Method of wavelength multiplexing in fused single-mode fiber cou

Details Method of wavelength multiplexing in fused single-mode fiber cou Method of wavelength multiplexing in fused single-mode fiber cou

1981-11-02

1985-12-10

Sikes, William L.

Multiplex communications

Wide area network

Packet switching

350 9616, 370 1, G02B 514

Patent

active

045575533

ABSTRACT:
An apparatus and method of entering and extracting a discrete wavelength of optical data in a single-mode duplex optical data transmission system relies on a selective evanescent field coupling. A continuous single-mode fiber transmits the two wavelengths in opposite directions with respect to each other. A length of a like single-mode fiber is fused to the continuous single-mode fiber such that the product of the fused length and the coupling coefficient of the fiber pairs equals .pi./2 at one of the optical frequencies to effect one-hundred percent evanescent field coupling to and from the continuous fiber. The product of the coupling coefficient and the fused length equals .pi. at the other optical wavelength to effect a zero percent evanescent field coupling. The other wavelength travels the length of the continuous single-mode fiber uninterrupted while the first wavelength is selectively coupled and decoupled from the fiber as desired.

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