Abstract: An optical source that implements a wavelength tunable laser diode (t-LD) and a Mach-Zehnder (MZ) modulator within a single package is disclosed. The optical source, which outputs a modulated signal beam and a local beam of a continuous wave (CW), accompanies a control circuit mounted on several circuit boards. Only one of the circuit boards is rigidly mounted on the housing of the optical source. Rest of the circuit boards is moderately fixed to the housing through the rigidly fixed circuit board to suppress stresses caused in the housing and the circuit boards when the optical source is rigidly installed in the host system.

Abstract: A pluggable optical transceiver implementing a pull-tab is disclosed. The pull-tab includes arms assembled with a body of the optical transceiver and a holder connecting the arms. The holder, which is provided in ends of the arms, provides a tab and a bridge, where the tab and the bridge form a space where an optical fiber mated with the optical transceiver is secured. The tab is dynamically engaged with the bridge after the optical fiber is set on the bridge.

Abstract: An optical transceiver that provides a plug board independent of a circuit board is disclosed. The optical transceiver further includes a holder to hold both of the plug board and the circuit board in respective positions. The holder provides a first support to support the plug board in a side thereof, and a second support to support the circuit board in a side thereof. Because the holder supports the plug board and the circuit board in respective sides thereof, the holder does not reduce a space for mounting electronic circuit on the circuit board and not interfere with the function of the plug board.

Abstract: A pluggable optical transceiver that enhances the heat dissipation function is disclosed. The optical transceiver provides the MPO connector that receives an external MT ferrule, the assembly substrate that installs a semiconductor optical device, a lens block that bends the optical axis of the semiconductor optical device by about 90°, the circuit board electrically connected to the assembly substrate, the inner fiber optically couples the MPO connector with the lens block, and the top and bottom housings that installs the MPO connector, the assembly substrate, the circuit board, and the inner fiber therein. The bottom housing mounts the circuit board, while, the assembly substrate is thermally and physically in contact to the top housing through a thermal grease.

Abstract: An optical transceiver having a bi-directional optical subassembly (BOSA) and a twin optical port is disclosed. The BOSA is installed with respect to one of the twin port, and a plug is plugged within the other of the twin port. The plug, which is made of resin material, is rigidly set in the other of the twin port and reliably prohibited from slipping out from the port.

Abstract: A pluggable optical transceiver is disclosed. The optical transceiver provides a pull-tab assembled with a body of the transceiver. The pull-tab comprises a pair of arms and a handle. The arms in an end portion thereof each provides a leg set in a guide formed in the body. Sliding the pull-tab to disengage the optical transceiver from the cage, the leg is slid within the guide to push the end portion of the arm outwardly. The handle provides in an end thereof a bar including a slope. The optical fiber pulled out from the optical connector set in the optical receptacle of the transceiver rides on the slope even when the transceiver is set in the cage by the upside-down arrangement.

Abstract: A mechanism for an optical transceiver to latch with and release from a cage is disclosed. The mechanism includes a bail rotatable around an axis and a slider linearly movable between the latching position and the releasing position. The rotation of bail is independent of the liner motion of the slider.

Abstract: An optical source that implements a wavelength tunable laser diode (t-LD) and a Mach-Zehnder (MZ) modulator within a single package is disclosed. The optical source, which outputs a modulated signal beam and a local beam of a continuous wave (CW), accompanies a control circuit mounted on several circuit boards. Only one of the circuit boards is rigidly mounted on the housing of the optical source.

Abstract: An optical transceiver adapted to an optical connector having an angled physical contact (APC) is disclosed. The optical transceiver installs an optical sub-assembly to receive an external connector. The optical sub-assembly provides an index surface that indexes the inclined direction of the end of the stub abutting against the end surface of the external connector of the type of the APC. The housing provides a saddle with a flat surface on which the index surface of the optical sub-assembly is set.

Abstract: A pluggable optical transceiver that enhances the heat dissipation function is disclosed. The optical transceiver provides the MPO connector that receives an external MT ferrule, the assembly substrate that installs a semiconductor optical device, a lens block that bends the optical axis of the semiconductor optical device by about 90°, the circuit board electrically connected to the assembly substrate, the inner fiber optically couples the WO connector with the lens block, and the top and bottom housings that installs the MPO connector, the assembly substrate, the circuit board, and the inner fiber therein. The bottom housing mounts the circuit board, while, the assembly substrate is thermally and physically in contact to the top housing through a thermal grease.

