Search Menu
Photonics Media Photonics Buyers' Guide Photonics Spectra BioPhotonics EuroPhotonics Vision Spectra Photonics Showcase Photonics ProdSpec Photonics Handbook

MPB Communications Inc.

Facebook Twitter LinkedIn Email Comments
Super Raman Fiber Laser

MPB Communications's Super Raman Fiber LaserThe Super Raman Fiber Laser from Montreal-based MPB Communications Inc. is a pump source that provides distributed Raman amplification in transmission spans of telecommunications systems via third-order cascaded Raman pumping. Third-order cascaded Raman amplification of C-band signals requires launching high power at 1276 nm, the third-order pump wavelength, and low seed powers at about 1356 and 1455 nm, the intermediate and final pump wavelengths.

The 1276-nm power produces high Raman gain for the 1356-nm seed radiation, leading to the generation of high power at 1356 nm. Similarly, the 1455-nm seed power is amplified by the Raman gain produced by the 1356-nm power. With each cascade, the peak power at the converted wavelength occurs farther out in the span; thus, cascaded pumping improves the amplifier noise figure.

At the heart of each Super Raman module is a Raman fiber laser that consists of an Yb-doped double-clad fiber laser and a phosphorous-doped-fiber Raman converter. The large phosphorous Raman shift allows the 1093-nm Yb laser output to be converted to the desired third-order Raman pump wavelength in a single conversion.

To provide seed powers at the intermediate and final wavelengths, high-reflectivity fiber gratings at 1356 and 1455 nm carry the 1276-nm pump power out of the span. The transmission fiber acts as a double-pass amplifier for the spontaneous Raman emission at each wavelength, with the feedback at the far end provided by a distributed Rayleigh scattering mirror.

Photonics Spectra
Jan 2003
cascaded Raman pumpingCommunicationsdistributed Raman amplificationFeaturespump sourcetelecommunications systems

back to top
Facebook Twitter Instagram LinkedIn YouTube RSS
©2020 Photonics Media, 100 West St., Pittsfield, MA, 01201 USA, [email protected]

Photonics Media, Laurin Publishing
x Subscribe to Photonics Spectra magazine - FREE!
We use cookies to improve user experience and analyze our website traffic as stated in our Privacy Policy. By using this website, you agree to the use of cookies unless you have disabled them.