Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1997-08-29
2000-09-19
Moskowitz, Nelson
Optical: systems and elements
Optical amplifier
Optical fiber
359124, 359130, 385 37, H01S 310, H04B 1016, H04J 1402, G02B 628
Patent
active
061220965
ABSTRACT:
An expandable optical add/drop system according to the present invention includes an optical add/drop multiplexer with an integrated amplification and wavelength-selective fiber path and passive optical couplers for selectively adding and dropping wavelengths from a multi-wavelength signal, such as a wavelength division multiplexed optical signal. One or more fiber gratings are disposed along the length of a rare earth-doped optical fiber or between segments of the rare earth-doped optical fiber so that at least one grating is used for reflecting each optical signal that is to be added to or dropped from the multi-wavelength optical signal. By using this configuration, appropriate amplification is provided to compensate for specific losses in the add, drop, and through paths for existing and future add/drop service.
REFERENCES:
patent: 5058974 (1991-10-01), Mollenauer
patent: 5218608 (1993-06-01), Oaki
patent: 5579143 (1996-11-01), Huber
patent: 5600473 (1997-02-01), Huber
patent: 5633741 (1997-05-01), Giles
patent: 5742416 (1998-04-01), Mizrahi
patent: 5778118 (1998-07-01), Sridhar
"Low-Loss Add/Drop Multiplexers for WDM Lightwave Networks" by C. R. Giles of AT&T Bell Laboratories, Crawford Hill Laboratory, Holmdel, NJ 07733-0400, and V. Mizrahi of AT&T Bell Laboratories, Murray Hill, NJ 07974-0636, IOOC-95, pp. 66-68.
"Repeatered Bidirectional 10 Bb/s-240 km Fiber Transmission Experiment" by J.-M. P. Delavaux, C. R. Giles, S. W. Granlund, and C. D. Chen; Lucent Technologies Inc., Bell Laboratories, Breinigsville, Pennsylvania 18031-9351 and Lucent Technologies Inc., Bell Laboratories, Crawford Hill, New Jersey 07733-0400; Optical Fiber Technology 2, pp. 351-357 (1996), Article No. 0040.
"Long-period fiber-grating-based gain equalizers" by Ashish M. Vengsarkar, J. Renee Pedrazzani, Justin B. Judkins, and Paul J. Lemaire of AT&T Bell Laboratories, 600 Mountain Avenue, Murray Hill, New Jersey 07974 and Neal S. Bergano and Carl R. Davidson of AT&T Bell Laboratories, 101 Crawfords Corner Road, Holmdel, New Jersey 07733; Optics Letters, vol. 21, NO. 5, Mar. 1, 1996; pp. 336-338.
"Strong Bragg Gratings in Non Sensitized Low Loss Planar Waveguides as Building Blocks for WDM Network Components" by Jorg Hubner, Jean-Marc Jouanno, Jens Engholm Pedersen, Rasmus Kromann, Thomas Feuchter and Martin Kristensen; Mikroelektronik Centret, Technical University of Denmark, DK-2800 Lyngby, Denmark and NKT Research Center A/S, Sognevej 11, DK-2065 Brondby, Denmark, SPIE vol. 2998, No. 12, Photonics West 97, San Jose, CA 1997; pp. 1-11.
Lucent Technologies - Inc.
Moskowitz Nelson
Murgia Gregory J.
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