Method and system for equalizing PMD using incremental delay swi

Details Method and system for equalizing PMD using incremental delay swi Method and system for equalizing PMD using incremental delay swi

1996-06-26

1998-10-13

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359156, 359140, H04B 1000

Patent

active

058221000

ABSTRACT:
A polarization mode compensation system and method using optical switch elements to establish incremental delays between different polarization modes of an optical data signal is provided. A polarization mode separator separates the optical data signal into first and second orthogonally polarized optical signals. A first variable switching delay element provides a first incremental propagation delay for the first polarized optical signal. A second variable switching delay element provides a second incremental propagation delay for the second polarized optical signal. The first and second variable switching delay elements consist of a series of optical switches optically interconnected by different incremental lengths of optical fiber. For example, 2.times.2 optical switches are provided for switching between a reference fiber segment and a respective delay fiber segment to provide a relative incremental propagation delay. A controller controls optical switches in the first and second variable switching delay elements to set first and second incremental propagation delays. In particular, the first and second polarized optical signals are incrementally delayed relative to one another so as to compensate for polarization mode dispersion. A beam combiner then combines the first and second polarized optical signals to form an optical output data signal which can be detected accurately by a receiver without the effects of polarization mode dispersion. In this way, optical data signals can be reliably transmitted over greater distances along a long-haul fiber optic dispersive medium at even greater bit-rates and bandwidth.

REFERENCES:
patent: 5659412 (1997-08-01), Hakki
B. W. Hakki, "Polarization Mode Dispersion Compensation by Phase Diversity Detection", IEEE Photonics Technology Letters, vol. 9, No. 1, pp. 121-123. Jan. 1997.
Ono et al., "Polarization Control Method for Suppressing Polarization Mode Dispersion Influence in Optical Transmission Systems," Journal of Lightwave Technologyvol. 12, No. 5, pp. 891-898, May, 1994.
Ozeki et al., "Polarization-Mode-Dispersion Equalization Experiment Using a Variable Equalizing Optical Circuit Controlled by a Pulse-Waveform-Comparison Algorithm," Tuesday Afternoon, OFC '94 Technical Digest, pp. 62-64, 1994.
Takahashi et al., "Automatic Compensation Technique for Timewise Fluctuating Polarisation Mode Dispersion in In-Line Amplifier Systems," Electronics Letters, vol. 30, No. 4, pp. 348-349, Feb. 17, 1994.

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