Optical: systems and elements – Optical amplifier
Patent
1990-06-19
1992-02-18
Moskowitz, Nelson
Optical: systems and elements
Optical amplifier
359484, H01S 310, G02B 530, G02B 628
Patent
active
050897861
ABSTRACT:
In an optical amplifier, light incident on a first port of a port separator is emitted out of a third port, and is input into and amplified in a semiconductor laser. Amplified light receives the first amount of rotation, e.g., a 45.degree. rotation, of the direction of polarization in a Faraday rotator assembly and is emitted outward. Light emitted out of the Faraday rotator assembly is reflected by the reflector. Passed through the Faraday rotator assembly backward, receives the second amount of rotation, e.g., a further 45.degree. rotation, of the direction of polarization in the same direction as the previous rotation, and is input into the semiconductor laser. The input light is amplified again in the semiconductor laser, is input in the third port of the port separator, and is emitted outward from a second port. The direction of polarization of light passing forward and backward through the semiconductor laser are orthogonal to each other, and therefore amplification will be done at a constant degree of amplification, regardless of the direction of polarization.
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Moskowitz Nelson
OKI Electric Industry Co., Ltd.
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