Optical amplifiers, optical communication systems networks using

Details Optical amplifiers, optical communication systems networks using Optical amplifiers, optical communication systems networks using

1991-05-31

1993-06-29

Hellner, Mark

Optical: systems and elements

Optical amplifier

Correction of deleterious effects

359344, G02B 626

Patent

active

052239721

ABSTRACT:
In an optical amplifying apparatus of this invention, there are provided an optical amplifier part for giving a gain to an input light from outside and a selective loss part for giving a light loss of a prescribed ratio for different polarization modes in order to compensate for a polarization dependency of the amplification factor between the input and output lights. Thus, the difference of amplification factors for the different polarization modes is compensated for, as a whole of the apparatus. This polarization non-dependent type optical amplifying apparatus has solved the polarization dependency without degrading other characteristics, so that this can be preferably used in a optical communication system or network. Further, this amplifying apparatus does not require so many external optical components, so this is suitable to the fabrication of a module and is preferably contained in an integrated optical node.

REFERENCES:
patent: 3467906 (1969-09-01), Cornely et al.
patent: 4952017 (1990-08-01), Henry et al.
8030 Electronics Letters, vol. 25, No. 25, Dec. 7, 1989, S. Ryu et al. "FSK Coherent Transmission Experiment Through 10 Cascaded Semiconductor Laser Amplifiers".

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