Patent
Gain and signal level adjustments of cascaded optical amplifiers
| العنوان: | Gain and signal level adjustments of cascaded optical amplifiers |
|---|---|
| Patent Number: | 8,547,629 |
| تاريخ النشر: | October 01, 2013 |
| Appl. No: | 13/042737 |
| Application Filed: | March 08, 2011 |
| مستخلص: | An optical amplification device which includes first and second optical amplifiers, and a controller. The first optical amplifier receives a light and amplifies the received light. The second optical amplifier receives the light amplified by the first optical amplifier, and amplifies the received light. When a level of the light received by the first optical amplifier changes by Δ, the controller controls a level of the light received by the second optical amplifier to change by approximately −Δ. In various embodiments, the controller causes the sum of the gains of the first and second optical amplifiers to be constant. In other embodiments, the optical amplification device includes first and second optical amplifier and a gain adjustor. The gain adjustor detects a deviation in gain of the first optical amplifier from a target gain, and adjusts the gain of the second optical amplifier to compensate for the detected deviation. |
| Inventors: | Inagaki, Shinya (Kawasaki, JP); Shukunami, Norifumi (Sapporo, JP); Kinoshita, Susumu (Kawasaki, JP); Itou, Hiroyuki (Sapporo, JP); Kobayashi, Taiki (Kawasaki, JP) |
| Assignees: | Fujitsu Limited (Kawasaki, JP) |
| Claim: | 1. An apparatus comprising: optical amplifiers optically coupled together, each optical amplifier configured to have a gain; and detectors configured to detect a light, wherein the optical amplifiers are optically coupled between the detectors, a sum of the gains of the optical amplifiers, based on the detected light of the detectors, is constant. |
| Claim: | 2. The apparatus as in claim 1 , further comprising: a variable attenuator optically coupled between the optical amplifiers, wherein the variable attenuator is controlled based on a total gain of the apparatus. |
| Claim: | 3. An apparatus comprising: a first optical amplifier configured to have a first gain; a second optical amplifier optically coupled to the first optical amplifier, the second optical amplifier configured to have a second gain; a first detector configured to detect a power of an input light in the first optical amplifier; a second detector configured to detect a power of an output light in the first optical amplifier; a third detector configured to detect a power of an input light in the second optical amplifier; and a fourth detector configured to detect a power of an output light in the second optical amplifier, wherein a sum of the first gain and the second gain, based on output of the first detector, the second detector, the third detector, and the fourth detector, is constant. |
| Claim: | 4. The apparatus as in claim 3 , further comprising: a variable attenuator optically coupled between the first optical amplifier and the second optical amplifier, wherein the variable attenuator is controlled based on a total gain of the apparatus. |
| Claim: | 5. The apparatus as in claim 1 , further comprising: a variable attenuator optically coupled to the optical amplifiers, wherein the variable attenuator is controlled based on a total gain of the apparatus. |
| Claim: | 6. The apparatus as in claim 1 , wherein each optical amplifier is optically coupled between the detectors. |
| Claim: | 7. The apparatus as in claim 3 , further comprising: a variable attenuator optically coupled to the first optical amplifier and the second optical amplifier, wherein the variable attenuator is controlled based on a total gain of the apparatus. |
| Claim: | 8. An apparatus comprising: optical amplifiers optically coupled together, each optical amplifier configured to have a gain; and wherein a sum of the gains of the optical amplifiers is constant. |
