Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1990-03-30
1991-09-24
Lee, John D.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359127, 359116, 385 24, G02B 628
Patent
active
050509527
ABSTRACT:
For an optical communications system for diplex or duplex transmission, especially for the subscriber area, a new multiplexing process, namely, the combination of fiber mode multiplexing and wavelength multiplexing, is reported, i.e., the two signals to be transmitted are transmitted with different fiber modes (LP.sub.01, (LP.sub.11) and with different wavelengths (.lambda..sub.1, .lambda..sub.2) unidirectionally or bidirectionally via a single waveguide. Fusion couplers with exactly similar fibers (FIG. 3) are used as system components such as multiplexers, demultiplexers, and duplexers when one of the two wavelengths is above and one is below the cutoff wavelength of the coupler waveguide and the transmission waveguide (104, 114); or fusion couplers (21, 31) with dissimilar fibers are used when both wavelengths are below the cutoff wavelength.
REFERENCES:
patent: 4834481 (1989-03-01), Lawson et al.
patent: 4955014 (1990-09-01), Kuppers et al.
"Highly Selective Evanescent Modal Filter for Two-Mode Optical Fibers," Optics Letters, Sep. 1986, vol. 11, No. 9, pp. 581-583.
No affiliations
Alcatel N. V.
Barns Stephen W.
Lee John D.
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