Patent ID: 6341033
Filing Date: 2002-01-22
Classification: G01J,H01S,H04B

Abstract:
An optical amplifier comprising:multiple gain stages arranged serially for providing gain for an optical signal propagating therein, each gain stage comprising a pumped segment of optical waveguide, wherein said optical signals are at least in the 1530 nm to 1560 nm range; first gain flattening filter reducing a variation in gain of said optical amplifier in a particular wavelength band, and a second gain flattening filter reducing a variation in gain of said optical amplifier, wherein one of said gain stages is located between said first gain flattening filter and said second gain flattening filter, such that no additional gain flattening filter is located directly adjacent to the first or the second gain flattening filter, wherein said multiple gain stages include a first gain stage G1 that provides high gain of at least 15 dB.