| Current U.S. Class: | 359/337 |
| Patent References Cited: | 1871649 August 1932 Ball 3557347 January 1971 Robertson 3825336 July 1974 Reynolds 4176908 December 1979 Wagner 4292512 September 1981 Miller et al. 4364639 December 1982 Sinclair et al. 4644145 February 1987 Gundner 5050949 September 1991 DiGiovanni et al. 5083874 January 1992 Aida et al. 5140456 August 1992 Huber 5177634 January 1993 Way 5185826 February 1993 Delavaux 5218608 June 1993 Aoki 5225922 July 1993 Chraplyvy et al. 5239607 August 1993 da Silva et al. 5253104 October 1993 Delavaux 5260823 November 1993 Payne et al. 5280383 January 1994 Federici et al. 5287216 February 1994 Chirravuri et al. 5361319 November 1994 Antos et al. 5406404 April 1995 DiGiovanni et al. 5430572 July 1995 DiGiovanni et al. 5436760 July 1995 Nakabayashi 5448582 September 1995 Lawandy 5457811 October 1995 Lemson 5497264 March 1996 Bayart et al. 5502589 March 1996 Yamamoto 5504609 April 1996 Alexander et al. 5506724 April 1996 Shimizu et al. 5510926 April 1996 Bayart et al. 5521753 May 1996 Fake et al. 5532870 July 1996 Shigematsu et al. 5537244 July 1996 Fukushima et al. 5539563 July 1996 Park 5541766 July 1996 Mizrahi et al. 5563731 October 1996 Asahi 5568310 October 1996 Naito 5664131 September 1997 Sugiya 5673142 September 1997 Fatehi et al. 5675432 October 1997 Kosaka 5745276 April 1998 Ho et al. 5764404 June 1998 Yamane et al. 5801858 September 1998 Roberts et al. 5808789 September 1998 Edagawa et al. 5812710 September 1998 Sugaya 5818629 October 1998 Kinoshita 5867300 February 1999 Onaka et al. 5900782 May 1999 Igarashi et al. 5900969 May 1999 Srivastava et al. 5909305 June 1999 Kinoshita 5966237 October 1999 Sugaya et al. 5995274 November 1999 Sugaya et al. 6023366 February 2000 Kinoshita 6025947 February 2000 Sugaya et al. 6055092 April 2000 Sugaya et al. 6094296 July 2000 Kosaka 6118576 September 2000 Sugiya et al. 6134047 October 2000 Flood et al. 6144485 November 2000 Sugaya et al. 6157481 December 2000 Sugaya et al. 6198572 March 2001 Sugaya et al. 6288836 September 2001 Kawasaki et al. 6313706 November 2001 Kakuta et al. 6369938 April 2002 Sugaya et al. 6388527 May 2002 Kakuta et al. 6400499 June 2002 Sugaya et al. 6421169 July 2002 Bonnedal et al. 6476679 November 2002 Kakuta et al. 6480329 November 2002 Sugaya et al. 6483632 November 2002 Jolley et al. 6483633 November 2002 Onishi et al. 6501335 December 2002 Kakuta et al. 6603596 August 2003 Inagaki et al. 7061666 June 2006 Inagaki et al. 7224517 May 2007 Sugaya et al. 7474459 January 2009 Sugaya et al. 7924499 April 2011 Inagaki et al. 2001/0043121 November 2001 Kakuta et al. 2001/0052821 December 2001 Kakuta et al. 2002/0005761 January 2002 Kakuta et al. 1176529 March 1998 19716878 November 1997 0 463 771 January 1992 0 439 867 June 1994 0 695 050 January 1996 0805571 November 1997 0805571 November 1997 0920122 June 1999 1120871 August 2001 2747808 April 1997 2 244 595 December 1991 2312575 October 1997 2 314 714 January 1998 3-44206 February 1991 3-206427 September 1991 4-3028 January 1992 4-3029 January 1992 4-96287 March 1992 4-149525 May 1992 4-275530 October 1992 4-356984 December 1992 5-48207 February 1993 5-63259 March 1993 5-107573 April 1993 5-241209 September 1993 5-291676 November 1993 6-112567 April 1994 7-154338 June 1995 7-202306 August 1995 7-212315 August 1995 7-281219 October 1995 8-110535 April 1996 8-248455 September 1996 9-159526 June 1997 9-211507 August 1997 9-246879 September 1997 9-289348 November 1997 9-289424 November 1997 9-321701 December 1997 10-065650 March 1998 10-144984 May 1998 11-122192 April 1999 11-220336 August 1999 11-233866 August 1999 2001-168427 June 2001 WO 95/26061 September 1995 |
