Optical transmitter, optical receiver and optical transmission a

Details Optical transmitter, optical receiver and optical transmission a Optical transmitter, optical receiver and optical transmission a

1991-04-30

1993-12-28

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359182, 359185, 359173, H04B 1004, H04B 1006

Patent

active

052744906

ABSTRACT:
A unipolar original electrical signal is encoded by alternate mark inversion and combined with a DC bias current for injection of a semiconductor laser to produce a bipolar FSK optical signal that is transmitted to a receiver. At the receiver, the received signal is coupled with optical local power and fed to an optical/electrical transducer, preferably a semiconductor, to produce an electrical signal that is demodulated to produce the original unipolar signal. The demodulator may be of different types, for example employing delaying part of the amplified electrical signal and mixing the delayed part with the original signal for passage of the combined signal through a low pass filter; with proper selection of the delay, an AMI decoder is not needed. The demodulator may also be of the type that has one or more band pass filters to respectively separate the positive mark, space and negative mark signals that may thereafter be added. Filtering and polarization beam splitting may also be used in the demodulator for improving the signal-to-noise ratio and preventing other types of degradation.

REFERENCES:
Emura et al; "System Design and Long-Span Transmission . . . Detection System"; Journal of Lightwave Tech. , vol. Lt-5, No. 4, Apr. 1987, pp. 469-477.
J. Buchner; "Ternary line codes", Philips Telecommunication Review, vol. 34, No. 2, Jun. 1976, pp. 72-86.
Vodhanel et al, Journal Of Lightwave Technology, "FSK Heterodyne Transmission Experiments at 560 Mbit/s and 1 Gbit/s", vol. LT-5, No. 4, Apr. 1987, pp. 461-468.
Emura et al, Electronic Letters, "Over 300 km Transmission Experiment on an Optical FSK Heterodyne Dual Filter Detection System", vol. 22, No. 21, Oct. 9, 1986, pp. 1096-1097.
Tsushima et al, The Transactions of the IEICE, "Improvement of Polarization Diversity Method for Heterodyne/Coherent Optical Transmission Systems", vol. E70, No. 7, Jul. 1987, pp. 608-610.
Enning, "Bipolar FSK Heterodyne Transmission Experiment at 150 Mbit/s Using a Directly Modulated Unequalized DFB Laser", OFC 1988 p. 14.

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