Optical: systems and elements – Optical amplifier – Correction of deleterious effects
Patent
1998-05-22
1999-10-05
Moskowitz, Nelson
Optical: systems and elements
Optical amplifier
Correction of deleterious effects
359161, 359177, 359341, G01J 328, H04B 1008, H01S 300
Patent
active
059633611
ABSTRACT:
An optical amplifier is disclosed having substantially uniform spectral gain. The amplifier comprises a variable optical attenuator coupled between first and second segments of active optical fiber. The attenuation of the optical attenuator is adjusted in accordance with the optical power input to the amplifier to thereby obtain substantially flattened gain. Alternatively, the attenuator can be controlled based on the respective gains associated with the first and second segments of optical fiber. For example, the attenuator can be adjusted so that so that the sum of the two gains remains substantially constant, a condition that also yields flat spectral gain. Further, optical powers associated with first and second wavelengths of amplified stimulated emission (ASE) light output from the amplifier can be used to adjust the attenuation of the optical attenuator. In an additional example, received optical powers associated with each of the channels in a WDM system are monitored and the attenuators within each amplifier in the system are controlled so that the received powers are substantially equal.
REFERENCES:
patent: 5115338 (1992-05-01), DiGiovanni et al.
patent: 5532864 (1996-07-01), Alexander et al.
patent: 5696615 (1997-12-01), Alexander
patent: 5812710 (1998-09-01), Sugaya
patent: 5818629 (1998-10-01), Kinoshita
Giles et al., "Dynamic Gain Equalization in Two-Stage Fiber Amplifiers", IEEE Photonics Technology Letters, vol. 2, No. 12, Dec. 1990, pp. 866-868.
Masuda et al., "Gain Monitoring of Erbium-Doped Fiber Amplifiers By Detecting Spontaneous Emmission", IEEE Photonic Technology Letters, vol. 5, No. 9, Sep. 1993, pp. 1017-1019.
Sugaya et al., "Novel Configuration For Low-Noise and Wide-Dynamic-Range Er-Doped Fiber Amplifier for WDM Systems", OAA'95, Jun. 1995, pp. 158-161.
Sridhar Balakrishnan
Taylor Michael G.
Ciena Corporation
Moskowitz Nelson
Soltz David L.
LandOfFree
Optical amplifier having a variable attenuator controlled based 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 having a variable attenuator controlled based , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical amplifier having a variable attenuator controlled based will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1178535