Patent ID: 7796894
Filing Date: 2010-09-14
Classification: H04B

Abstract:
1. An optical wavelength division multiplexing (WDM) communication system, comprising: a fiber transmission line that receives a plurality of WDM optical signals at different WDM wavelengths; an optical circulator having a first port coupled to the fiber transmission line to receive the WDM optical signals, a second port to output the received WDM optical signals and a third port to output light received at the second port; a WDM demultiplexer coupled to the second port of the optical circulator to separate WDM optical signals output by the second port into separated WDM optical signals along different optical paths; and a plurality of optical conditioning modules respectively coupled in the different optical paths, each optical conditioning module reconditioning a respective WDM optical signal and direct the reconditioned WDM optical signal back to the WDM demultiplexer which combines reconditioned WDM optical signals from the separate optical paths into the second port of the optical circulator which outputs the reconditioned WDM optical signals at the third port, each optical conditioning module comprising: