Bidirectionally transmittable optical wavelength division...

Details Bidirectionally transmittable optical wavelength division... Bidirectionally transmittable optical wavelength division...

2005-09-06

2005-09-06

Sedighian, M. R. (Department: 2633)

Optical communications

Multiplex

Wavelength division or frequency division

C398S037000, C398S097000, C398S157000, C398S160000, C398S173000, C359S341200, C359S341300

Reexamination Certificate

active

06941074

ABSTRACT:
Different bands (C-band and L-band) are allotted respectively to an upstream optical signal and a downstream optical signal. In a transmission-path optical fiber for Raman amplification, the C-band optical signal is amplified by pumping light from a C-band pumping light source, and the L-band optical signal is amplified by pumping light from an L-band pumping light source. As a result of this configuration, the optical signals are Raman-amplified through backward pumping in both upstream and downstream directions, whereby negative effects, which could be exerted on the optical signals by forward pumping, can be avoided.

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European Search Report dated Feb. 4, 2004 for corresponding EP Application No. 01105407.

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