Fiberoptic amplifier system with noise figure reduction

Details Fiberoptic amplifier system with noise figure reduction Fiberoptic amplifier system with noise figure reduction

1995-06-15

1997-06-03

Hellner, Mark

Optical: systems and elements

Optical amplifier

Optical fiber

359337, H01S 300

Patent

active

056360533

ABSTRACT:
A fiberoptic amplifier system having an optical amplifier, which receives an input signal and generates an amplified signal and amplified spontaneous emission noise, and a variable polarization beam splitter, which receives the amplified signal and amplified spontaneous emission noise from the optical amplifier. The amplified spontaneous emission (ASE) noise is a broadband optical noise with a random polarization state in a rare earth-doped fiber optical amplifier. In a semiconductor laser diode optical amplifier, the ASE noise is partially polarized depending upon the waveguide structure of the laser diode. In the rare earth-doped fiber optical amplifier noise figure reduction configuration, the variable polarization beam splitter is responsive to the polarization of the amplified input signal to split one-half of the amplified spontaneous emission noise away from the amplified input signal and remaining one-half of the amplified spontaneous emission noise into a first port and the amplified input signal and the remaining one-half of the amplified spontaneous emission noise passes to an output port. This significantly reduces the noise figure of the fiberoptic amplifier system.

REFERENCES:
patent: 5295015 (1994-03-01), Yoneyama
patent: 5303314 (1994-04-01), Duling, III et al.
patent: 5361161 (1994-11-01), Baney et al.
patent: 5471334 (1995-11-01), Masuda et al.
patent: 5526174 (1996-06-01), Saito

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