Canon Kabushiki Kaisha

Yuichi Handa

Jun Nitta

Hidetoshi Nojiri

Kenji Saito

Nobuyoshi Tanaka

Mitsutoshi Hasegawa

Masao Majima

Michiyo Nishimura

Jun Tokumitsu

Takahiro Numai

Masahiro Okuda

Hiroshi Osawa

Seiji Mishima

Shigetaro Ogura

An optical fiber apparatus includes an optical fiber, and a demultiplexing/multiplexing unit for demultiplexing or multiplexing at least a light wave of at least a wavelength with a sufficiently narrow wavelength spectrum that is determined by a resolving power thereof, such as a Fabry-Perot etalon. The demultiplexing/multiplexing unit is provided or formed directly on at least an end face of the optical fiber. An optical detector array including a plurality of optical detectors for detecting demultiplexed light waves may be provided on a light emergence surface of of the demultiplexing/multiplexing unit.

Optical fiber apparatus provided with demultiplexing/multiplexing unit on fiber's end portion, optical detecting apparatus provided with demultiplexing/multiplexing unit on its light receiving surface, and optical transmission system using the same

A polarization-mode selective semiconductor laser includes a semiconductor laser structure including an active layer for generating gain spectra for the first and second different polarization modes and a diffraction grating formed with a uniform pitch over the laser structure. The laser structure includes a first DFB reflector portion with a first channel stripe and a second DFB reflector portion with a second channel stripe connected to the first stripe channel. The first DFB reflector portion and the second DFB reflector portion is serially arranged in a cavity direction of the laser. The first and second stripe channels are bent relative to each other such that a Bragg wavelength for the first polarization mode is coincident with a gain peak wavelength for the first polarization mode in the first DFB reflector portion, to make the first polarization mode dominant in the first DFB reflector portion, and that a Bragg wavelength for the second polarization mode is coincident with a gain peak wavelength for the second polarization mode in the second DFB reflector portion, to make the second polarization mode dominant in the second DFB reflector portion.

Polarization-mode selective semiconductor laser with a bending channel

A diffraction grating includes first regions for mainly reflecting first polarized light and second regions for mainly reflecting second polarized light. The first regions and the second regions are alternately arranged in a light propagation direction in a variety of manners to appropriately set its polarization-mode dependency according to need. An optical semiconductor device includes a semiconductor substrate, a laser structure and that diffraction grating formed in the laser structure. The laser structure is a distributed feedback semiconductor laser structure or a distributed Bragg reflector semiconductor laser structure formed on the semiconductor substrate.

Diffraction grating with alternately-arranged different regions, optical

A semiconductor laser that selectively performs oscillations in different polarization modes has first and second laser regions on a substrate. The first laser region exhibits a gain spectrum in which one polarization mode is dominant and the second laser region exhibits a gain spectrum in which a different polarization mode is dominant. Current injected independently into the each laser region causes polarization mode oscillation competition. One of the different polarization mode oscillations is selected by, for example, injecting a minute modulated current into at least one of the first and second laser regions.

Oscillation polarization mode selective semiconductor laser, light

A variable wavelength light source is provided with a laser of which the oscillating state can be changed over between two oscillating states accompanied by a change of an oscillation wavelength, and an optical selection element for selecting an output light in one of the two oscillating states of the laser. The optical selection element is capable of changing over which of the output lights in the two oscillating states of the laser is to be selected. Also, by using a laser in which the oscillation wavelength in the respective oscillating states can be changed, the wavelength variation ranges in the both oscillating states can be used.

Variable wavelength light source using a laser, wavelength control

A polarization-independent wavelength demultiplexing apparatus for demultiplexing a light beam of at least one predetermined wavelength, includes a first demultiplexer for demultiplexing the light beam at a predetermined wavelength to obtain a component of the light beam in a first polarization state and second demultiplexer for demultiplexing the light beam at the predetermined wavelength to obtain a component of the light beam in a second polarization state, different from the first polarization state. The first demultiplexer and the second demultiplexer are arranged in a serial manner or in a parallel manner with respect to light transmitted through the demultiplexing structure.

