Integrated optical multiplexer-and-demultiplexer
AssigneeKabushiki Kaisha Toshiba
InventorsMasahiro Ogusu, Shigeru Ohshima
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Abstract
An integrated optical multiplexer-and-demultiplexer comprising an arrayed waveguide having an optical delay portion imparting an optical band-pass characteristic, a lens secured to one end of the arrayed waveguide, and a diffraction grating opposing the lens. The optical delay portion is made of a light-transmitting medium selected from the group consisting of air and material composed of at least two substances exhibiting a minimum temperature coefficient to an optical length.
Claims12
An integrated optical multiplexer-and-demultiplexer for use in wavelength multiplex optical communication, comprising:
- an arrayed waveguide;
- a lens secured to one end of said arrayed waveguide;
- a diffraction grating opposing said lens;
- an optical delay portion between said lens and said diffraction grating, which imparts an optical band-pass characteristic and which is made of one of air and a light-transmitting medium composed of substances exhibiting a minimum temperature coefficient to an optical length;
- and
- a cylindrical lens for collimating light emitted from said lens.
An optical multiplexer-and demultiplexer comprising:
- an arrayed waveguide device including a substrate, an array of waveguides provided on said substrate and having different lengths, at least one pair of input-output waveguide ports, and two-dimensional waveguides coupled with said input-output waveguide ports, respectively;
- and
- an optical delay portion located at a part of said array of waveguides and formed of light-transmitting medium imparting an optical band-pass characteristic and exhibiting a minimum temperature coefficient to an optical length, said light-transmitting medium being a temperature compensation region, said temperature compensation region being gradually narrowed in width in an array direction in which said waveguides of said array of waveguide are arrayed.
An integrated optical multiplexer-and-demultiplexer with a Mach-Zehnder filter for use in wavelength multiplex optical communication, comprising:
- at least two input-output waveguide ports arranged on both sides of a substrate, respectively, and at least two waveguides provided on said substrate and having different lengths;
- and
- a temperature compensation region which is provided at a part of one of said waveguides.
Dependencies are inferred from the claim text.