Accession Number : ADD012329

Title :   Method of Wavelength Multiplexing in Fused Single-Mode Fiber Couplers.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : McLandrich,Matthew N

Report Date : 10 Dec 1985

Pagination or Media Count : 5

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. (Author)

Descriptors :   *PATENTS, *MULTIPLEXING, *COUPLING(INTERACTION), *FIBER OPTICS, *WAVEGUIDE COUPLERS, DATA LINKS, INFORMATION TRANSFER, OPTICAL DATA, DUAL MODE, OPTICAL PROPERTIES, ELECTROMAGNETIC COMPATIBILITY, THROUGHPUT, FUSED SILICA, CROSSTALK, OPTICS, FIBERS, TRAVEL, FREQUENCY, COEFFICIENTS

Subject Categories : Fiber Optics and Integrated Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE