Optical line monitor and optical amplification apparatus using s

Details Optical line monitor and optical amplification apparatus using s Optical line monitor and optical amplification apparatus using s

1998-05-08

1999-10-26

Palmer, Phan T. H.

Optical waveguides

With optical coupler

Input/output coupler

385 24, 385 31, 359130, 359333, G02B 634

Patent

active

059742127

ABSTRACT:
A line monitor comprising: an optical signal input section for permitting an optical signal to be input; optical signal output means for outputting an optical signal; a fiber grating including a section with a periodically varied refractive index, the optical signal, which has entered the section with a periodically varied refractive index, in its component with a predetermined specific wavelength being reflected while the remaining component of the optical signal is output from the optical signal output means; first optical signal withdrawal means for allowing the optical signal in its component with a specific wavelength to withdraw into the outside of the fiber grating; and photoelectric conversion means for converting the optical signal in its component with a specific wavelength taken out from the first optical signal withdrawal means to an electric signal. The section with a periodically varied refractive index is provided so as to incline against the central axis of the fiber grating, and the optical signal in its component with a specific wavelength is radiated from the side face of the fiber grating to take out the optical signal in its component with a specific wavelength. A plurality of the fiber gratings and a plurality of the first optical signal withdrawal sections corresponding respectively to the fiber gratings may be provided. This constitution can realize a small-size line monitor with low coupling loss. An optical amplification apparatus using this line monitor is also disclosed.

REFERENCES:
patent: 5337382 (1994-08-01), Mizrahi
patent: 5778119 (1998-07-01), Farries
patent: 5796764 (1998-08-01), Corsini et al.

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