A receiver optical sub-assembly, a combo bi-directional optical sub-assembly, a combo optical module, an optical line terminal, and a passive optical network system, where the receiver optical sub-assembly includes a first transistor-outline can, where a light incident hole is disposed on the first transistor-outline can, and where a first demultiplexer, a first optical receiver, a second optical receiver, and an optical lens combination are packaged in the first transistor-outline can.

A hermetic optical fiber alignment assembly includes a ferrule portion having a plurality of grooves receiving the end sections of optical fibers, wherein the grooves define the location and orientation of the end sections with respect to the ferrule portion. The assembly includes an integrated optical element for coupling the input/output of an optical fiber to the opto-electronic devices in the opto-electronic module. The optical element can be in the form of a structured reflective surface. The end of the optical fiber is at a defined distance to and aligned with the structured reflective surface. The structured reflective surfaces and the fiber alignment grooves can be formed by stamping.

The heat dissipation structure of a horizontal optical-communication sub-assembly is provided, which includes a T-shaped header, a circuit board and a heat-dissipating support insert. The T-shaped header includes a base and a tongue. The tongue is disposed on one side of the base and is perpendicular to the base. The base includes a first through hole and a second through hole. The first through hole is above the tongue and the second through hole is below the tongue and opposite to the first through hole. One end of the circuit board penetrates through the first through hole and disposed on the tongue. The heat-dissipating support insert includes a supporting block and an extension portion. The extension portion is disposed on one side of the supporting block and penetrates through the second through hole to extend to the bottom of the tongue.

The invention relates to the field of optical communication network modules, and provides a 4-channel CWDM QSFP optical module, comprising a QSFP base and four optical transmitting sub-devices. The four optical transmitting sub-devices are mounted on the base in parallel, and there is a gap between each of the optical transmitting sub-devices and the base. The QSFP optical module further includes CWDM optical components for multiplexing 4-channel optical signals emitted by the four optical transmitting sub-devices. The CWDM optical components comprise a single fiber pigtail for transmitting the multiplexed optical signal, the single fiber pigtail being at least partially located in the gap. The 4-channel CWDM QSFP optical module of the invention connects the four optical transmitting sub-devices with the CWDM optical components by a reasonable method of optical fiber winding, thereby solves the problem that it is difficult to achieve single-mode fiber coupling of four LDs in a small space.

There are included a CAN package (2) having a stem (22) and lead pins (23a and 23b) protruding from the stem (22), and a board (3) having pads (33a and 33b) for connecting lead pin. The CAN package (2) has a slot (222) provided in a surface of the stem (22) from which the lead pins (23a and 23b) protrude. One end of the board (3) is inserted into the slot (222), and the pads (33a and 33b) for connecting lead pin are electrically connected to the lead pins (23a and 23b).

A module for optically and structurally coupling a light diffusion optical fiber to a laser diode on a substrate in a compact module includes a fiber holder into which an exposed core of the laser extends and which is placed about the laser on a substrate such that the laser and fiber are axially aligned in butt coupled relation. A resilient strain relief housing is secured about the light receiving end of the fiber, and the fiber holder and substrate are inserted into the housing in a secured in a water sealing engagement.

An apparatus configured to function as a pluggable single-wavelength bidirectional transceiver in a switching network. The apparatus includes: a 21 fusion coupler; an input/output optical fiber, a detector optical subassembly (OSA) fiber and a laser OSA fiber all connected to the 21 fusion coupler; and a transceiver that includes a transceiver electronic circuit printed wiring board (PWB) and laser and detector OSAs electrically coupled to the transceiver electronic circuit PWB. The laser OSA includes a laser that is situated to transmit light to the laser OSA fiber, while the detector OSA includes a photodetector that is situated to receive light from the detector OSA fiber. The transceiver electronic circuit PWB also includes a multiplicity of transceiver input/output metal contacts arranged at one pluggable end of the PWB.

A transistor outline (TO) package including a header with at least one optoelectronic device. The header is bonded to a pot-shaped metal cap, which has a window that is transmissive to electromagnetic radiation, such that the at least one optoelectronic device is arranged in a hermetically sealed interior. The wall of the metal cap has at least one lateral wall portion and/or end wall portion which is thickened towards the interior compared to a portion of the lateral wall of the metal cap adjacent to the header.

A light source device is provided. The light source device includes: a ferrule which holds an optical fiber; a light-emitting element which emits laser light; and a casing which houses the ferrule and the light-emitting element such that the laser light enters the optical fiber. The casing includes a through hole from a first end face to a second end face. The through hole includes a diameter which decreases in a stepwise manner from the first end face toward the second end face. The ferrule is fitted to a small bore portion of the through hole, which is smallest in diameter. The light-emitting element is fitted to a large bore portion of the through hole, which is larger in diameter than the small bore portion.

To provide an optical module and a method for aligning the optical module with which alignment can be easily performed. An optical module includes first optical element sections and a second optical element section optically joined to the first optical element sections. Each first optical element section includes an optical conversion element, a ferrule having a distal end being in contact with and optically joined to the second optical element section, and a first optical system disposed in a position where the ferrule and the optical conversion element are optically adjusted. The second optical element section includes joining sections in contact with and joined to, in joining parts, the distal ends of the ferrules, a wavelength multiplexing optical element optically joined to the optical conversion elements, and second optical systems respectively disposed in positions where the wavelength multiplexing optical elements and the joining parts are optically adjusted.