| Other References: | Extended European Search Report dated Mar. 21, 2012 issued in related European Patent Application No. 10161971.6. cited by applicant Extended European Search Report dated Mar. 21, 2012 issued in related European Patent Application No. 10161972.4. cited by applicant S. Kinoshita et al., “Wide-Dynamic-Range WDM Optical Fiber Amplifiers for 32×10 Gb/s, SMF Transmission Systems” OAA '98, Jul. 27-29, Vail, Colorado. cited by applicant Y. Sun, et al., “Transmission of 32-WDM 10-Gb/s Channels Over 640 km Using Broad-Band, Gain-Flattened Erbium-Doped Silica Fiber Amplifiers” IEEE Photonics Technology Letters, vol. 9, No. 12, Dec. 1997. cited by applicant Sugaya, Y., et al., “Novel configuration for low-noise and wide-dynamic-range ER-doped fiber amplifier for WDM systems,” Optical Amplifiers and Their Applications, Jun. 15-17, 1995, Davos, Switzerland, 1995 Technical Digest Series, vol. 18, pp. 158-161. cited by applicant Sugaya, Y., et al., “Experimental Investigation for the Designing of EDFA in WDM Transmission System,” (with EnglishTranslation) Proceedings of the 1995 IEICE General Conference, Mar. 27-30, 1995. cited by applicant Sugaya, Y., et al., “Configuration Design of Multi-wavelength Er-doped Fiber Amplifier for WDM Transmission System,” (with EnglishTranslation) The Institute of Electronics, Information and Communication Engineers, Technical Report of IEICE, OCS95-36 (Jul. 1995), pp. 21-27. cited by applicant Patent Abstracts of Japan, Publication No. 10065650, vol. 1998, No. 08, Jun. 30, 1998. cited by applicant Jolley et al., “Out-of-Band Electronic Gain Clamping for a Variable Gain and Output Power EDFA with Low Dynamic Gain”, OFC '97 Technical Digest, Feb. 16, 1997, pp. 134-135. cited by applicant Desurvire, “Erbium-Doped Fiber Amplifiers, Principles and Applications”, John Wiley & Sons, Preface and pp. 1-770, 1994. cited by applicant Sugaya, et al., “Configuration Design of Multi-wavelength Er-doped Fiber Amplifier for WDM Transmission System”, The Institute of Electronics, Information and Communication Engineers, Technical Report of IEICE, OCS95-36 (Jul. 1995), pp. 21-26 (with English translation). cited by applicant K. Ogata, “Modern Control Engineering”, Prentice-Hall Inc. 1970, pp. 4-6. cited by applicant John J. D'Azzo, et al., “Feedback Control System Analysis & Synthesis”, Second Edition, International Student Edition, McGraw Hill Kogakusha, Ltd., pp. 528-531 (not dated). cited by applicant S. Kinoshita, et al., “Low-Noise and Wide Dynamic-Range Erbium-Doped Fiber Amplifiers with Automatic Level Control for WDM Transmission Systems”, OSA Tops on Optical Amplifiers and Their Applications, vol. 5, 1996 OAA Program Committee (eds.) pp. 49-51. cited by applicant C. Koester, et al., “Amplification in a Fiber Laser”, Applied Optics, vol. 3, No. 10, pp. 1182-1186, Oct. 1964. cited by applicant M. A. Karr, et al., “Output Power Stability of GaAlAs Laser Transmitters Using an Optical Tap for Feedback Control,” Applied Optics, vol. 18, No. 8, pp. 1262-1265, Apr. 15, 1979. cited by applicant K. Inoue, et al., “Tunable Gain Equalization Using a Mach-Zehnder Optical Filter in Multistage Fiber Amplifiers”, IEEE Photonics Technology Letters, vol. 3, No. 8, pp. 718-720, Aug. 1991. cited by applicant Y. Tamura, et al., “A Travelling-Wave Optical Amplifier Module”, Oki Electric Industry Co., Ltd., pp. 491-494. cited by applicant N. E. Jolley, et al. “Out-of-band Electronic Gain Clamping for a Variable Gain and Output Power EDFA with Low Dynamic Gain Tilt”, OFC '97 Technical Digest, pp. 134-135. cited by applicant M. Nishimura, et al., “Gain-flattened Erbium-Doped Fiber Amplifiers for WDM Transmission”, OFC '97 Technical Digest, p. 127. cited by applicant Hiroo Kanamori; “Optical Components and Fiber Technologies for Erbium-Doped Fiber Amplifier”, Fourth Optoelectronics Conference (OEC '92) Technical Digest 1992. cited by applicant M. Hamada et al.; “Characteristics of Fusion Splice of Er3+-Doped Fiber for Optical Amplifier”, Fourth Optoelectronics Conference (OEC '92) Technical Digest 1992. cited by applicant 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. cited by applicant 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. cited by applicant M. Yoshida et al.; “Development of Compact Characteristic of Er3+-Doped Fiber Amplifiers for Practical Applications”; Optical Amplifiers and Their Applications; Technical Digest 1990, Series vol. 13; WDI 281-285. cited by applicant K. Suzuki et al.; “High-Gain Erbium-Doped Fiber Amplifier Pumped by 820 nm GaAlAs Laser Diodes”; Optical Amplifiers and Their Applications; Technical Digest 1990, Series vol. 13, MB4 20-23. cited by applicant 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-FA4-4 195. cited by applicant H. Takenaka et al.; “Compact Size and High Output Power Er-Doped Fiber Amplifier Modules Pumped With 1.48 μm MQW LDs”; Optical Amplifiers and Their Applications; Technical Digest 1991, Series vol. 13, FD2-1 254-FD2-4 257. cited by applicant A. Wada et al.; “High-Efficiency 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. cited by applicant 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. cited by applicant 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. cited by applicant 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 (with English Abstract). cited by applicant M. Shimizu et al.; “High Saturating Operation of 0.98 μm Laser Diode Pumped Erbium-Doped Fiber Amplifiers”; The Institute of Electronics, Information and Communication Engineers; Proceedings of the 1991 IEICE Fall Conference, Tamagawa University, p. 4-239. (English Language Translation of Section 2). cited by applicant 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, p. 4-282. (English language translation of Section 2 and Table 1). cited by applicant 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, p. 4-283. (English language translation of Section 2). cited by applicant 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, p. 513. (English language translation of Section 2). cited by applicant 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) (English Abstract). cited by applicant H. Toba, et al.; AA 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. cited by applicant J.M. P. Delavaux et al.; “Hybrid Er-Doped Fiber Amplifiers At 980-1480 nm for Long Distance Optical Communications”; Electronics Letters Aug. 13, 1992, vol. 28, No. 17. cited by applicant S. G. Grubb et al.; “Ultrahigh Power Diode-Pumped 1.5-μm Fiber Amplifiers”; OFC '96 Technical Digest Series, vol. 2; Feb. 25-Mar. 1, 1996. cited by applicant Y. Sugaya et al., “Experimental Investigation for the Designing of EDFA in WDM Transmission System” Proceedings of the 1995 IEICE General Conference B-1098 published on Mar. 10, 1995 (with complete English translation). cited by applicant 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). cited by applicant Sugaya et al., “Novel configuration for low-noise and wide-dynamic-range Er-doped fiber amplifier for WDM systems,” OAA '95 paper FC3, Jun. 16, 1995, 4 pages. cited by applicant Y. Sugaya et al., “Configuration Design of Multi-wavelength Er-doped Fiber Amplifier for WDM Transmission System” Technical Report of IEICE OCS95-36, published on Jul. 26, 1995. (with complete translation). cited by applicant Y. Sugaya et al., “Novel Configuration for Low-Noise and Wide-Dynamic-Range Er-Doped Fiber Amplifier for WDM Systems” OAA '95, FC3 (1995). cited by applicant 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. cited by applicant H. Toba et al., “A 100-Channel Optical FDM Six-Stage In-Line Amplifier System Employing Tunable Gain Equalizers” IEEE Photonics Technology Letters, vol. 5, No. 2, Feb. 1993. cited by applicant 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). cited by applicant 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). cited by applicant 