Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1996-09-12
1998-03-17
Pascal, Leslie
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359181, 359188, 359345, 359156, H04B 1004
Patent
active
057293724
ABSTRACT:
The invention provides an optical transmission method and apparatus suitable for use with a terminal station apparatus for an optical communication system for a very long distance of up to several thousands kilometers across an ocean as well as an optical amplification method and apparatus suitable for use with a repeater for an optical communication system. The methods and apparatus are improved in that the excessive loss in an optical amplifier and the variation of the branching ratio are suppressed to suppress the variation of the gain to suppress the polarization dependency of the loss or the gain on a transmission line of the optical communication system. The optical transmission apparatus comprises a depolarized light source for outputting depolarized light, and an external modulator for modulating light from the depolarized light source.
REFERENCES:
patent: 5113458 (1992-05-01), Taylor
patent: 5255274 (1993-10-01), Wysocki et al.
patent: 5311592 (1994-05-01), Udd
patent: 5337375 (1994-08-01), Nyman
patent: 5381230 (1995-01-01), Blake
Chikama Terumi
Naito Takao
Suyama Masuo
Terahara Takafumi
Fujitsu Limited
Pascal Leslie
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