Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1989-06-07
1990-09-18
Gonzalez, Frank
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455612, 455617, G02B 626
Patent
active
049573390
ABSTRACT:
An optical communication system in which transmission takes place in a single optical-waveguide mode by means of low-cost optical transmitters and receivers although two or more modes could propagate in the optical waveguide (1) at the operating wavelength, is supplemented by optical-waveguide sections (2, 3) between the transmitters (S, S1, S2) and receivers (E, E1, E2) and the optical waveguide (1) which are "single-mode" at the operating wavelength and contain the optical connectors (4, 5). This eliminates the need for connectors at the junctions between the optical-waveguide sections ( 2, 3) and the optical waveguide (1), so that no modal noise and modal dispersion can occur as a result of mode conversion.
REFERENCES:
patent: 4330870 (1982-05-01), Arends
patent: 4637072 (1987-01-01), Hellstrom
patent: 4831662 (1989-05-01), Kuhn
patent: 4910727 (1990-03-01), Fussganger
M. Stern et al., "Short Wavelength Transmission on 1300 nm Optimized Single Mode Fiber", SPIE, vol. 841, Fiber Optic Networks & Coherent Technology in Fiber Optic Systems II, 1987, pp. 116-123.
Fussganger Kurt
Krimmel Heinz G.
ALCATEL N.V.
Gonzalez Frank
Heartney Phan T.
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