connectors. I was wondering if it is possible to strip fiber coatings of the bundle in order to expose all branched fibers. Thanks. Regards, Baisheng
sharrell  (posted 2012-09-06 09:36:00.0)
Response from Sean at Thorlabs: Thank you for your feedback! We will endeavor to get a better photo of the fiber bundle end faces, however, there is some variation in the location of the fibers from bundle to bundle, and so your bundle may appear different than our photo. If you have a photo of your bundle, I would be interested in seeing it and will email you to continue the conversation. Also, our fiber bundles are primarily designed for coupling to light sources, and therefore there is no mapping of fiber from end-to-end. You can, however, map a bundle yourself by launching light into each fiber and noting which fiber lights up on the other end.
james.david.good  (posted 2012-09-06 04:28:47.0)
A better image of the layout of the BF13 would be nice, as the it cannot be clearly seen in the photo. I could send you one myself. The outer row is rotated relative to the inner. Also, it is possible to map the fibre and use it as a very low-resolution imaging bundle. I've done it!
jlow  (posted 2012-07-31 19:44:00.0)
A response from Jeremy at Thorlabs: Thank you very much for your feedback. I have forwarded your idea to our fiber group and we will look into the possibility of offering that as a standard product.
user  (posted 2012-07-29 12:06:43.0)
Would be good to have splitting / combining fiber bundles, like: 10 fibers going to one connector, and other 10 going to another connector, or other combinations. For example, this offers a simple way to use a single detector / DAQ channel to probe two (or more) light channels, alternatively or together, as controlled elsewhere.

Fiber Bundles: SMA to SMA

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
BF13LSMA01 Support Documentation
BF13LSMA01Round Fiber Bundle, Ø1.3 mm, Low OH, SMA to SMA, 1 m
Lead Time
BF13LSMA02 Support Documentation
BF13LSMA02Round Fiber Bundle, Ø1.3 mm, Low OH, SMA to SMA, 2 m
BF13HSMA01 Support Documentation
BF13HSMA01Round Fiber Bundle, Ø1.3 mm, High OH, SMA to SMA, 1 m
7-10 Days
BF13HSMA02 Support Documentation
BF13HSMA02Round Fiber Bundle, Ø1.3 mm, High OH, SMA to SMA, 2 m
BF20LSMA01 Support Documentation
BF20LSMA01Round Fiber Bundle, Ø2.0 mm, Low OH, SMA to SMA, 1 m
BF20LSMA02 Support Documentation
BF20LSMA02Round Fiber Bundle, Ø2.0 mm, Low OH, SMA to SMA, 2 m
BF20HSMA01 Support Documentation
BF20HSMA01Round Fiber Bundle, Ø2.0 mm, High OH, SMA to SMA, 1 m
BF20HSMA02 Support Documentation
BF20HSMA02Round Fiber Bundle, Ø2.0 mm, High OH, SMA to SMA, 2 m

SMA Fiber Bundle Adapter for the Former OSL1 Fiber Light Source

OSL1-SMA Adapter
Click to Enlarge

SMA Fiber Bundle Attached to OSL1-SMA Adapter

The OSL1-SMA fiber bundle adapter allows multimode fiber bundles with SMA connectors to be used as the output of our former OSL1 fiber light source. Our fiber bundles with SMA connectors offer broader operating wavelength ranges than the fiber bundle included with the former OSL1 and the OSL2YFB bifurcated fiber bundle (sold above), and they are available in longer lengths.

The OSL1-SMA adapter inserts into the front panel of the former OSL1 unit and is secured by a thumbscrew. It is compatible with SMA905- and SMA906-style connectors.

Note: The OSL1-SMA is not compatible with our current OSL2 or OSL2IR light sources.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
OSL1-SMA Support Documentation
OSL1-SMASMA Fiber Bundle Adapter for OSL1 Fiber Light Source