Sumitomo Electric Industries, Limited

Yasunori Murakami

Akira Furuya

Koichi Koyama

Hiromi Nakanishi

Shigeru Tanaka

Masayuki Nishimura

Masahiro Shibata

Hiromi Kurashima

Kazushige Oki

Masayuki Shigematsu

Tomoyuki Funada

Hideaki Kamisugi

Kouichi Koyama

Osami Kasai

Satoru Nakazawa

An optical device includes one or more optical fibers and a holder having a supporting block, a reflecting plate, and an intermediate layer. The supporting block has a first to a third end surfaces at one end. The first end surface extends from a bottom surface of the holder to claddings of the optical fibers. The second end surface extends along a first axis intersecting the first end surface. The third end surface is oblique with respect to the first axis at an angle greater than zero degrees and less than 90 degrees. The optical fibers extend in the supporting block and is exposed to the third end surface. The reflecting plate is provided on the third end surface via the intermediate layer. Light from the optical fiber passes through the third end surface which has some roughness, and is reflected by a surface of the reflecting plate.

Optical device, optical processing device, and method of producing the optical device

A method for manufacturing an optical-assembly includes the steps of preparing an optical connector including a base having an optical waveguide and a first support block holding a first optical fiber, the base having first and second end surfaces; aligning the optical connector to the optical device, the first end surface of the base facing to the optical device, the first support block being fixed to the base in a removable manner; after aligning the optical connector, fixing the base to the optical device; after fixing the base, removing the first support block from the base; after removing the first support block, re-fixing a second support block to the base, the second end surface of the base facing to the second support block. The second support block has an optical fiber and a through hole. The base has a guide pin inserted to the through hole in the re-fixing step.

Optical-assembly manufacturing method, optical assembly, and optical connector unit

An optical device comprises optical fibers and a holder. The holder includes one end portion, an other end portion, and a supporting portion extending in a direction of a first axis from the one end portion to the other end portion. The one end portion includes a first end face extending along a first reference plane intersecting with the first axis from a side of the holder to cladding regions of the optical fibers; a second end face extending along a second reference plane from the one end portion to the other end portion; and a third end face extending along a third reference plane inclined at an angle of less than 90 degrees and more than zero degrees relative to the first axis. The cladding regions of the optical fibers are disposed at the second end face. The optical fibers have respective tips disposed at the third end face.

Optical device, optical processing device, method for fabricating optical device

An optical signal processor including: optical fibers arranged in a first direction, each optical fiber having a side surface; a flexible holding member covering the side surfaces of the optical fibers; a first optical connector having a first end face and a second end face; a second optical connector having a third end face and a fourth end face; a supporting block disposed under the first optical connector; and an optical integrated circuit including optical couplers facing the third end face of the second optical connector and optical waveguides, the optical couplers being optically coupled to the optical fibers. The optical fibers extend from the second end face in a second direction. The optical fibers extend from the fourth end face in a third direction that intersects with the second direction. The flexible holding member has a bending portion located between the first optical connector and the second optical connector.

Optical signal processor and optical assembly

An optical branching/synthesizing deviceA includes an optical branching coupler groupA and an optical combiner. The optical branching coupler groupA includes a first-stage optical branching couplerthat receives a downstream optical signal Sd from an OLT deviceat light input/output end, and second-stage optical branching couplersandincluding light input/output endsandconnected to light input/output endsandof the optical branching couplerat the previous stage, respectively. A light input/output endsof the optical branching couplersandtransmit the downstream optical signal Sd to each ONU deviceand receive upstream optical signals Su from the ONU devices. The optical combiner combines the upstream optical signals Su output from the light input/output ends, andof the optical branching couplersto

Optical branching/synthesizing device

The present invention provides an optical transceiver with a function of the wavelength division multiplexing. The transceiver includes a receiver optical unit, a transmitter optical units and a substrate. Both optical unit includes a plurality of receiver optical subassemblies (ROSAs) or a plurality of transmitter optical subassemblies (TOSAs) and a plurality of wavelength selective filters. The ROSAs or the TOSAs in respective optical units is electrically connected with the circuit on the substrate by the flexible printed circuit (FPC) board with a plurality of branches, each connected to the ROSAs or the TOSAs, and a connecting portion fixed to the substrate.

Optical transceiver with a plurality of optical subassemblies electrically connected by integrated FPC board with a substrate

Optical amplifier according to the present invention is provided with an EDF, a light source device having a semiconductor laser element that generates an excitation beam and a housing that accommodates this, and an optical multiplexer having an input optically coupled with light source device, an input that receives the signal beam, and an output that provides an excitation beam and signal beam to EDF. Semiconductor laser element has an active layer, provided between cladding layers and including compound semiconductors of mutually different conductivity types, that includes a compound semiconductor and is constructed such that the oscillation wavelength at 20&#xb0; C. of this semiconductor laser element is less than 1470 nm but not less 1440 nm. If this is done, the change of gain in EDF with respect to oscillation wavelength can be made satisfactorily small and the NF can be made satisfactorily small.

Optical amplifier

The present invention relates to a WDM transmission system and the like suitable for optical communications between local stations having a relatively short repeater interval. In particular, the WDM transmission repeater employed in the WDM transmission system demultiplexes a plurality of signal lights propagating through a transmission line into first and second groups, takes out the second group, comprises a multiplexer for sending into the transmission line a new WDM signal group in which the first group thus demultiplexed and a third group of signal lights different from those of the first group are multiplexed, and has a special structure for reducing the influence of the not-demultiplexed crosstalk components within the second group upon the optical communications.

Growing community of inventors

Yokohama, Japan

Yasunori Murakami