Wavelength division multiplex bothway optical communication syst

Details Wavelength division multiplex bothway optical communication syst Wavelength division multiplex bothway optical communication syst

1994-01-13

1995-09-05

Moore, David K.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359127, 359152, 385 24, H04J 1402

Patent

active

054483905

ABSTRACT:
Bothway optical communication is carried out through a wavelength division multiplex system between two terminal stations (11a, 12a), each having a two-beam interference type filter (15) coupled with an optical cable (10) for multiplexing and/or de-multiplexing transmitted light and received light. The filter (15) has passbands and attenuation bands having periodic characteristics for the wavelength in the communication wavelength band. The wavelength of the transmitted light is essentially the same as the wavelength of the received light in each terminal station, with a small offset of the two wavelengths less than 5 nm. The oscillation wavelength of the laser (21) for transmission is adjusted so that it coincides with the passband of the filter, which doubles as a reference wavelength of the oscillation wavelength of the laser. Preferably, the two-beam interference type filter (15) is a Mach Zehnder type asymmetrical interferometer having a pair of directional couplers (F1, F2) connected to each other through a pair of optical fibers (f1, f2) so that the period of the passbands and/or the attenuation bands of the filter (15) is adjustable.

REFERENCES:
patent: 5317440 (1994-05-01), Hsu
patent: 5317441 (1994-05-01), Sidman
"A Study of Optical Functional Integrated Circuit that Uses Silica-Based Waveguide Technique", Tsuchiya et al, IEICE Trans. Commun., vol. E75-B, No. 9, Sep. 1992, pp. 871-879.
IEEE 4th Workshop on Optical Local Networks, Sep. 24-25, 1992, pp. 63-69.
"Silica-Based Single-Mode Waveguides on Silicon and Their Application to Guided-Wave Optical interferometers", IEEE Journal of Lightwave Technology, vol. 6, No. 6, Jun. 1988, pp. 1003-1010.

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