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. cited by applicant V.L. da Silva et al., “Automatic Gain Flattening in Er-Doped-Fiber Amplifiers” OFC/IOOC '93 Technical Digest, pp. 174-175. cited by applicant T. Sugawa et al., “Optical Amplification in Er3+-Doped Single-Mode Fluoride Fiber” IEEE Photonics Technology Letters, vol. 2, No. 7, Jul. 1990. cited by applicant 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. cited by applicant C. R. Giles et al., “Dynamic Gain Equalization in Two-Stage Fiber Amplifiers”, IEEE Photonics Technology Letters, vol. 2, No. 12, Dec. 1990. cited by applicant 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) (with English Abstract). cited by applicant T. Kashiwada et al. “Spectral Gain Behavior of Er-Doped Fiber With Extremely High Aluminum Concentration” OAA '93, pp. 104-107. cited by applicant Chraplyvy et al., “Equalization in Amplified WDM Lightwave Transmission Systems,” IEEE Photonics Tech. Letters, vol. 4, #8, pp. 920-922, Aug. 1992. cited by applicant Desurvire, E., “Erbium-Doped Fiber Amplifier, Principles and Applications,” publ. John Wiley & Sons, Inc., ISBN 0-471-58977-2; Fiber Amplifiers, pp. 480-487. cited by applicant Kashiwada et al., OFC '95, vol. 8, Mar. 3, 1995, pp. 77-78. cited by applicant Giles et al., “Dynamic Gain Equalizationin Two-Stage Fiber Amplifiers,” IEEE Photonics Tech. Letters, vol. 2, #12, Dec. 1990, pp. 866-869. cited by applicant Toba, et al., “A 100-Channel Optical FDM Six-Stage In-Line Amplifier System Employing Tunable Gain Equalizers,” vol. 5, No. 2, IEEE Photometry Technology Letters, Feb. 1993, pp. 248-251. cited by applicant Hakameta, Y. et al., “5 Gb/s Transmission Experiment Using 1300 nm Fabry-Prot LD Transmitter Module with GaAs MESFET LD Driver and p-l-n PD Receiver,”, IEEE Optical Technoloy Letters, vol. 5, No. 2, Feb. 1993, p. 251 only. cited by applicant Goossen, et al., “Micromechanical Gain Slope Compensator for Spectrally Linear Optical Power Equalization”, IEEE 1999, ThV3, pp. 844-845. cited by applicant Tsitlik, et al., “Augmentation of Pressure in a Vessel Indenting the Surface of the Lung ”, Annals of Biomedical Engineering, vol. 15, pp. 259-284, 1987. cited by applicant Ku, et al., “Synthesis of Broadband Matching Networks for Microwave Transistor Amplifiers”, 1977 IEEE International Symposium on Circuits and Systems Proceedings, pp. 704-707. cited by applicant Bassini, et al., “A Hybrid Low-Noise Charge Sensitive Amplifier with Fast Discharge Mechanism”, IEEE Transactions on Nuclear Science, vol. 49, No. 5, Oct. 2002. cited by applicant Steinman, et al., “A New Approach for Determining Maximum Frequency in Clinical Doppler Ultrasound Spectral Estimates”, Proceedings of the 22nd Annual EMBS International Conference, Jul. 23-28, 2000, Chicago, Illinois, pp. 2640-2643. cited by applicant Huth, et al., “Development of an Octal CMOS ASD for the Atlas Muon Detector”, pp. 436-437. cited by applicant Block, et al., “High Energy Predictions for pp and pp Elastic Scattering and Total Cross Sections”, Czechoslovak Journal of Physics, vol. 40, No. 2, pp. 164-175, Feb. 1990. cited by applicant Bouchenaki, et al., “Preparation, Characterization, and Bistable Photoconduction Properties of Thin CdS layers”, Journal of the Optical Society of America (Optical Physics), vol. 8, No. 3, pp. 691-700, Mar. 1991. cited by applicant Mahdi, et al., “Low-Noise and High-Gain L-Band EDFA Utilising a Novel Self-Generated Signal-Seeding Technique”, Optics Communications, vol. 195, No. 1-4, pp. 241-248, Aug. 2001. cited by applicant Kitamura, et al., “Photo-Current Multiplication Phenomenon of Amorphous Silicon-Based Multilayer Photodiodes Fabricated on Crystalline Silicon Substrate”, Japan Journal Applied Physics, vol. 40, (2001) pp. 4794-4798. cited by applicant Wiesenfeld, et al., “Wavelength Conversion at 10 Gb/s Using a Semiconductor Optical Amplifier”, IEEE Photonics