Wavelength-selective and loss-less optical add/drop multiplexer

Details Wavelength-selective and loss-less optical add/drop multiplexer Wavelength-selective and loss-less optical add/drop multiplexer

1997-08-29

2000-09-19

Moskowitz, Nelson

Optical: systems and elements

Optical amplifier

Correction of deleterious effects

359127, 359130, 359349, H04J 1402, G02B 628, H01S 300

Patent

active

061220957

ABSTRACT:
A loss-less, optical add/drop multiplexer according to the present invention includes a rare earth-doped fiber amplifier integrated with a wavelength-selective fiber path coupled between two directional optical transfer devices for selectively adding and dropping optical signals from a multi-wavelength signal, such as a wavelength division multiplexed optical signal. One or more fiber gratings are disposed along the length of the rare earth-doped fiber amplifier or between segments of the rare earth-doped fiber so that at least one grating is used for reflecting each optical signal that is expected to be added to or dropped from the multi-wavelength optical signal. By using this configuration, appropriate amplification is provided to compensate for losses in the add, drop, and through paths.

REFERENCES:
patent: 5058974 (1991-10-01), Mollenauer
patent: 5218608 (1993-06-01), Aoki
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 Gb/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.
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"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.

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