Patent ID: 7746547
Filing Date: 2010-06-29
Classification: H01S,H04B,H04J

Abstract:
1. A method for amplifying a CWDM optical signal having at least first and second frequency bands, the method comprising the steps of: amplifying the CWDM optical signal using at least one Raman pump coupled to the optical fiber cable, a gain of the at least one Raman pump increasing monotonically within each of said frequency bands; splitting the amplified CWDM optical signal into the at least two frequency bands; further amplifying at least one of the frequency bands using a semiconductor optical amplifier (SOA), a gain of the SOA decreasing monotonically within the amplified frequency range, a net gain of the SOA and the Raman amplifier within each frequency band being flatter than either one of the SOA gain and the Raman amplifier gain; and recombining the at least two frequency bands.