Optical waveguides – With optical coupler – Plural
Patent
1995-05-26
1996-09-24
Ngo, John
Optical waveguides
With optical coupler
Plural
359179, G02B 628
Patent
active
055599109
ABSTRACT:
It is the object of the present invention to optimize the degradation due to the four-wave mixing of wavelength multiplexed signals and the distortion due to the chromatic dispersion, thereby to provide a wavelength division multiplexed optical fiber transmission equipment having good transmission characteristics. A WDM transmitting terminal consists of four transmitters of channels 1 to 4, and a wavelength-division multiplexer. Further, a WDM receiving terminal consists of an equalization optical fiber, a wavelength-division demultiplexer, and four receivers of the channels 1 to 4. The WDM transmitting terminal and the WDM receiving terminal are interconnected by transmission optical fibers and an optical amplifier. The equipment is designed so that the wavelengths .lambda..sub.1, .lambda..sub.2, .lambda..sub.3 and .lambda..sub.4 of the optical signals output from the transmitters all lie on the short-wavelength side with respect to the average zero-dispersion wavelength .lambda..sub.0. This allows the distortion due to the four-wave mixing of a wavelength multiplexed signal to be reduced. The equalization optical fiber has a chromatic dispersion of a sign opposite to the chromatic dispersion of the optical fibers forming a transmitting path, thereby for compensating the chromatic dispersion of the optical signals output from the transmitters.
REFERENCES:
patent: 5392147 (1995-02-01), Kaede et al.
patent: 5392377 (1995-02-01), Auracher
patent: 5414548 (1995-05-01), Tachikawa et al.
"Experimental Verification of Efficiency of Wave Generation Through Four-Wave Mixing in Low-Loss Dispersion-Shifted Single-Mode Optical Fibre", Electronics Letters, 24th Nov. 1988, vol. 24 No. 24, pp. 1528-1529.
"Design of Optical-Amplifier Repeated WDM Systems", The Spring National Conference of the Institute of Electronic Information and Communication Engineers, 1994 SB-8-6.
"Frequency Chirping in External Modulators", Journal of Lightwave Technology, Jan. 1988, vol. 6, no. 1, pp. 87-93.
Akiba Shigeyuki
Edagawa Noboru
Taga Hidenori
Takeda Noriyuki
Yamamoto Shu
Kokusai Denshin Denwa Kabushiki Kaisha
Ngo John
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