Create an Account  |   Log In

View All »Matching Part Numbers

Your Shopping Cart is Empty

Fiber Isolators for Broadband SLDs

  • Flat Isolation Over a 100 nm and 150 nm Wavelength Range
  • Wavelength Ranges Covering 790 to 970 nm
  • Ideally Suited for Use with SLDs


Connectors Available Upon Request

Related Items

Please Wait
Selection Guide for Isolators
Fiber Isolators
Spectral Region Wavelength Range Fiber Type
Visible 650 - 670 nm SM
NIR 770 - 1060 nm SM
Nd:YAG 1064 nm SM
IR 1290 - 2010 nm SM
Fiber Isolators for Broadband SLDs
Free-Space Isolators
Custom Isolators
Custom Isolators
  • Customizable Wavelength, Aperture, Max Power, Housing, Polarizers, and Operating Temperature
  • Pricing Similar to Stock Units
  • Wide Range of OEM Capabilities
  • Please Contact Tech Support or See Our Custom Isolators Page


  • Flat Isolation over a 100 nm and 150 nm Wavelength Range
  • Ideally Suited for Use with SLDs
  • Unterminated Fiber Pigtails, Connectors Available by Contacting Tech Support
  • Polarization-Independent Design

Fiber isolators protect light sources from back reflections and signals that can cause instabilities and damage. They are designed to block light traveling into the source while allowing light to exit the source with minimal loss. The IO-F-SLD Series Polarization-Independent Broadband Fiber Isolators are specifically designed for use with superluminescent diodes (SLDs) such as our SLD Series. Typical fiber isolators have a narrow isolating wavelength range with a peak isolation of about 33 dB. These isolators are designed for flat isolation over a broad wavelength range of either 100 nm or 150 nm depending on the model but have a lower isolation of 23 to 32 dB (see the graph below). This makes them an ideal choice for broad-spectrum devices like SLDs. These polarization-independent models are designed for use with CW light sources only and come with 780HP single mode fiber with unterminated fiber ends.

Item #IO-F-SLD100-840IO-F-SLD150-895
Wavelength 840 ± 50 nm 895 ± 75 nm
Max Powera,b 2 W (CW)
Isolationc ≥25 dB ≥23 dB
Performance Graph
(Click for Plot)
Click to View Click to View
Insertion Loss ≤1.6 dB ≤2.1 dB
PDL ≤0.25 dB
Return Loss ≥52 dB
Fiber 780HP
  • Specified power rating is for the isolator. Proper laser termination is critical. Not recommended for high-power pulsed applications.
  • The maximum power specification represents the maximum power for the combined forward and reverse directions. Therefore, the sum of the powers in the forward and reverse directions cannot exceed the maximum power specification.
  • Isolation varies with wavelength; see the Performance Graphs for details. Isolation is also temperature dependent.
Broadband Isolator vs Typical Isolator
Optical Isolator in FiberBench Mount
Click to Enlarge

Custom Isolator Example
Custom Adjustable Narrowband Isolator with Different Input and Output Polarizers Optimized for 650 nm Wavelength and 40 °C Temperature.
OEM Application Services
  • Direct Integration to Laser Head Assemblies
  • Combination Isolator and Fiber Coupling Units
  • Minimum Footprint Packages
  • Filter Integration
  • Active Temperature Control and Monitoring
  • Feedback Monitoring
  • Environmental Qualification
  • Private Labeling
  • ITAR-Compliant Assembly

OEM and Non-Standard Isolators

In an effort to provide the best possible service to our customers, Thorlabs has made a commitment to ship our most popular free-space and fiber isolator models from stock. We currently offer same-day shipping on more than 90 isolator models. In addition to these stock models, non-stock isolators with differing aperture sizes, wavelength ranges, package sizes, and polarizers are available. In addition, we can create isolators tuned for specific operating temperatures and isolators that incorporate thermistors with heating or cooling elements for active temperature control and monitoring. These generally have the same price as a similar stock unit. If you would like a quote on a non-stock isolator, please fill out the form below and a member of our staff will be in contact with you.

Thorlabs has many years of experience working with OEM, government, and research customers, allowing us to tailor your isolator to specific design requirements. In addition to customizing our isolators (see the OEM Application Services list to the right), we also offer various application services.


Wavelength Range From 244 - 4550 nma
Aperture Sizes  Up to Ø15 mm
Polarization Dependence Dependent or Independent
Max Powerb Up to 2 GW/cm²
Isolation Up to 60 dB (Tandem Units)
Operating Temperature 10 - 70 °C
  • Custom Faraday rotators, for use in the 244 to 5000 nm range, are also available.
  • The maximum power specification represents the maximum power for the combined forward and reverse directions. Therefore, the sum of the powers in the forward and reverse directions cannot exceed the maximum power specification.

Free-Space Isolators

We are able to provide a wide range of flexibility in manufacturing non-stock, free-space isolators. Almost any selection of specifications from our standard product line can be combined to suit a particular need. The table to the right shows the range of specifications that we can meet.

We offer isolators suitable for both narrowband and broadband applications. The size of the housing is very dependent on the desired maximum power and aperture size, so please include a note in the quote form below if you have special requirements.


Faraday Rotators

We can also offer Faraday rotators which rotate the polarization of incoming light by 45° ± 3°. These are similar to our isolators but with the polarizers at each end removed. They are available with center wavelengths from 244 to 5000 nm.


Wavelength Range From 633 - 2050 nma
Polarization Dependence Dependent or Independent
Max Powerb (Fiber to Free-Space) 30 W
Max Powerb (Fiber to Fiber) 20 W
Operating Temperature 10 - 70 °C
  • For wavelengths shorter than 633 nm, we recommend using our free-space isolators in conjunction with our modular FiberBench accessories. Please contact Technical Support for more information.
  • The maximum power specification represents the maximum power for the combined forward and reverse directions. Therefore, the sum of the powers in the forward and reverse directions cannot exceed the maximum power specification.

