Optical: systems and elements – Optical amplifier – Correction of deleterious effects
Patent
1999-01-22
2000-12-12
Moskowitz, Nelson
Optical: systems and elements
Optical amplifier
Correction of deleterious effects
359134, 359174, 359341, G01J 328, H04B 1008, H01S 300
Patent
active
061606596
ABSTRACT:
An apparatus which receives an input light having a spectrum, and determines a momental wavelength of the spectrum. The apparatus includes a decoupling unit, a weighting unit and a computation unit. The decoupling unit decouples a portion of the received input light, to provide a first signal representing the input light with the portion decoupled therefrom, and a second signal representing the decoupled portion. The weighting unit weights the second signal. The computation unit determines the momental wavelength from the power of the first signal and the power of the weighted second signal. An optical amplifier is also provided which determines the momental wavelength of an amplified light, and controls a gain tilt parameter of the optical amplifier in accordance with the determined momental wavelength, to reduce gain tilt. An optical communication system is also provided which includes a plurality of such optical amplifiers sequentially arranged along an optical transmission line.
REFERENCES:
patent: 5050949 (1991-09-01), DiGiovanni et al.
patent: 5140456 (1992-08-01), Huber
patent: 5177634 (1993-01-01), Way
patent: 5185826 (1993-02-01), Delavaux
patent: 5218608 (1993-06-01), Aoki
patent: 5225922 (1993-07-01), Chraplyvy et al.
patent: 5239607 (1993-08-01), da Silva et al.
patent: 5280383 (1994-01-01), Federici et al.
patent: 5287216 (1994-02-01), Chirravuri et al.
patent: 5406404 (1995-04-01), DiGiovanni et al.
patent: 5430572 (1995-07-01), DiGiovanni et al.
patent: 5436760 (1995-07-01), Nakabayashi
patent: 5497264 (1996-03-01), Bayart et al.
patent: 5506724 (1996-04-01), Shimizu et al.
patent: 5510926 (1996-04-01), Bayart et al.
patent: 5537244 (1996-07-01), Fukushima et al.
patent: 5539563 (1996-07-01), Park
patent: 5541766 (1996-07-01), Mizrahi et al.
patent: 5664131 (1997-09-01), Sugiya
patent: 5721635 (1998-02-01), Shigematsu et al.
patent: 5764404 (1998-06-01), Yamane et al.
patent: 5805322 (1998-09-01), Tomofuji
patent: 5812710 (1998-09-01), Sugaya
S.F. Su et al., "Gain Equalization in Multiwavelength Lightwave Systems Using Acoustooptic Tunable Filters" IEEE Photonics Technology Letters, vol. 4, No. 3, Mar. 1992.
H. Miyata et al., "Dispersion Compensation Design for 10-Gb/s 16-Wave WDM Transmission System Over Standard Single-Mode Fiber" Technical Report of IEICE, OCS95-34 (Jul. 1995) (Translation of Abstract).
Y. Nakabayashi et al., "Er:Doped Fiber Amplifier for WDM Transmission Using Fiber Gain Control" Technical Report of IEICE, OCS94-66, OPE94-89 (Nov. 1994) (Translation of Abstract).
M. Suyama et al., "2.5 Gb/s, 4 Channel WDM Transmission Over 1060 km Using EDFAs With Suppressed Gain Bandwidth Narrowing", OAA '93, pp. 126-129.
V.L. da Silva et al., "Automatic Gain Flattening in Er-Doped-Fiber Amplifiers" OFC/IOOC '93 Technical Digest, pp. 174-175.
T. Sugawa et al., "Optical Amplification in Er.sup.3+ -Doped Single-Mode Fluoride Fiber" IEEE Photonics Technology Letters, vol. 2, No. 7, Jul. 1990.
M. Shigematsu et al., "120 Channel AM-VSB Signal Transmission by 2 Wavelength Multiplexing Through Gain Flattened Hybrid Erbium-Doped Fiber Amplifier" OAA '95, ThB3-1, pp. 13-16.
S. Yoshida et al., "Common Amplification Characteristics of EDFA With High Aluminium Concentration For Wavelength-Division-Multiplexed Signal" Technical Report of IEICE, CS95-43, OCS95-9 (Jun. 1995). (Translation at Abstract Only).
T. Kashiwada et al. "Special Gain Behavior of Er-Doped Fiber With Extremely High Aluminum Concentration" OAA '93, pp. 104-107.
Hiroo Kanamori; "Optical Components and Fiber Technologies for Erbium-Doped Fiber Amplifier", Fourth Optoelectronics Conference (OEC '92) Technical Digest 1992.
M. Hamada et al.; "Characteristics of Fusion Splice of Er.sup.3+ -Doped Fiber for Optical Amplifier", Fourth Optoelectronics Conference (OEC '92) Technical Digest 1992.
C. R. Giles et al.; "Dynamic Gain Equalization in Two-Stage Fiber Amplifiers";Optical Amplifiers and Their Applications; Technical Digest 1990, Series vol. 13, MD2 48-51.
