Patent ID: 6115403
Filing Date: 2000-09-05
Classification: H01S,H04B

Abstract:
An optical device, comprising:a semiconductor laser configured to be coupled to a first end portion of an optical communication path;a drive circuit coupled to said semiconductor laser, said drive circuit supplying an electrical signal to said semiconductor laser to hereby emit light in a directly modulated fashion;an optical receiver configured to be coupled to a second end portion of said optical communication path to thereby receive said light emitted by said semiconductor laser; andan in-line fiber Bragg grating provided in said optical communication path, said in-line fiber Bragg grating being provided in an in-transmission configuration with an optical output of said semiconductor laser, said in-line fiber Bragg grating being spaced a first distance from said first end portion of said optical communication path and a second distance from said second end portion of said optical communication path, said first distance being less than said second distance, said in-line fiber Bragg grating being configured to substantially reject chirp-induced frequencies of said light, and said in-line fiber Bragg grating has a transmissivity characteristic, said transmissivity characteristic having a first transmissivity over a first range of frequencies and a second transmissivity, greater than said first transmissivity, over a second range of frequencies, said first range of frequencies having a magnitude at least equal to 40 GHz.