Wavelength-division multiplexing optical transmission system

Details Wavelength-division multiplexing optical transmission system Wavelength-division multiplexing optical transmission system

1990-04-17

1991-04-09

Gonzalez, Frank

350286, G02B 628

Patent

active

050059351

ABSTRACT:
A wavelength-division multiplexing optical transmission system is disclosed which transmits light of wavelengths .lambda..sub.1, .lambda..sub.2 and .lambda..sub.3 (.lambda..sub.1 <.lambda..sub.2 <.lambda..sub.3) by way of a single optical fiber. An optical multiplexer/demultiplexer of the filter type is used which includes a parallelogram prism, a first filter formed on a side face of the parallelogram prism, and second and third filters formed on the opposite side face of the parallelogram. Bidirectional optical fiber communications between the central telephone exchange side and a subscriber side can be achieved using such optical multiplexer/demultiplexer of the filter type. With the arrangement of the invention, an optical multiplexer/demultiplexer of the filter type can be produced at a low cost without the necessity of using a filter having a wide stopping band as a filter to be formed on a parallelogram prism.

REFERENCES:
patent: 3704061 (1972-11-01), Travis
patent: 3767290 (1973-10-01), Lang et al.
patent: 4693544 (1987-09-01), Yamasaki et al.
patent: 4824200 (1989-04-01), Isono et al.

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