Modular cascaded Mach-Zehnder DWDM components

Details Modular cascaded Mach-Zehnder DWDM components Modular cascaded Mach-Zehnder DWDM components

1997-08-29

1999-11-02

Bacares, Rafael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359127, 385 24, H04J 1400

Patent

active

059781149

ABSTRACT:
A multiple channel fiber optic multiplexer, demultiplexer, multiplexer/demultiplexer, and/or add/drop component includes a plurality of Mach-Zehnder interferometer units, each unit including a pair of 50/50 fiber optic couplers connected by a pair of Bragg gratings and three functional ports including two multi-channel input output ports, one single channel input/output port, the Bragg gratings being tuned to a wavelength of the single channel input/output port, and input/output ports of adjacent interferometer units being connected to each other by fusion splices in a cascade configuration, the component including a first common input/output connector on a first of said cascaded interferometer units and a second common input/output connector on a last of said cascaded interferometer units, with the second common input/output connector being arranged to permit the addition of add-on multi-channel components. The cascaded components, which can be uni-directional or bi-directional, can be connected to each other as serial add-on units, or in the case of modular uni-directional components, be used to upgrade existing NWDM systems to DWDM systems having a greater number of channels by utilizing the existing NWDM components as combiners to connect the cascaded uni-directional components in parallel.

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Jay S. Van Delden, "Optical Circulators Improve Bidirectional Fiber Systems", Laser Focus World, Nov. 1995, pp. 109-112.

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