Demultiplexing apparatus and optical communication system using the

A first light waveguide is formed, and second and third light waveguides are respectively connected to the first light waveguide at first and second positions. A first coupler for effecting tight branching and/or combining is arranged near the first position, and a second coupler for effecting light branching and/or combining is arranged near the second position. An optical amplifier is arranged on the first light waveguide between the first and second positions for compensating for a light loss of a light wave caused by each of the first and second coupler.

Optical device with an optical coupler for effecting light branching

A semiconductor light amplifier comprises a substrate, a semiconductor activation layer formed on the substrate for propagating light, and amplifying light propagated through the activation layer which has a wavelength within a predetermined range when a current is applied thereto, an electrode for applying a current to at least a portion of the activation layer, and means for imparting a loss to the light propagated through the activation layer which has a wavelength in a portion of the predetermined wavelength range.

Method and apparatus for light amplification exhibiting a flat gain

An optical device includes a channel or three-dimensional light waveguide for propagating a light wave therethrough and an optical coupler for effecting at least one of branching and combining of the light wave by splitting a wavefront of a field distribution of the light wave. The coupler is produced by forming a portion whose reflection factor is different from the waveguide, extending in a vertical direction of the waveguide. The portion of different reflection factor is formed deep enough in the vertical direction to perform the splitting of the wavefront of the field distribution of the light wave with respect to at least a horizontal or lateral direction, or the portion of different reflection factor is formed at a flat portion of the waveguide.

Optical device with an optical coupler for effecting light

A laser light source comprises, a substrate, a channel waveguide path formed on said substrate and having an active area for generating a laser beam upon reception of energy, so as to constitute a laser resonator, a device for supplying the energy to the active area, a slab waveguide path formed on the substrate, and an extracting structure for extracting the laser beam generated in the channel waveguide path to the slab waveguide path as a beam collimated in one direction.

Laser light source for generating beam collimated in at least one

An integrated optical head includes a substrate and an optical waveguide formed on a surface of one side of a substrate. Light is directed to the optical waveguide and a grating structure is provided for deflecting light propagating in the optical waveguide toward the substrate. A distributed refractive index lens is formed in the substrate for condensing the light passing through the substrate after the deflection toward an article.

Integrated optical head

In an optical operation apparatus, a light source emits a light intensity-modulated on the basis of a first electrical signal. A modulating device receives the light from the light source and intensity-modulates the light on the basis of the first signal, and a photoelectric converting device converts the light modulated by the modulating device into a second electrical signal. These functions are carried out by any of a number of different arrangements of filter elements, and electro-optical or acoustico-optical devices can be used for intensity modulation.

Optical operation apparatus for effecting parallel signal processing by

A method of making and an element having a light waveguide in which the input-output area through which light is input or output is made into a light waveguide of a high threshold value of optical damage formed by outside diffusion of lithium oxide or by ion exchange and the optically functional portion in which the waveguide light is modulated or deflected by extraneous action is made into a light waveguide formed by diffusion of a metal of high light modulation or light deflection efficiency.

Element having light waveguides and method of making same

An integrated optical device for performing optical data processing in an integrated arrangement using an optical waveguide comprises a substrate, a slab optical waveguide provided on the substrate, a channel optical waveguide provided at a portion of the slab optical waveguide, and a grating coupler provided with a grating structure at a portion of the channel optical waveguide to optically couple the slab optical waveguide and the channel optical waveguide.

Integrated optical device

This specification discloses an integrated optical circuit element comprising a substrate, a wave guide layer formed on the substrate and having a refractive index higher than that of the substrate, and a photocoupler which is a diffraction grating pattern formed in the wave guide layer and having the same refractive index as that of the substrate. The specification also discloses a method of making an integrated optical circuit element which comprises the steps of forming a mask of diffraction grating pattern on a substrate, forming a layer having a refractive index higher than that of the substrate in a portion of the substrate which is not covered by the mask, and removing the mask.

Growing community of inventors

Atsugi, Japan

Yuichi Handa