Patent ID: 6198572
Filing Date: 2001-03-06
Classification: H01S,H04B,H04J

Abstract:
An apparatus for amplifying an optical signal within a wavelength bandwidth, comprising:first means for maintaining flatness of gain within the wavelength bandwidth, the first means includinga first-stage optical amplifier which amplifies an input optical signal to thereby output a first-stage amplified optical signal, the first-stage amplified optical signal passing through a first optical isolator and then a second optical isolator, anda second-stage optical amplifier which receives the first-stage amplified optical signal after passing through the first and second optical isolators, and amplifies the received first-stage amplified optical signal; andsecond means for compensating for dispersion of the first-stage amplified optical signal after the first-stage amplified optical signal passes through the first optical isolator and before the first-stage amplified optical signal passes through the second optical isolator.