Optical transmission device using a wide input dynamic range...

Details Optical transmission device using a wide input dynamic range... Optical transmission device using a wide input dynamic range...

2007-07-24

2007-07-24

Pascal, Leslie (Department: 2613)

Optical communications

Optical repeater system

Specific optical elements

C398S026000, C398S037000, C398S177000, C359S349000

Reexamination Certificate

active

10892241

ABSTRACT:
Conventionally, an adjustment of an optical power level of an input Pin of an optical amplifier module is made with an optical variable attenuator. An optical coupler for measuring the optical power level of Pin and an optical variable attenuator are replaced by a variable optical coupler. The branch ratio of the variable optical coupler is varied, whereby the input optical power level Pin to an optical amplifier module is adjusted. As a result, an optical loss is reduced by an amount corresponding to the elimination of the optical attenuator, and also the OSNR of the optical amplifier module is improved.

REFERENCES:
patent: 5875054 (1999-02-01), Onoda et al.
patent: 6434286 (2002-08-01), Hayashi et al.
patent: 1 049 274 (2000-11-01), None
patent: 2000-312185 (2000-11-01), None
patent: 2001-339344 (2001-12-01), None

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