Nec Corporation

Subaru Corporation

Yusuke Yamauchi

Yutaka Takahashi

Shigeru Sakamoto

Yoshiyuki Kanesaka

Itsumi Suda

An optical reception apparatus () of the present invention includes: a local oscillator () outputting local oscillation light (); an optical mixer () receiving a multiplexed optical signal () and the local oscillation light, and selectively outputting an optical signal () corresponding to the wavelength of the local oscillation light from the multiplexed optical signal; a photoelectric converter () converting the optical signal () output from the optical mixer into an electric signal (); a variable gain amplifier () amplifying the electric signal () to generate an output signal () whose output amplitude is amplified to a certain level; a gain control signal generating circuit () generating a gain control signal () for controlling the gain of the variable gain amplifier (); and a monitor signal generating unit () generating a monitor signal () corresponding to the power of the optical signal () using the gain control signal ().

Optical reception apparatus and monitor signal generating method

A vehicle includes a radiator, a bypass passage, a first valve, a second valve, and a controller. Cooling water is circulated through the radiator independently of a cylinder block and a cylinder head of an engine. The radiator cools the cooling water. The cooling water is circulated through the bypass passage while bypassing the radiator. The first valve switches between an open state in which cooling water is circulated through the cylinder block and a closed state in which cooling water is not circulated through the cylinder block. The second valve receives cooling water circulated through the cylinder head and cooling water circulated through the cylinder block via the first valve. The second valve uses an intermediate opening to adjust a flow rate of cooling water circulated through the radiator and the bypass passage. The controller controls opening and closing of the first valve and the opening of the second valve.

Vehicle

To provide an optical transceiver with which a plurality of optical transmitters and receivers constituting the optical transceiver can be detached individually and exchanged/repaired easily, so that waste of components can be avoided. The optical transceiver includes: an optical transceiver main body; a plurality of pairs of optical transmitters and optical receivers housed inside the optical transceiver main body by being disposed in parallel; optical transmitter substrates and optical receiver substrates, which individually hold each of the optical transmitters and the optical receivers; an optical transceiver substrate which holds each of the optical transmitter substrates and the optical receiver substrates; and connectors which connect each of the optical transmitter substrates as well as the optical receiver substrates to the optical transceiver substrate detachably.

Growing community of inventors

Tokyo, Japan

Yusuke Yamauchi