Create an Account  |   Log In

View All »Matching Part Numbers


Your Shopping Cart is Empty
         

Variable Fiber Optical Attenuators, Polarization Maintaining


  • Polarization-Maintaining, Inline, Variable Fiber Optic Attenuators
  • Up to 50 dB Attenuation
  • 630, 780, 1064, or 1310/1550 nm Center Wavelength

Adjustment Screw
Located on Top

VOA780PM-FC

VOA50PM-APC

FC/APC

FC/PC

Related Items


Please Wait

Features

  • Bi-Directional, Inline, Variable Fiber Optical Attenuators
  • Collimator-Based Manually Variable Attenuation
  • 1 m Long PM Fiber Pigtail on Each Side

Thorlabs' Polarization-Maintaining Variable Optical Attenuators (PM VOAs) allow the user to manually vary the attenuation of a signal for precise power balancing in fiber circuits or evaluation of the dynamic range of measurement systems. Adjustment of the attenuation is achieved using the thumbscrew on the top of the housing.

The attenuator is comprised of an input fiber, collimating lens, blocking device, focusing lens, and output fiber. By turning the thumbscrew, the blocking device is shifted into the beam path, blocking part of the free-space beam (refer to the schematic to the right). Then, a second lens is used to couple light into the output fiber. Therefore, by turning the screw, one can manually alter the coupling efficiency until the desired attenuation is obtained.

All in-line PM VOAs have fiber pigtails with a Ø900 µm jacket and are available with 2.0 mm narrow key FC/PC- or FC/APC-connectorized fiber pigtails with the key aligned to the slow axis. For other connector styles or custom requests, please contact technical support.

Attenuation Range

Shown below is a sample attenuation curve obtained by testing the VOA780PM-APC. The device was tested with the adjustment screw in the closed position (blocking the light). The screw was then turned counterclockwise in quarter turns until the attenuation specification was met. PM VOAs with other center wavelengths exhibit similar performance. Please note: changes in turning direction may cause a small offset in attenuator position due to backlash.

PM VOA Attenuation by Turns
Click to Enlarge
Click for Raw Data


Posted Comments:
user  (posted 2018-01-30 10:26:40.157)
Please make 980nm version. Thanks!
tcampbell  (posted 2018-01-31 08:43:19.0)
Hello, thank you for contacting Thorlabs. I have posted this suggestion in our internal engineering forum. Feel free to email techsupport@thorlabs.com for help in finding a suitable solution for your application.

630 nm Polarization-Maintaining Variable Optical Attenuators: In-Line

Item # Operating
Wavelength
Attenuation
Range
Attenuation
Resolution
% Transmission
Range
Return
Loss
Max
Power
Insertion
Loss
VOA630PM-FC 630 ± 20 nm 3.0 - 50 dB 0.15 dB (Typical) 0.001 - 50.1% >40 dB 300 mW <3.0 dB
VOA630PM-APC
Item # Extinction
Ratio
Operating
Temperature
Storage
Temperature
Fiber Fiber
Length
Housing
Dimensions
VOA630PM-FC >16 dB 0 to 70 °C -40 to 85 °C SM63-PS-U25A 1 m Per Side 26 mm x 18 mm x 8 mm
VOA630PM-APC
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
VOA630PM-FC Support Documentation
VOA630PM-FCCustomer Inspired! PM Variable Attenuator, 630 ± 20 nm, 50 dB, FC/PC
$853.79
Today
VOA630PM-APC Support Documentation
VOA630PM-APCCustomer Inspired! PM Variable Attenuator, 630 ± 20 nm, 50 dB, FC/APC
$875.44
Today

780 nm Polarization-Maintaining Variable Optical Attenuators: In-Line

Item # Operating
Wavelength
Attenuation
Range
Attenuation
Resolution
% Transmission
Range
Return
Loss
Max
Power
Insertion
Loss
VOA780PM-FC 780 ± 20 nm 2.1 - 50 dB 0.15 dB (Typical) 0.001 - 61.7% >40 dB 300 mW <2.1 dB
VOA780PM-APC
Item # Extinction
Ratio
Operating
Temperature
Storage
Temperature
Fiber Fiber
Length
Housing
Dimensions
VOA780PM-FC >16 dB 0 to 70 °C -40 to 85 °C SM85-PS-U25A 1 m Per Side 26 mm x 18 mm x 8 mm
VOA780PM-APC
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
VOA780PM-FC Support Documentation
VOA780PM-FCCustomer Inspired! PM Variable Attenuator, 780 ± 20 nm, 50 dB, FC/PC
$781.29
5-8 Days
VOA780PM-APC Support Documentation
VOA780PM-APCCustomer Inspired! PM Variable Attenuator, 780 ± 20 nm, 50 dB, FC/APC
$802.94
Today

1064 nm Polarization-Maintaining Variable Optical Attenuators: In-Line

Item # Operating
Wavelength
Attenuation
Range
Attenuation
Resolution
% Transmission
Range
Return
Loss
Max
Power
Insertion
Loss
VOA1064PM-FC 1064 ± 20 nm 1.3 - 50 dB 0.15 dB (Typical) 0.001 - 74.1% >45 dB 300 mW <1.3 dB
VOA1064PM-APC
Item # Extinction
Ratio
Operating
Temperature
Storage
Temperature
Fiber Fiber
Length
Housing
Dimensions
VOA1064PM-FC >18 dB 0 to 70 °C -40 to 85 °C SM980PS-U25A 1 m Per Side 26 mm x 18 mm x 8 mm
VOA1064PM-APC
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
VOA1064PM-FC Support Documentation
VOA1064PM-FCCustomer Inspired! PM Variable Attenuator, 1064 ± 20 nm, 50 dB, FC/PC
$682.82
Today
VOA1064PM-APC Support Documentation
VOA1064PM-APCCustomer Inspired! PM Variable Attenuator, 1064 ± 20 nm, 50 dB, FC/APC
$705.54
Lead Time

Telecom (1310/1550 nm) Polarization-Maintaining, Variable Optical Attenuators: In-Line

Item # Operating
Wavelength
Attenuation
Range
Attenuation
Resolution
% Transmission
Range
Return
Loss
Max
Power
Insertion
Loss
VOA50PM-FC 1310 ± 40 nm and
1550 ± 40 nm
0.9 - 50 dB 0.15 dB (Typical) 0.001 - 81.3% 50 dB 300 mW <0.9 dB
VOA50PM-APC
Item # Extinction
Ratio
Operating
Temperature
Storage
Temperature
Fiber Fiber
Length
Housing
Dimensions
VOA50PM-FC >18 dB -5 to 70 °C -40 to 85 °C SM13-PS-U25D 1 m Per Side 26 mm x 18 mm x 8 mm
VOA50PM-APC
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
VOA50PM-FC Support Documentation
VOA50PM-FCCustomer Inspired! PM Variable Attenuator, 1310 & 1550 nm, 50 dB, FC/PC
$662.26
Today
VOA50PM-APC Support Documentation
VOA50PM-APCCustomer Inspired! PM Variable Attenuator, 1310 & 1550 nm, 50 dB, FC/APC
$684.98
Today
Log In  |   My Account  |   Contact Us  |   Careers  |   Privacy Policy  |   Home  |   FAQ  |   Site Index
Regional Websites: West Coast US | Europe | Asia | China | Japan
Copyright © 1999-2020 Thorlabs, Inc.
Sales: 1-973-300-3000
Technical Support: 1-973-300-3000


High Quality Thorlabs Logo 1000px:Save this Image