Abstract: A bidirectional optical subassembly, an optical transceiver including the same, and methods of making and using the same are disclosed. The optical subassembly includes a photodiode configured to receive an incoming optical signal, a transmitter configured to transmit an outgoing optical signal, and a passive optical signal processing unit including a filter and a mirror. The filter is at a first predetermined angle relative to an optical path of the outgoing optical signal and is configured to (i) reflect one of the outgoing optical signal and the incoming optical signal and (ii) allow the other of the outgoing optical signal and the incoming optical signal to pass through. The mirror is configured to reflect the one of the outgoing optical signal and the incoming optical signal at a second predetermined angle. The first predetermined angle is adapted to reduce filter insertion losses.

Abstract: Embodiments of the disclosure pertain to an electromagnetic interference shielding device comprising a base plate, first and second lateral plates connected and oriented orthogonally to the base plate, and at least one top plate connected to and oriented orthogonally to the first and second lateral plates, and a method of manufacturing such an electromagnetic interference shielding device. The top plate(s) further include (i) first and second front or side bends extending toward the base plate from a first side of the top plate(s) and (ii) first and second rear bends extending toward the base plate from a second side of the top plates. The second side of the top plate(s) is different from the first side.

Abstract: The present invention relates to an optical module and optical module system using the same. The optical module comprises a transceiving unit, an antenna and an MCU. The transceiving unit receives control commands from one or more control computers via the antenna and transfers them to the MCU. Then the MCU processes the control commands and provides feedback information to the one or more control computers through the transceiving unit. In the optical module of the present invention, as a result of an additional IOT wireless unit, the optical module is capable of communicating with remote control computers, thereby achieving remote testing and control for optical modules, instead of using conventional control methods for optical modules.

Abstract: The present disclosure relates to a latch fitting, a de-latching mechanism and an optical module using the same. The latch fitting includes a tapered end, a latch body and a latch tail in serial connection. The latch body includes a spindle. The latch body can rotate around the spindle. The latch tail comprises a first de-latching portion configured to de-latch the optical module by sliding movement. The present latch fitting, de-latching mechanism and optical module provide multiple de-latching methods with an easy and simple operation. Also, the present latch fitting and de-latching mechanism provide an improved solution for preventing optical modules from being damaged relative to conventional de-latching methods.

Abstract: An optical-to-optical (O2O) signal path, O2O and hybrid transceivers including the same, a network system or device including one or more of the transceivers, and methods of making and using the same are disclosed. The O2O signal path generally includes first and second ports and an optical amplifier configured to receive an optical signal from a host or a network through the first port and provide an amplified optical signal for the other of the host and the network through the second port. In some examples, the O2O signal path further includes one or more optical isolators and/or clock and data recovery functions. The optical signals in the O2O signal path are processed entirely in the optical domain. The transceiver includes the O2O signal path and may include an optoelectronic signal path, a pass-through connector, or a second O2O signal path.

Abstract: Optical multiplexers, optical demultiplexers, optical modules including the same, and methods of making and using the same are disclosed. The optical multiplexers include first and second structural blocks and a beam combiner. The first and second structural blocks each include at least one mirror and at least one filter, and are configured to combine a plurality of individual optical signals into a multi-channel optical signal. The beam combiner includes one or more mirrors and one or more filters, and is configured to combine the multi-channel optical signals into a further multi-channel optical output signal having the same number of channels as the multi-channel optical signals. The optical demultiplexers are structurally similar to the optical multiplexers, but provide a complementary or reverse function.

Abstract: An optical transceiver and a method of making the same. The optical transceiver includes a base/housing having a roughened or darkened optics mounting surface, a transmitter optical subassembly (TOSA), a receiver optical subassembly (ROSA), a beam splitter mount secured to or mounted on the roughened or darkened optics mounting surface, a beam splitter secured to or mounted on the beam splitter mount, and an optical fiber adapter. The TOSA includes a laser diode configured to convert a received electrical signal to an outgoing optical signal. The ROSA includes a photodiode configured to convert a received optical signal to an outgoing electrical signal. The beam splitter is transparent to one of the outgoing and received optical signals and is configured to reflect the other. The optical fiber adapter is configured to hold an optical fiber that receives the outgoing optical signal and provides the received optical signal.

