Optical transmitter for subcarrier frequency multiplexed optical

Details Optical transmitter for subcarrier frequency multiplexed optical Optical transmitter for subcarrier frequency multiplexed optical

1995-06-16

1996-10-29

Boudreau, Leo

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359161, H04J 1402

Patent

active

055702198

ABSTRACT:
The subcarrier frequency multiplexed optical transmission system disclosed is one in which a plurality of analog subcarrier signals and at least one digital subcarrier signal is optically transmitted by frequency multiplexing. The system includes an amplitude limiter, a filter, a multiplexer and a semiconductor laser. Portions of the analog subcarrier signals which are lower in level than the threshold value of the semiconductor laser are eliminated by the amplitude limiter, and further impulse distortions generated due to clipping in the frequency band of the digital subcarrier signal are eliminated by the filter. Then, the analog and digital subcarrier signals are frequency multiplexed to be inputted to the semiconductor laser. The system enables to reduce the transmission quality deterioration of digital subcarrier signal caused by clipping.

REFERENCES:
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patent: 5283679 (1994-02-01), Wedding
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Kanazawa et al., "Pre-Clipping Method to Reduce Clipping-Induced Degradation in Hybrid Analog/Digital Subcarrier-Multiplexed Optical Transmission Systems", IEEE Photonics Technology Letters, vol. 7, No. 9, Sep. 1995, pp. 1069-1071.
A. H. Gnauck, et al., "Comparison of Direct and External Modulation For CATV Lightwave Transmission at 1.5 .pi.m Wavelength", Electronics Letters, vol. 28, No. 20, Sep. 24, 1992, pp. 1875-1876.
Maeda, et al., "Analysis of BER of 16QAM Signal in AM/16QAM Hybrid Optical Transmission System", Electronics Letters, vol. 29, No. 7, Apr. 1, 1993, pp. 640-642.
Ho, et al., "Equalization Technique to Reduce Clipping-Induced Nonlinear Distortion in Subcarrier-Multiplexed Lightwave Systems", IEEE Photonics Technology Letters, vol. 5, No. 9, Sep. 1993, pp. 1100-1103.

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