Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1995-10-12
1996-12-31
Chin, Wellington
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359133, 359122, 359156, H04J 1402
Patent
active
055899692
ABSTRACT:
The present invention provides a wavelength division multiplexed optical fiber transmission equipment which can increase the number of channels of the WDM signal by reducing a required bandwidth of optical signals while suppressing an interference between signals caused by four-wave mixing. A WDM optical transmitting terminal comprises five or more optical transmitters and the wavelengths of optical signals from the optical transmitters are set such that the spacing between the wavelengths of two signals is re-used as the spacing between the wavelengths of other two signals separated by the above signals by two or more waves and there is no periodicity in the channel spacing s. For instance, the wavelengths of the optical signals are set as shown in FIG. 1. As the result, deterioration in the transmission characteristics of the optical signals can be effectively reduced and, at the same time, the maximum number of channels of the WDM signal can be increased. To the WDM optical transmitting terminal is added polarization state controllers for controlling the state of polarization such that the states of polarizations of adjacent signals cross each other at an output of the WDM optical transmitting terminal.
REFERENCES:
patent: 5305134 (1994-04-01), Tsushima et al.
"Reduction of Four-Wave Mixing Crosstalk in WDM Systems Using Unequally Spaced Channels'", IEEE Photonics Technology Letters, vol. 6, No. 6, Jun. 1994, pp. 754-756 by F. Forghieri et al.
"Electronics Letters", vol. 24, No. 24, Nov. 24, 1988, pp. 1528-1529 by N. Shibata et al.
Akiba Shigeyuki
Edagawa Noboru
Taga Hidenori
Takeda Noriyuki
Yamamoto Shu
Chin Wellington
Kokusai Denshin Denwa Kabushiki Kaisha
Negash Kinfe-Michael
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