Sumitomo Electric Industries, Limited

Tomoyuki Funada

Naruto Tanaka

Daisuke Umeda

Hiromi Kurashima

Hiroshi Murata

Kazushige Oki

Masaki Furumai

Shojiro Kiyotake

Kou Nito

Yoshiki Kuhara

Yasunori Murakami

Daisuke Kawase

Keisuke Jinen

An optical receiver module which receives a first optical signal including a continuous signal or a burst signal includes: a variable optical attenuator which adjusts the first optical signal to output a second optical signal; a semiconductor optical amplifier which amplifies the second optical signal to output a third optical signal; and a controller which controls an output of at least one of the variable optical attenuator and the semiconductor optical amplifier so as to cause the semiconductor optical amplifier to operate in a region in which gain saturation of the semiconductor optical amplifier does not occur, on the basis of at least one of: a power obtained by suppressing an outside portion of the wavelength band of the first optical signal in the third optical signal; and a power obtained by extracting the outside portion of the wavelength band of the first optical signal in the third optical signal.

Optical receiver module, optical receiving method, optical line terminal, PON system, and optical filter

A PON system according to one manner of the present invention includes an optical line terminal (OLT), at least one optical network unit (ONU), and an optical fiber that connects the optical line terminal and the optical network unit to each other. A reception level category for categorizing a reception level in the optical network unit, of an optical signal sent from the optical line terminal through the optical fiber is set. In discovery processing for searching for and registering an unregistered optical network unit, the optical line terminal registers an optical network unit corresponding to the reception level category.

PON system, optical network unit, optical line terminal, method of registering optical network unit, and data structure

A host board for mounting an optical transceiver includes a connector that is configured to attach thereto and detach therefrom an optical transceiver having at least one lane and includes electrical contacts as many as the at least one lane, a management unit configured to receive lane information regarding the at least one lane of the optical transceiver from the optical transceiver through the connector and specify an available electrical contact, and a communication unit configured to communicate with the optical transceiver through the connector. The communication unit is configured to communicate information with the optical transceiver through the electrical contact specified by the management unit.

Host board, optical receiver, optical transmitter, optical transceiver, and method of mounting optical transceiver on host board

A configuration for receiving transmission data at multiple rates where one rate is not necessarily a multiple of another is provided. A host board includes a receiving circuit, a cross point switch, and a switch control circuit. The receiving circuit includes a receiving unit configured to receive a first data signal transmitted at a first rate, and a second receiving unit configured to receive a second data signal transmitted at a second rate different from the first rate. The cross point switch includes input terminals and output terminals. The cross point switch is configured to define a path of signal between the input terminals and the output terminals to route an input data signal to at least one of the first receiving unit and the second receiving unit.

Data receiving apparatus

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

An optical transmitter with a plurality of transmitter units each providing a Peltier device is disclosed. The Peltier devices of the invention are connected in series with respect to the driver, accordingly, even when the Peltier devices show a relative low impedance, a total load impedance viewed from the driver becomes a substantial value and the total power consumption of the transmitter may be reduced.

Optical transmitter providing a plurality of transmitter units each having a thermo-electric cooler connected in series to each other

The present invention reduces the radiation noise and the degradation of the optical waveform appeared in the output of the laser module. The laser module of the present invention comprises the laser diode, the photodiode, and the resistor, which are mounted on the stem of the laser module. The stem includes four lead terminals, one of which is commonly connected to the laser diode ad the photodiode via the resistor. Therefore, the leak of the modulation current applied to the lead terminal, to which the laser diode and the photodiode are commonly connected, may be reduced.

Semiconductor laser module improved in high frequency response

The present invention is to provide an intelligent pluggable transceiver improving an EMI tolerance with a simple mechanism. The optical transceiver of the invention comprises upper and lower housings (), a holder (), optical assemblies (), a cover (), a substrate () and a grip (). The optical assemblies are fixed with the upper and lower housings together with the holder with interposing the conductive elastic member. Although the rear end of the substrate exposes outside the transceiver, the shield gasket and the ground pattern on the substrate shields the contact portion between the substrate and the upper housing and between the substrate and the cover. Moreover, the grip and the latch lever installed in the lower housing, and the elastic piece realize the latching/releasing mechanism of the transceiver with the host system.

Intelligent pluggable optical transceiver

The present invention is to provide an intelligent pluggable transceiver improving EMI tolerance with a simple mechanism. The optical transceiver of the invention includes upper and lower housings, a holder, optical assemblies, a cover, a substrate and a grip. The optical assemblies are fixed with the upper and lower housings together with the holder by interposing a conductive elastic member. Although the rear end of the substrate is exposed outside of the transceiver, the shield gasket and the ground pattern on the substrate shield the contact portion between the substrate and the upper housing, and between the substrate and the cover. Moreover, the grip and the latch lever installed in the lower housing, and the elastic piece realize the latching/releasing mechanism of the transceiver with the host system.

Pluggable optical transceiver with highly shielded structure

The present invention provides a semiconductor laser module in which parasitic inductance due to the bonding wire is removed, accordingly, the high frequency performance thereof can be enhanced. The laser module of the present invention has a sub-mount, on which the semiconductor laser diode is installed and transmission lines for supplying the signal to the laser diode is formed. The transmission lines on the sub-mount are directly connected to corresponding lead pins provided in the base of the package without any bonding wires. Between the lead pins and under the sub-mount is provided a photo diode for monitoring light emitted from the laser diode.

Semiconductor laser module having a co-axial package and transmission lines for complementary driving signal

A semiconductor laser module has a stem base and a stem block provided thereon. A submount is fixed on the block, and a laser diode (LD) is mounted on the submount. Transmission lines are formed on the submount and connected to the anode and cathode of the LD. Lead pins extend through the stem base to be connected to the transmission lines. A photodetector is disposed, below the LD, on the stem base. Aperture for placement of the photodetector is formed in the submount, and the photodetector is placed at least partially in this aperture.

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Osaka, Japan

Tomoyuki Funada