Abstract: A pluggable optical transceiver, which is to be engaged with a rail prepared in the host system, is disclosed. The optical transceiver includes a housing that encloses optical and electrical components therein, a fastening screw that screws that engages the optical transceiver with the rail, and an actuator, which moves synchronously with the rotation of the fastening screw, protrudes from the side of the housing to be latched with the rail.

Abstract: An optical transceiver that implements an inner fiber to optically connect an optical receptacle with an optical module is disclosed. The optical module in a ceiling thereof forms a gap against a printed circuit board (PCB) electrically connected with the optical module by a flexible printed circuit (FPC) board. The inner fiber is extended in a gap formed between the PCB and the FPC, or between the FPC and the ceiling of the optical module.

Abstract: A mechanism for an optical transceiver to latch with and release from a cage is disclosed. The mechanism includes a bail rotatable around an axis and a slider linearly movable between the latching position and the releasing position. The rotation of bail is independent of the liner motion of the slider.

Abstract: A pluggable optical transceiver, which is to be engaged with a rail prepared in the host system, is disclosed. The optical transceiver includes a housing that encloses optical and electrical components therein, a fastening screw that screws that engages the optical transceiver with the rail, and an actuator, which moves synchronously with the rotation of the fastening screw, protrudes from the side of the housing to be latched with the rail.

Abstract: An optical transceiver applicable to the coherent communication is disclosed. The optical transceiver includes a laser module, a transmitter module to output a transmitting signal by modulating a phase of an laser beam output from the laser module, and a receiver module to receive a receiving signal modulated in the phase thereof and extract data by multiplying the receiving signal with an laser beam output from the laser module.

Abstract: A pluggable optical transceiver is disclosed. The optical transceiver provides a pull-tab assembled with a body of the transceiver. The pull-tab comprises a pair of arms and a handle. The arms in an end portion thereof each provides a leg set in a guide formed in the body. Sliding the pull-tab to disengage the optical transceiver from the cage, the leg is slid within the guide to push the end portion of the arm outwardly. The handle provides in an end thereof a bar including a slope. The optical fiber pulled out from the optical connector set in the optical receptacle of the transceiver rides on the slope even when the transceiver is set in the cage by the upside-down arrangement.

Abstract: A pluggable optical transceiver is disclosed. The optical transceiver provides a pull-tab assembled with a body of the transceiver. The pull-tab comprises a pair of arms and a handle. The arms in an end portion thereof each provides a leg set in a guide formed in the body. Sliding the pull-tab to disengage the optical transceiver from the cage, the leg is slid within the guide to push the end portion of the arm outwardly. The handle provides in an end thereof a bar including a slope. The optical fiber pulled out from the optical connector set in the optical receptacle of the transceiver rides on the slope even when the transceiver is set in the cage by the upside-down arrangement.

Abstract: A simplified optical coupling system having two optical connectors is disclosed. The optical coupling system includes a male connector with a ferrule, a female connector with another ferrule, and a sleeve to receive the ferrules in respective ends thereof. One of connectors provides a latch and a coil spring. The latch engages with a flange of the other connector, and the coil spring put between the flange of the connector having the latch and a base of the latch to secure the engagement of the latch with the flange.

Abstract: An optical transceiver that provides a plug board independent of a circuit board is disclosed. The optical transceiver further includes a holder to hold both of the plug board and the circuit board in respective positions. The holder provides a first support to support the plug board in a side thereof, and a second support to support the circuit board in a side thereof. Because the holder supports the plug board and the circuit board in respective sides thereof, the holder does not reduce a space for mounting electronic circuit on the circuit board and not interfere with the function of the plug board.

Abstract: An optical transceiver that copes with both the enhanced heat dissipation from heat generating components and the electrical isolation of components processing faint signals from other components generating EMI noises is disclosed. The optical transceiver provides, in addition to a bottom of a frame, a bottom cover made by material with higher thermal conductivity. The former components are directly mounted on the bottom cover through openings in the frame, while, other component to be electrically isolated from the chassis are mounted by putting an insulating support between them and the bottom cover.