OP940-SW Multi-channel Optical Return Loss Meter

OP940-SW Multi-channel Optical Return Loss Meter

The fastest and most accurate multi-channel optical return loss meter in the industry!

OP940 Insertion Loss return loss power meter


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Accurately test your multiple simplex, or multi-channel fiber optic cable assemblies faster, easier and more efficiently with the OP940-SW Optical Return Loss Meter for both IL and RL.

The multichannel OP940 is an internally switched Insertion Loss (IL) and Return Loss (RL) meter designed for testing ribbon cables and multi-pin termini. Used worldwide by some of the largest companies, this system offers the fastest and most accurate multichannel optical return loss testing experience in the industry.

* OptoTest offers a variety of calibration services click here to learn more.

>> View OP940 Single Channel Version
>> View OP940 Bidirectional Version


Simplified Test Setup

The OP940 measures quickly and accurately without the need for mandrel wrapping or the use of index matching gel.

Fastest IL/RL Measurement

A single channel, dual wavelength, IL and RL test with the multichannel OP940 takes less than 4 seconds.

Most Accurate RL Measurement

By making use of a wide dynamic range (-10dB to -80dB) for RL measurements, the multichannel OP940 is able to adjust for attenuation in the reference setup, which results in the most accurate Return Loss results in the industry.

Easy Maintenance For Minimal Downtime

To minimize downtime on high volume production lines due to optical end-face damage, the removable front panel gives you access to the source connector, allowing you to re-polish the connector if it gets damaged.


With a variety of channel count options (4 port to 24 ports) the multichannel OP940-SW ORL meter is available with Single Mode, Multimode, and FTTX wavelengths and a variety of core sizes and detector options.  Industry-standard 19″ rackmount enclosure is standard on this instrument.


We proudly design & manufacture our equipment in California, United States.



  • Test up to 24 channel Multifiber & Ribbon Fiber Optic Cables in Seconds
  • Front Panel Optical Reflectance Trace for each Channel
  • Set Return Loss Reference Position and Value
  • Measure Optical Return Loss at Multiple Connection Points through the Front Panel
  • Produce All-In-One Cable Datasheet through Software
  • Programmable Pass/Fail
  • Available in Single Mode, Multimode, FTTX
  • On Screen Help
  • Easy to Use
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Automate, customize, and record your tests through software.

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Can be calibrated on-site, in-house or remotely.

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OptoTest offers a three-year full warranty!

Technical Support

Our team of experts is ready to assist you.

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Our 30-Day Guarantee allows a full refund for any reason.
*click for details

Talk to one of our sales engineers at +1(805) 987-1700 to learn more about our custom solutions.


Return Loss Single Mode FTTX Multimode
Source Wavelength 1310nm, 1550nm 1310nm, 1550nm, 1490nm, 1625nm 850nm, 1300nm
Measurement Range
-10dB to -80dB -10dB to -80dB -10dB to -58dB
Measurement Linearity ±1dB (-12dB to -72dB) ±1dB (-12dB to -72dB) ±1dB (-10dB to -45dB)
Distance Range up to 2500 meters
Mandrel-free minimum distance 1.7 meters (both reflections <-45dB)
Insertion Loss Single Mode FTTX Multimode
Source Center Wavelength ±30nm from nominal ±30nm from nominal ±30nm from nominal
Source Bandwidth <10nm <10nm <140nm (850nm) <200nm (1300nm)
Internal Fiber 9/125μm (SMF28) 9/125μm (SMF28) 50/125μm, 62.5/125μm, 105/125μm
Launch Condition N/A N/A Available upon request
Output Power* (typical) -1.5dBm -2.5dBm -18dBm(850nm) -20dBm(1300nm):
Insertion Loss Stability** ±0.02dB ±0.02dB ±0.02dB

Measurement Linearity (Relative Accuracy)***
Deviation ± 0.05dB 0dBm to -65dBm at 1490nm
Deviation ± 0.01dB <10dB power variation

*For single channel systems. **Over 1 hour with a max. change of 1ºC. ***For 1, 2, and 3mm detectors.

Measurement Timing Single Mode FTTX Multimode
IL and RL, Dual Wavelength 3s* 6s 3s*
Switching Time (Multichannel) 100ms

* Using the front panel in Dual ILRL mode or running OPL-Pro with real-time update enabled.

Mainframe OP940-SWs
Dimensions 16 ¾” x 3.5” x 14″
Power Supply 90VAC … 264VAC; 47Hz to 63Hz; 0.7Amps (115VAC) 0.4Amps (230VAC); Fuse: T1A, 250V
Warm-up time 5-15 minutes
Operating Temperature 5℃ to 40℃
Maximum Relative humidity* 80%

* For temperatures up to 31°C, decreasing linearly to 50% relative humidity at 40°C.


Advancing the World of Fiber Optics™