Balanced optical amplifier

Details Balanced optical amplifier Balanced optical amplifier

1992-09-15

1993-10-12

Moskowitz, Nelson

Optical: systems and elements

Optical amplifier

Optical fiber

359174, H01S 300, G02B 626

Patent

active

052531040

ABSTRACT:
A balanced doped fiber optical amplifier is disclosed which requires only a single wavelength division multiplexer to provide pump and signal inputs to multiple amplifier stages. In particular, a first section of doped fiber is coupled to an "input" port of the multiplexer and a second section of doped fiber is coupled to an "output" port of the multiplexer. First and second pump signals are coupled to the remaining ports to provide a counter-propagating pump signal to the first doped fiber section and a co-propagating pump signal to the second doped fiber section. The parameters of each doped fiber section (e.g., length, dopant concentration, pump power, pump wavelength) may be individually tailored to provide the desired results (pre-amplification or power boosting, for example). A plurality of balanced optical amplifiers may be cascaded to provide multi-stage amplifiers, and the pump signal levels may be controlled to provide gain equalization. Preferably, the balanced amplifier is spliceless and comprises only two sections of doped fiber, the multiplexer formed as a coupling region between the fibers.

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