CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority from Japanese Patent Application No. 2020-013912, filed on Jan. 30, 2020, the entire subject matter of which is incorporated herein by reference.

TECHNICAL FIELD

An aspect of the present disclosure relates to an optical transceiver

BACKGROUND

Japanese Patent Application Publication No. 2013-257461 discloses an optical module including a housing, an external connecting optical connector, an optical filter, a first substrate, a second substrate, a fiber-housing tray disposed on a back surface of the first substrate, and a plurality of optical fibers. On a front surface of the first substrate, a transmitting unit including a TOSA (transmitter optical sub-assembly) for transmitting light to the outside of the optical module and a receiving unit including a ROSA (receiver optical sub-assembly) for receiving light from the outside of the optical module are provided. The plurality of optical fibers includes the optical fiber extending to the ROSA from a reception terminal of the external connecting optical connector, the optical fibers extending from each of a plurality of the TOSAs to the optical filter, and the optical fiber extending from the optical filter to a transmission terminal of the external connecting optical connector. The fiber-housing tray includes a first ring and a second ring lined up in a width direction of the optical module, and the optical fibers are wound around each of the first ring and the second ring.

Japanese Patent Application Publication No. 2011-118337 discloses an optical transceiver. The optical transceiver includes an optical receptacle, an optical multiplexer, an optical demultiplexer, a tray, two sets of connectors, two sets of holders, four TOSAs, four ROSAs, a circuit board, and a housing. The optical receptacle has a sleeve, and an optical fiber extends from the sleeve. Each of the optical fibers extending from each of the sleeves is connected to each of the optical multiplexer and the optical demultiplexer in an interior of the housing. The optical transceiver further includes four internal optical fibers for transmitting four channels of optical signals from the four TOSAs to the optical multiplexer and four internal optical fibers for transmitting four channels of optical signals from the optical demultiplexer to each of the four ROSAs.

Japanese Patent Application Publication No. 2015-25868 discloses an optical connection structure. The optical connection structure has an optical connector, a sleeve, and an optical plug which is an object to be connected, and the optical connector has a ferrule holding an optical fiber. The optical connection structure is a structure for optically connecting a pair of optical fibers which require adjustment of a rotational angle around an optical axis when the optical connection is performed. Each of the pair of the optical fibers is a multi-core optical fiber or a polarization maintaining optical fiber.

SUMMARY

The present disclosure provides an optical transceiver configured to be pluggable to an apparatus in a first direction. The optical transceiver includes a housing having a rectangular parallelepiped shape and an optical receptacle, the rectangular parallelepiped shape being long in the first direction, the optical receptacle being configured to be out from the apparatus when the optical transceiver is plugged to the apparatus; a plurality of optical subassemblies each having a sleeve that is long in the first direction, each of the plurality of optical subassemblies being configured to perform a photoelectric conversion between an optical signal and an electrical signal, the sleeve facing to the optical receptacle; a plurality of inner fibers each connected to the sleeve one to one; and a tray having a holding part and a guiding part, the holding part being configured to hold the plurality of optical subassemblies in line along a second direction that crosses the first direction, the guiding part being formed on both outer sides of the holding part in the second direction and a folding back area on an opposite side of the optical receptacle. The guiding part includes a pair of passage parts in the outer sides. The housing houses the plurality of optical subassemblies, the plurality of inner fibers, and the tray. Each of the plurality of inner fibers extending from the sleeve passes through one of the pair of passage parts, the folding back area, and another of the pair of passage parts in this order within the tray so as to face the optical receptacle again when the another of the pair of passage parts is closer to the sleeve than the one of the pair of passage parts, and passes through the another of the pair of passage parts, the folding back area, and the one of the pair of passage parts in this order in the tray so as to face the optical receptacle again when the one of the pair of passage parts is closer to the corresponding sleeve than the another of the pair of passage parts.

