Integrated optical waveguide circuit and optical branch line test system using the same

An integrated optical waveguide circuit comprising:

• a substrate;
• an optical wavelength multiplexer formed on a surface of said substrate and composed of a first slab optical waveguide, a second slab optical waveguide, a third slab optical waveguide, means for inputting light to said first and second slab optical waveguides, a first array of optical waveguides arranged in parallel and having different lengths, a second array of optical waveguides arranged in parallel and having different lengths, said first slab optical waveguide being connected to said third slab optical waveguide via said first array of optical waveguide and said second slab optical waveguide being connected to said third slab optical waveguide via said second array of optical waveguides, and a plurality of output optical waveguides arranged in parallel and connected to the third slab optical waveguide;
• and
• an optical power splitter formed on said surface of the substrate and composed of said third slab optical waveguide, an input optical waveguide formed between said first array of optical waveguides and said second array of optical waveguides and connected to said third slab optical waveguide, and said plurality of output optical waveguides arranged in parallel and connected to the third slab optical waveguide.

An integrated optical waveguide circuit comprising:

• a substrate;
• an optical wavelength multiplexer formed on a surface of said substrate and composed of a single or a plurality of input/output optical waveguides arranged in parallel, a slab optical waveguide connected to said input/output optical waveguide(s), an array of optical waveguides arranged in parallel and having different lengths and connected to said slab optical waveguide, and a mirror being provided at an end of said array of optical waveguides and reflecting light of a specific wavelength;
• and
• an optical power splitter formed on said surface of said substrate and composed of said slab optical waveguide, a single or a plurality of input waveguides arranged in parallel and connected to said slab optical waveguide, and said input/output optical waveguides as output optical waveguides.

An optical distribution line test system, comprising:

• an optical line test device for inputting test light to individual optical lines branched by an optical splitter formed only using passive optical components;
• wherein said optical splitter is an optical power splitter with wavelength router comprising:
• a substrate;
• an optical wavelength multiplexer formed on a surface of said substrate and composed of a first slab optical waveguide, a second slab optical waveguide, a single or a plurality of input optical waveguides connected to said first slab optical waveguide at one end of the first slab optical waveguide, a array of optical waveguides arranged in parallel and having different lengths and connected to the first slab optical waveguide and the second slab optical waveguide, and a plurality of output optical waveguides arranged in parallel and connected to the second slab optical waveguide;
• and
• an optical power splitter formed on said surface of the substrate and composed of said second slab optical waveguide, means for inputting light to said second slab optical waveguide, and said plurality of output optical waveguides arranged in parallel and connected to the second slab optical waveguide;
• and said optical line test device includes a wavelength variable light source and means for selecting an optical line to be tested by changing over the wavelength of the test light.

An optical distribution line test system, comprising:

• an optical line test device for inputting test light to individual optical lines branched by an optical splitter formed only using passive optical components;
• wherein said optical splitter is an optical power splitter with wavelength router comprising:
• a substrate;
• an optical wavelength multiplexer formed on a surface of said substrate and composed of a single or a plurality of input/output optical waveguides arranged in parallel, a slab optical waveguide connected to said input/output optical waveguide(s), an array of optical waveguides arranged in parallel and having different lengths and connected to said slab optical waveguide, and a mirror being provided at an end of said array of optical waveguides and reflecting light of a specific wavelength;
• and
• an optical power splitter formed on said surface of said substrate and composed of said slab optical waveguide, a single or a plurality of input waveguides arranged in parallel and connected to said slab optical waveguide, and said input/output optical waveguides as output optical waveguides;
• and said optical line test device includes a wavelength variable light source and means for selecting an optical line to be tested by changing over the wavelength of the test light.

An optical distribution line test system, comprising:

• an optical line test device for inputting test light to individual optical lines branched by an optical splitter formed only using passive optical components;
• wherein said optical splitter is an optical power splitter with wavelength router formed on a surface of a substrate,
• and said optical line test device includes a wavelength variable light source and means for selecting an optical line to be tested by changing over the wavelength of the test light;
• and
• wherein said wavelength variable light source comprises an optical amplifier, a 1.times.N switch, and a second optical wavelength multiplexer, connected in a ring form;
• and said second optical wavelength multiplexer comprises a single or a plurality of input waveguides arranged in parallel, a first slab optical waveguide, an array of optical waveguides arranged in parallel and having different lengths, a second slab optical waveguide, and a plurality of output optical waveguides arranged in parallel, being connected in series.

A PDS test system for line identification of individual optical lines branched by an optical splitter formed only of passive optical components comprising:

• means for inputting test light from individual distribution lines to said optical splitter;
• means for varying wavelength of the test light within a predetermined range;
• means for measuring a return light intensity to test the individual optical lines;
• wherein said optical splitter is an optical power splitter with wavelength router formed on a surface of a substrate;
• wherein said means for varying wavelength comprises an optical amplifier, a 1.times.N switch, and a second optical wavelength multiplexer, connected in a ring form;
• and said second optical wavelength multiplexer comprises a single or a plurality of input waveguides arranged in parallel, a first slab optical waveguide, an of array of optical waveguides arranged in parallel and having different lengths, a second slab optical waveguide, and a plurality of output optical waveguides arranged in parallel, being connected in series.