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

1989-01-19

1991-06-11

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

329302, 455608, H04B 1006

Patent

active

050239503

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:
patent: 4397042 (1983-08-01), Tswii
Takasaki, "Line Coding Plan for Fiber Optic Communication System", pp. 1081-1082 of Proceedings of IEEE, 7-75.
Emura, "Novel Optical FSK Heterodyne Single Filter Detection System Using a Directly Modulated DEB-Laser Diode ", pp. 1022-1023, Electronic Letters 1984.
14th European Conference on Optical Communication, 1988, pp. 174-179.
11th Symposium on Information Theory and its Applications, 1988, "Novel Optical FSK Modulation/Demodulation etc.", H. Tsushima et al., 4 pages.
OFC'88, Wed. Morning/71, "Bipolar FSK Heterodyne Transmission Experiment at 150 Mbit/s Using a Directly Modulated Unequalized DFB Laser Dioe", B. Enning.
IEEE Journal of Quantum Electronics, vol. QE-19, No. 2, 1983 "S/N and Error Rate Evaluation for an Optical FSK-Heterodyne etc.", S. Saito et al., pp. 180-193.

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