Fiber Isolators

Thorlabs is uniquely positioned to draw on experience in classical optics, fiber coupling, and isolators to provide flexible designs for a wide range of fiber optic specifications. Current design efforts are focused on increasing the Maximum power of our fiber isolators at and near the 1064 nm wavelength. We offer models with integrated ASE filters and taps. The table to the right highlights the range of specifications that we can meet.

The fiber used is often the limiting factor in determining the Maximum power the isolator can handle. We have experience working with single mode (SM) and polarization-maintaining fibers (PM); single-, double- and triple-clad fibers; and specialty fibers like 10-to-30 µm LMA fibers and PM LMA fibers. For more information about the fiber options available with our custom isolators, please see the expandable tables below.

In the spectral region below 633 nm, we recommend mounting one of our free-space isolators in a FiberBench system. A FiberBench system consists of pre-designed modules that make it easy to use free-space optical elements with a fiber optic system while maintaining excellent coupling efficiency. Upon request, we can provide select stock isolators in an optic mount with twin steel dowel pins for our FiberBench systems, as shown to the left.

We are also in the process of extending our fiber isolator capabilities down into the visible region. For more information, please contact Technical Support.

Custom Fiber Isolator
Custom Free-Space Isolator for Wavelengths Below 633 nm
Optical Isolator in FiberBench Mount
Click to Enlarge

Twin Steel Pins Insert into FiberBench
Optical Isolator in FiberBench Mount
Click to Enlarge

Mounted Isolator
Polarization Independent Fiber
Polarization Maintaining Fiber


Make to Order Options

The expandable tables below provide information on some common isolator and rotator specials we have manufactured in the past. We keep the majority of the components for these custom isolators in stock to ensure quick builds, so these specials are available with an average lead time of only 2-4 weeks.  Please use the Non-Stock Isolator Worksheet below for a quote.

Adjustable Narrowband Isolators
Faraday Rotators
Fixed Narrowband Isolators
Fixed Broadband Isolators


Custom Request Form

Request a custom isolator quote using the form below or by contacting us for more information at (973) 300-3000.

Non-Stock Isolator Worksheet:
Please select your input type:   Free-Space Input   |   Fiber Input
Is this an ITAR request?:   Yes No     Not sure?
Close [X]

ITAR (International Traffic in Arms Regulation) is a United States Government regulation controlling the import and export of defense-related articles on the United States Munitions List (USML). Information and material pertaining to military and defense related technology may only be shared with U.S. Persons unless authorization from the Department of State is received or a special exemption is used.
Free-Space Input
Wavelength or Wavelength Range (nm):
Power (W):
Max 1/e2 Beam Diameter (mm):
Isolation (dB):
% Transmission:
Fiber Input
Wavelength or Wavelength Range (nm):
Power (W):
Polarization Sensitivity:Dependent  |  Independent
Isolation (dB):
% Transmission:
Fiber Connector: FC/PC   |  FC/APC  |  Other
Output: Fiber   |  Free-Space

Customer Information:
First Name:
Last Name:
Zip/Postal Code:
Security Code:  
Please click here if you cannot read the security image
This code is to prevent automated spamming of our website.   Thank you for your understanding.
Required Fields

Documents Tab to be Discontinued...
Please note that this tab will be removed at the end of 2015. The same information displayed here can be found by clicking on the red Docs Icon (Support Documentation icon) next to the item of interest in the pricing area below.
Click the Support Documentation icon document icon or Part Number below to view the available support documentation
Part NumberProduct Description
IO-F-SLD100-840 Support Documentation IO-F-SLD100-840:Fiber Isolator for Broadband SLDs, 790 - 890 nm, 2 W, Pol Ind.
IO-F-SLD150-895 Support Documentation IO-F-SLD150-895:Fiber Isolator for Broadband SLDs, 820 - 970 nm, 2 W, Pol Ind., No Connectors

Please Give Us Your Feedback
Email Feedback On
Contact Me:
Your email address will NOT be displayed.
Please type the following key into the field to submit this form:
Click Here if you can not read the security code.
This code is to prevent automated spamming of our site
Thank you for your understanding.
Would this product be useful to you?   Little Use  1234Very Useful

Enter Comments Below:
Characters remaining  8000   
Posted Comments:
Posted Date:2015-07-30 04:04:45.0
Single mode angle polished AR coated fiber are used on the inputs and outputs. The standard angle is 8 degrees. Small AR coated aspheric lenses are used as the collimating and coupling lenses.
Posted Date:2015-06-08 19:27:51.443
What kind of fiber collimator is used for coupling in and out in these isolators? Do they have AR-coating? Is the fiber end cleaved at an angle? Thanks.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
IO-F-SLD100-840 Support Documentation
IO-F-SLD100-840Customer Inspired!Fiber Isolator for Broadband SLDs, 790 - 890 nm, 2 W, Pol Ind.
IO-F-SLD150-895 Support Documentation
IO-F-SLD150-895Customer Inspired!Fiber Isolator for Broadband SLDs, 820 - 970 nm, 2 W, Pol Ind., No Connectors
Log In  |   My Account  |   Contact Us  |   Careers  |   Privacy Policy  |   Home  |   FAQ  |   Site Index
Regional Websites:East Coast US | West Coast US | Europe | Asia | China | Japan
Copyright 1999-2015 Thorlabs, Inc.
Sales: 1-973-300-3000
Technical Support: 1-973-300-3000

High Quality Thorlabs Logo 1000px:Save this Image