Technology Letters, vol. 5, No. 11, Nov. 1993. cited by applicant Santiard, et al., “The Gassiplex0.7-2 Integrated Front-End Analog Processor for the HMPID and the Dimuon Spectrometer of Alice”, pp. 431-432. cited by applicant Divsalar, et al., “Hybrid Concatenated Codes and Iterative Decoding”, ISIT, 1997, Ulm, Germany, Jun. 29-Jul. 4, 1997, p. 10. cited by applicant Faloss, et al., “Lasing Performance of Pyromethene and Perylene Laser Dyes in Xerogel Host”, OSA Tops on Advanced Solid-State Lasers, 1996, vol. 1, pp. 69-71. cited by applicant Yeh, et al., “Viable Deep-Submicron FD/SOI CMOS Design for Low-Voltage Applications”, Proceedings 1994 IEEE International SOI Conference, Oct. 1994, pp. 23-24. cited by applicant Kizhaev, et al., “Lasing in InGaAsP/InP Distributed-Feedback Lasers with a Large Difference between the Bragg Wavelength and the Gain Maximum of the Active Layer”, Sov. Tech. Phys. Letters, vol. 14, No. 2, pp. 119-121, Feb. 1988. cited by applicant Weinberger, “FM-To-AM Converter for Satellite Direct Broadcast TV”, IEEE Transactions on Consumer Electronics, vol. CE-21, No. 4, pp. 404-409, Nov. 1975. cited by applicant Japanese language Office Action mailed Apr. 8, 2003, in Japanese Application 7-049917. cited by applicant Japanese Patent Office Notification of Reasons of Rejection dated Dec. 28, 2004, for corresponding Japanese Patent Application No. 11-074371. cited by applicant Japanese Patent Office Decision dated May 30, 2005, for corresponding Japanese Patent Application No. 11-074371. cited by applicant Japanese Patent Office Notification of Reasons of Rejection mailed Nov. 21, 2000 for corresponding Japanese Patent Application No. 11-074371. cited by applicant Japanese Patent Office Decision of Rejection mailed Jul. 10, 2001 for corresponding Japanese Patent Application No. 11-074371. cited by applicant Appeal Examination Report, dated Mar. 28, 2008, included in an Inquiry of JPO issued Feb. 23, 2010, in corresponding Japanese application 2005-70373. cited by applicant Pan et al., 22nd European Conference on optical communication, ECOC, pp. 273-276. cited by applicant “FiberGain™ Module, Single and Double-Dumped Gain Modules for Optical Amplifiers Operating at 1525-1560nm, Preliminary Information”, Corning Incorporated, P1731, pp. 1-12, issued May 1994 and indicates that it supersedes an issue of Jan. 1994. cited by applicant Yamada, M. et al, “Gain Characteristics of Pr3+doped Fluoride Fiber Amplifier”, Transactions of the Institute of Electronics, Information and Communication Engineers, C-1, vol. J77C-1, No. 1, pp. 17-26, Jan. 1994. cited by applicant Bassini, R. et al., “A Hybrid Low-noise, Charge Sensitive Amplifier with Fast Discharge Mechanism”, 2001 IEEE Nuclear Science Symposium Conference Record, vol. 2, pp. 1014-1017, 2002. cited by applicant Goosen, K. et al., “Micromechanical Gain Slope Compensator for Spectrally Linear Optical Power Equalization”, IEEE Photonics Technology Letters, vol. 12, No. 7, pp. 831-833, Jul. 2000. cited by applicant Gerlas van den Hoven, Alternative Amplifiers, ThJ3, Optical Fiber Communication Conference, 2004, OFC 2004, Publication Date Feb. 23-27, 2004. cited by applicant Masuda, H. et al., “Ultra-wide-band hybrid tellurite/silica fiber Raman amplifier”, OFC Postconference Technical Digest, vol. 1, pp. 338-390, OFC 2002 cited by applicant IEEE Colloquium on “Multi-Octave Active and Passive Components and Antennas”, Professional Groups E12, IEEE May 10, 1989, Digest No. 1989/75, and including J. B. B. Walker, “A Comparision of Two Multi-Octave 3DB Quadrature Couplers”, 6 pages; I. D. Robertson et al., “Novel Techniques for Multi-Octave GaAs MMIC Receivers”, 5 pages; H. Cuckson, “Multi-Octave Mixers & Hybrid Couplers for Wide Band Monopulse Direction Finding Receivers”, 13 pages; B. J. Minnis, “Designing Distributed Amplifiers for Prescribed Gain Slope”, 5 