T. Kakinuma et al.; "Gain and Noise Characteristics of Er-Doped Fiber Amplifiers With Different Pumping Directions"; Optical Amplifiers and Their Applications; Technical Digest 1990, Series vol. 13, TuB1 126-129.
M. Yoshida et al.; "Development of Compact Characteristic of Er.sup.3+ -Doped Fiber Amplifiers for Practical Applications"; Optical Amplifiers and Their Applications; Technical Digest 1990, Series vol. 13; WDI 281-285.
K. Suzuki et al.; "High-Gain Erbium-Doped Fiber Amplifier Pumped by 820 nm GaAIAs Laser Diodes"; Optical Amplifiers and Their Applications; Technical Digest 1990, Series vol. 3, MB4 20-23.
B. Mikkelsen et al.; "High Receiver Sensitivity at 2.5 Gb/s Obtained With a Highly Efficient Low Noise Diode Pumped Erbium-Doped Fiber Amplifier"; Optical Amplifiers and Their Applications; Technical Digest 1991, Series vol. 13, FA4-1 192-FA4-4 1995.
H. Takenaka et al.; "Compact Size and High Output Power Er-Doped Fiber Amplifier Modules Pumped With 1.48.mu.m MQW LDs"; Optical Amplifiers and Their Applications; Technical Digest 1991, Series vol. 13, FD2-1 254-FD2-4 257.
A. Wada et al.; "High-Frequency Erbium-Doped Fiber Amplifiers Using Mode Field Diameter Adjusting Technique"; Optical Amplifiers and Their Applications; Technical Digest 1991, Series vol. 13, FD3-1 257-FD3-4 261.
D. Tanaka et al.; "73.6km Attenuation Free Concatenated Fibers Doped With Distributed Erbium"; Optical Amplifiers and Their Applications; Technical Digest 1991, Series vol. 13, ThD4-1 156-ThD4-4 159.
G. R. Jacobovitz-Veselka et al.; "Single-Stage Booster Amplifier With Two 980 nm Pumps Stabilized by Fiber Grating"; Optical Amplifiers and Their Applications; Technical Digest 1995, Series vol. 18; FC4-1 162-FC4-4 165.
Y. Tashiro et al.; "High Power Erbium-Doped Optical Fiber Amplifier"; The Institute of Electronics, information and Communication Engineers; Technical Report of IEICE, OCS95-86 (Oct. 1995), pp. 67-72 (including translation of Abstract only).
M. Shimizu et al.; "High Saturating Operation of 0.98 .mu.m Laser Diode Pumped Erbium-Doped Fiber Amplifiers"; The Institute of Electronics, Information and Communication Engineers; Proceedings of the 1991 IEICE Fall Conference, Tamagawa University, pp. 4-239. (English Language Translation of Section 2).
K. Oosono et al.; "Reliability Study of Er-Doped Optical Fiber"; The Institute of Electronics, Information and Communication Engineers; Proceedings of the 1992 IEICE Fall Conference, Tokyo Institute of Technology, pp. 4-282. (English language translation of Section 2 and Table 1).
K. Oosono et al.; "Study of High Output Power Er-Doped Fiber Amplifier"; The Institute of Electronics, Information and Communication Engineers; Proceedings of the 1992 IEICE Fall Conference, Tokyo Institute of Technology, pp. 4-283. (English language translation of Section 2).
K. Takano et al.; "An Optical Pre-Amplifier With Automatic Gain Control Function"; The Institute of Electronics, Information and Communication Engineers; Proceedings of the 1995 IEICE General Conference, Fukuoka Institute of Technology, pp. 513. (English language translation of Section 2).
Youichi Fukada, et al.;"Gain-Bandwidth and Noise-Figureue Measuring Technique on an Optical In-Line Amplifier"; Technical Report of IEICE; OCS94-69, OPE94-92 (Nov. 1994).
H. Toba, et al.; "A 100-Channel Optical FDM Transmission/Distribution at 622 Mb/s Over 50 km"; Journal of Lightwave Technology, vol. 8, No. 9, Sep. 1990; pp. 1396-1401.
J.M. P. Delavaux et al.; "Hybrid Er-Doped Fiber Amplifiers at 980-1480 nm for Long Distance Optical Communications"; Electronics Letters 13th Aug. 1992, vol. 28, No. 17.
S. G. Grubb et al.; "Ultrahigh Power Diode-Pumped 1.5-.mu.m Fiber Amplifiers"; OFC '96 Technical Digest Series, vol. 2; Feb. 25-Mar. 1, 1996.
Japanese Publication "Er:Doped Fiber Amplifer for WDM Transmission Using Fiber Gain Control", Technical Report of IEICE, OCS94-66, OPE94, Nov. 1994. (including English language translation of Abstract only).
Y. Sugaya et al., "Configuration Design of Multi-wavelength Er-doped Fiber Amplifier for WDM Transmission System" Technical Report of IEICE
Fujitsu Limited
Moskowitz Nelson
LandOfFree
Method and apparatus for monitoring the momental wavelength of l does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for monitoring the momental wavelength of l, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for monitoring the momental wavelength of l will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-223094