Waveguide type wavelength multiplexing/demultiplexing module

Details Waveguide type wavelength multiplexing/demultiplexing module Waveguide type wavelength multiplexing/demultiplexing module

1996-12-03

1998-08-25

Ngo, John

Optical waveguides

With optical coupler

Particular coupling structure

385 14, 385 47, G02B 626

Patent

active

057991200

ABSTRACT:
In a waveguide type wavelength multiplexing/demultiplexing (WDM) module, a wavelength multiplexing/demultiplexing function can be realized with a half length of the conventional directional coupling device. The waveguide type WDM module is comprised of: a common waveguide for conducting first signal light having a first wavelength and second signal light having a second wavelength; common light input/output means coupled to the common waveguide; a substrate containing a WDM unit for multiplexing/demultiplexing the first signal light and the second signal light; a first waveguide for conducting the first signal light; first light input/output means optically coupled to the first waveguide; and second light input/output means for inputting/outputting the second signal light. The WDM unit includes a directional coupling type WDM device constituted by two sets of waveguides connected to the first waveguide and the common waveguide respectively. The directional coupling type WDM device is comprised of: a first edge surface perpendicular to a waveguide for constituting a directional coupling unit at a position equal to a half of a complete coupling length with respect to the first signal light in the directional coupling unit; and wavelength selecting means arranged at the first edge surface, for reflecting the first signal light and for passing there-through the second signal light; and the second light input/output means is comprised of coupling means for optically being coupled to the second signal light at the first edge surface.

REFERENCES:
patent: 5479547 (1995-12-01), Kunikane et al.
patent: 5521993 (1996-05-01), Lerminiaux et al.
patent: 5579154 (1996-11-01), Mueller-Fiedler et al.
Y. Yamada et al., "A Hybrid Integrated Optical WDM Transmitter/Receiver Module for Optical Subscriber Systems Utilizing a Planar Lightwave Circuit Platform", OFC 1995, PD12-1 to PD12-5.

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