pages; Geen et al, “Broadband GaAs MMICs”, 6 pages; C. S. Aitchison et al, “A Miniature 0.5-8 Ghz 1 Watt Hybrid Distributed Power Amplifier for Phased Array Applications”, 5 pages; N. Watson et al, “Video Breakthrough From Microwave Switches”, 11 pages; J.C. Clifton, “A Design Approach for Broadband Varactor-Tuned Oscillators”, 6 pages; K. T. Adams et al, Multi-Octave FET Voltage Controlled Oscillators, 6 pages; P.E. Foster, “Wideband Antennas for ESM”, 4 pages; P. Newham, “A Wideband Polyrod-FED Hybrid Mode Horn”, 6 pages; S. Uysal, “Microstrip Channelling Filters Using -3 dB Directional Couplers”,4 pages; M. J. Thornton, “Ultra-Broadband Frequency Discriminator Designs for IFM Receivers”, 4 pages. cited by applicant Block, M.M. et al., “High Energy predictions for pp and pp elastic scattering and total cross sections”, Proc. Second International Conference on Elastic and Diffractive Scattering, Elastic and Diffractive Scattering 2, pp. 85-106, 1988. cited by applicant Cheng, F.Y. “Generalized optimal active control algorithm for seismic-resistant structures with active and hybrid control”, International Journal of Computer Applications in Technology, vol. 13, No. 1/2, 2000, pp. 42-51. cited by applicant Young, R., Alternate amplifier technologies, CED, vol. 15, No. 7, pp. 124-126, Jun. 1989. cited by applicant Office Action mailed Sep. 13, 2000 in U.S. Appl. No. 09/264,902. cited by applicant Office Action mailed Apr. 11, 2001 in U.S. Appl. No. 09/264,902. cited by applicant Office Action mailed Nov. 7, 2001 in U.S. Appl. No. 09/264,902. cited by applicant Notice of Allowance and Fee(s) Due mailed Apr. 9, 2002 in U.S. Appl. No. 09/264,902. cited by applicant Supplemental Notice of Allowability mailed Jun. 10, 2002 in U.S. Appl. No. 09/264,902. cited by applicant Notice of Allowance and Fee(s) Due mailed Jun. 17, 2002 in U.S. Appl. No. 09,264,902. cited by applicant Notice of Allowance and Fee(s) Due mailed Sep. 23, 2002 in U.S. Appl. No. 09/264,902. cited by applicant Notice of Allowance and Fee(s) Due mailed Jan. 22, 2003 in U.S. Appl. No. 09/264,902. cited by applicant Issue Notification mailed Jul. 17, 2003 in U.S. Appl. No. 09/264,902. cited by applicant Restriction Requirement mailed Jan. 13, 2005 in U.S. Appl. No. 10/414,237. cited by applicant Office Action mailed Jun. 8, 2004 in U.S. Appl. No. 10/414,237. cited by applicant Office Action mailed Mar. 10, 2005 in U.S. Appl. No. 10/414,237. cited by applicant Office Action mailed Aug. 26, 2005 in U.S. Appl. No. 10/414,237. cited by applicant Notice of Allowance and Fee(s) Due mailed Mar. 6, 2006 in U.S. Appl. No. 10/414,237. cited by applicant Issue Notification mailed May 24, 2006 in U.S. Appl. No. 10/414,237. cited by applicant Notice of Allowance mailed Feb. 23, 2011, in U.S. Appl. No. 11/406,281. cited by applicant Notice of Allowance mailed Dec. 15, 2009, in U.S. Appl. No. 11/406,281. cited by applicant Notice of Allowance mailed Sep. 3, 2009, in U.S. Appl. No. 11/406,281. cited by applicant Notice of Allowance mailed Jun. 25, 2009, in U.S. Appl. No. 11/406,281. cited by applicant Notice of Allowance mailed Mar. 6, 2009, in U.S. Appl. No. 11/406,281. cited by applicant Office Action mailed Jul. 2, 2008, in U.S. Appl. No. 11/406,281. cited by applicant Office Action mailed Oct. 11, 2007, in U.S. Appl. No. 11/406,281. cited by applicant Office Action mailed Jan. 31, 2007, in U.S. Appl. No. 11/406,281. cited by applicant Restriction Requirement mailed Aug. 11, 2006, in U.S. Appl. No. 11/406,281. cited by applicant Office Action mailed Nov. 2, 2010, in U.S. Appl. No. 12/822,797. cited by applicant Notice of Allowance mailed Mar. 17, 2011, in U.S. Appl. No. 12/822,797. cited by applicant |
| Primary Examiner: | Hellner, Mark |
| Attorney, Agent or Firm: | Staas & Halsey LLP |
| رقم الانضمام: | edspgr.08547629 |
| قاعدة البيانات: | USPTO Patent Grants |
| الوصف غير متاح. |