Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1992-09-08
1994-06-28
Chilcot, Jr., Richard E.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359115, 385 28, 385 14, 385 45, H04J 1400
Patent
active
053252217
ABSTRACT:
The 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%TX.sub.00 -TY.sub.01 (.lambda..sub.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..sub.1 component, which propagates with a polarization TX (TE or TM) in an input signal S.sub.i1 (.lambda..sub.1, .lambda..sub.2, .lambda..sub.3 . . . ), will, after conversion in the converter (3), propagate in the intermediate channel (4), in the first-order guided mode having the polarization TY (TE or TM), and subsequently leave the 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 waveguides.
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K. O. Hill, "A Novel Low-Loss Inline Biomodal-Fiber Tap: Wavelength-Selective Properties", Jun., 1990, 484-486, IEEE Photonics Technology Letters, No. 7.
Bacares Rafael
Chilcot Jr. Richard E.
Koninklijke PTT Nederland N.V.
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