Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1990-01-29
1992-12-08
Coles, Sr., Edward L.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359181, H04J 1402
Patent
active
051702738
ABSTRACT:
A cross-talk reducing optical switching system receives electrical digital signals at its input terminals. The electrical signals are converted to frequency-shift keying (FSK) optical signals, which differ in center wavelength .lambda..sub.i (i=1 to N). The FSK signals are wavelength-division multiplexed (WDM) into a WDM signal which is next split into wavelength-corresponding optical WDM signals W. A wavelength extracting circuit then extracts optical FSK signals pertaining to center wavelength .lambda..sub.i, which are to be switched to center wavelengths .lambda..sub.j (j=1 to N), from the WDM signals W. The extracted FSK signals are next switched to optical FSK signals corresponding to center wavelengths .lambda..sub.j. Finally, the switched FSK signals are wavelength-multiplexed and converted back into electrical digital signals, thus establishing predetermined communication channels between a plurality of input terminals and a plurality of output terminals.
REFERENCES:
patent: 5027435 (1991-06-01), Chraplyvy et al.
Nishio et al, "Eight-Channel Wavelength-Division Switching Experiment using Wide-Tuning-Range DFB LD Filters", IEE ECOC 88, Conference Publication No. 292--Part 2.
Magari et al, "Optical Narrow-Band Filters Using Optical Amplification with Distributed Feedback," IEEE Journal of Quantum Electronics, vol. 34, No. 11, Nov. 1988.
Kobayashi et al, "Injection Locking in AlGaAs Semiconductor Laser", IEEE Journal of Quantum Electronics, vol. QE-17, No. 5, May, 1981.
I. Kaminow et al, "FDMA-FSK Star Network with a . . . Filter Demultiplexer", Journal of Lightwave Technology, vol. 6, No. 9, Sep. 1988, pp. 1406-1414.
M. Fujiwara et al, "Application of Coherent Optical Transmission Technologies to Photonic Switching Networks", The Transactions of the IEICE, vol. E72, No. 1, Jan. 1989, pp. 55-61.
Coles Sr. Edward L.
NEC Corporation
Negash Kinfe-Michael
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