Patent ID: 6697414
Filing Date: 2004-02-24
Classification: G02B,H01S,H04J

Abstract:
A light emitting apparatus for an optical communication system having a bit error rate (BER) that is less than a predetermined value, said light emitting apparatus comprising:a light generating portion for generating an optical signal having said bit error rate (BER), said light generating portion including a semiconductor optical amplifier and a grating fiber, said semiconductor optical amplifier having a light emitting surface and a light reflecting surface, said grating fiber having an optical waveguide and a grating provided in said optical waveguide, said optical waveguide having a first end portion and a second end portion, said first end portion being optically coupled to said light emitting surface of said semiconductor optical amplifier; and an optical isolator provided between said light generating portion and an output port of the light emitting apparatus, and optically coupled to said second end portion of said grating fiber, said optical isolator having an isolation value not less than âˆ’52.4âˆ’8.7Ã—log(BER) in dB at a transmission rate not more than 2.5 Gbps in a predetermined optical communication band to enable said light generating portion to generate said optical signal.