H - Electricity – 04 – J
Patent
H - Electricity
04
J
H04J 1/08 (2006.01) G02B 6/34 (2006.01) H04J 14/02 (2006.01)
Patent
CA 2077881
This invention provides a wavelength division multiplexer and a wavelength division demultiplexer by combining a wavelength-selective mode converter (3) with a wavelength-independent mode splitter (5). The demultiplexer comprises a monomodal input channel (1), an adapter (2) to the bimodal input of a 100%TX00-TY01(.lambda.1) mode converter (3), a bimodal junction channel (4), and a mode splitter (5) having a first output channel (6) and a second output channel (7), both monomodal, the first output channel (6) having a higher propagation constant than the second. A .lambda.1 component, which propagates with a polarisation TX(TE or TM) in an input signal Si1(.lambda.1,.lambda.2,.lambda.3,--), will, after conversion in the converter (3), propagate in the intermediate channel (4), in the first-order guided mode having the polarisation TY (TE or TM), and subsequently leave a splitter via output channel (7). The remainder of the input signal is not affected by the converter, therefore remains in the zero-order mode in the intermediate channel (4), and will leave the splitter (5) via output channel (6). The multiplexer operates in the opposite direction. Advantages: Completely producible in integrated form, no fabrication steps of a different type required other than for the fabrication of the connecting optical waveguide.
Fetherstonhaugh & Co.
Koninklijke Kpn N.v.
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