Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1996-09-04
1998-01-06
Moskowitz, Nelson
Optical: systems and elements
Optical amplifier
Optical fiber
359160, 359345, H04B 1016, H01S 3131
Patent
active
057061262
ABSTRACT:
A second optical branching coupler and a second light sensor are additionally provided at the output side of the optical amplifier, in addition to a first optical branching filter for branching part of the light outputted from the optical amplifier and a first light sensor for measurement of the level of the branching light. Provided between the first light sensor and the second light sensor is a band-pass filter which allows passage of only light with specific wavelengths, for measurement of the level of the light with specific wavelengths. The difference between the levels of the outputted light measured by the first light sensor and the light with specific wavelengths measured by the second light sensor is calculated by a subtracting process to control the gain of the optical amplifier on the basis of the result of the subtracting process. The band-pass filter is provided for removal of amplified spontaneous emission from the optical output. The band-pass filter allows only the amplified spontaneous emission to pass. Since the feedback is controlled free from the influence of the amplified spontaneous emission, a constant optical output is maintained with high precision.
REFERENCES:
patent: 5117196 (1992-05-01), Epworth et al.
patent: 5343320 (1994-08-01), Anderson
patent: 5471334 (1995-11-01), Masuda et al.
patent: 5506724 (1996-04-01), Shimizu et al.
patent: 5510926 (1996-04-01), Boyart et al.
patent: 5600481 (1997-02-01), Nababayashi
Firngibl, M; Electronics Letters; vol. 27, #7, pp. 560-561, Mar. 28, 1991.
Deservire, B; Physics Today, pp. 20-27, Jan. 1994.
Moskowitz Nelson
NEC Corporation
LandOfFree
Optical amplifier does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical amplifier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical amplifier will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2334149