CWDM（Coarse Wavelength Division Multiplexing）: Usually, Specifies the wavelengths used in CWDM are from 1270nm to 1610nm, with a channel spacing of 20nm, and a total of 18 wavelengths CWDM passive devices.
In the field of CWDM optical passive device production, expensive test instruments account for a large part of the test cost, in which OSA, broadband light source is the most expensive part of the instrument, make full use of broadband light source, OSA, multi-station shared instrument resources is the main method to effectively reduce the total test cost.
PDL test --light source、Polarization controller、OPM(polarization insensitive)
Automated test system adopts computer server, time-sharing sharing mode, via USB or network communications, software control , multiple computers and instruments are organically combined to realize the control and sharing of single broadband light source and OSA instrument at multiple test stations, thus breaking through the limitations of traditional desktop instruments, achieving the purpose of sharing expensive resources and reducing test costs.
Product basic test diagram as below shows(1X4 CWDM module as an example)
SLED broadband light source as the test light source
Advantage: With wide spectral range, high spectral power density, high test efficiency and moderate cost, it is one of the ideal broadband light source solutions.
SLED broadband light source can cover the entire spectrum range of CWDM (cover 1270~1620 nm), the optical power density is 30db higher than the LED source, so the isolation of CWDM channels can be detected up to 50dB.