Abstract: An optical or optoelectronic receiver, an optoelectronic transceiver including the same, and a method and system for protecting a photodetector in the same are disclosed. The method of protecting a photodetector generally includes providing a control voltage to the photodetector so that a current flows through the photodetector, and determining that a transient event has occurred or a transient state exists in the receiver. During the transient event or transient state, the method maintains the control voltage at a normal operating voltage when the current through the photodetector is at or below a predetermined threshold current, and switches the control voltage to a safe mode voltage when the current through the photodetector is above the predetermined threshold current.

Abstract: An optical transmitter including first, second, third and fourth signal generators configured to transmit first, second, third and fourth optical signals, a first filter configured to combine the first optical signal with the second optical signal to form a first multi-channel signal, a second filter configured to combine the third optical signal with the first multi-channel signal to form a second multi-channel signal, and a third filter configured to combine the fourth optical signal with the second multi-channel signal to form a third multi-channel signal. The first optical signal and the third optical signal have parallel optical axes, as do the second optical signal and the fourth optical signal. The second and fourth optical signals are at an angle of from 5° to 40° with respect to the first and third optical signals and are generally propagated in an opposite direction from the first and third optical signals.

Abstract: An optical subassembly, optical or optoelectronic receivers and transceivers including the same, and methods of making and using the same are disclosed. The optical subassembly includes a mirror configured to reflect an incoming optical signal at a first predetermined angle, a lens configured to receive the incoming optical signal from the mirror and focus the incoming optical signal onto a target, and an optical mount comprising at least one first surface configured to support the mirror, at least one second surface configured to support and/or secure the lens at a second predetermined angle, and a structural block configured to position and/or arrange (i) the at least one first surface at a third predetermined angle related to the first predetermined angle and (ii) the at least one second surface at the first and/or second predetermined angle. The first and/or second predetermined angle(s) are adapted to reduce a reflectance of the incoming optical signal.

Abstract: A latch fitting, a (de)latching mechanism, and an optical transceiver including the same are disclosed. The latch fitting includes a latch body, a catch extending from a first end of the latch body, a latch tail extending from an opposite end of the latch body, first and second wings extending from the latch body in opposite or complementary directions, and a spindle around which the latch fitting is rotatable. The latch tail is configured to engage with a latch handle to latch and de-latch the optical transceiver. Thus, the (de)latching mechanism includes the latch fitting and the latch handle. The present latch fitting, (de)latching mechanism and optical transceiver are more robust and less susceptible to damage than conventional latch fitting, (de)latching mechanisms, and optical transceivers.

Abstract: An optical or optoelectronic receiver and module, and methods of making and using the same, are disclosed. The receiver includes a photodetector, a first microelectromechanical device configured to reflect a multi-wavelength optical signal, a thin film filter configured to receive the multi-wavelength optical signal reflected by the first microelectromechanical device and separate a single-wavelength optical signal from the multi-wavelength optical signal, a first lens configured to focus the single-wavelength optical signal on the photodetector, and a second microelectromechanical device configured to reflect the single-wavelength optical signal towards the first lens. Each wavelength of the multi-wavelength optical signal represents or corresponds to a unique channel over which the receiver receives optical signals. The present receiver and methods enable low-cost, high-volume manufacturing of multi-channel optical or optoelectronic receivers.

Abstract: An optical or optoelectronic receiver and module, and methods of making and using the same, are disclosed. The receiver includes a photodetector, a first microelectromechanical device configured to reflect a multi-wavelength optical signal, a thin film filter configured to receive the multi-wavelength optical signal reflected by the first microelectromechanical device and separate a single-wavelength optical signal from the multi-wavelength optical signal, a first lens configured to focus the single-wavelength optical signal on the photodetector, and a second microelectromechanical device configured to reflect the single-wavelength optical signal towards the first lens. Each wavelength of the multi-wavelength optical signal represents or corresponds to a unique channel over which the receiver receives optical signals. The present receiver and methods enable low-cost, high-volume manufacturing of multi-channel optical or optoelectronic receivers.

Abstract: An integrated lens with integrated functional optical surfaces for use in optical communication is disclosed. The integrated lens includes first and second cavities and a fiber adapter. The device also includes integrated first and second lenses. The first cavity houses one or more optical transmitting and/or receiving devices. The second cavity has a first optical surface and an optional second optical surface. The fiber adapter has the second lens. The integrated lens enables a small size, a light weight, high coupling and a high transmission efficiency, and can be produced by injection molding using a single mold. The integrated lens is applicable to optical signal coupling, fiber connections, optical modules, and optical or optoelectronic communication.

Abstract: An integrated lens with integrated functional optical surfaces for use in optical communication is disclosed. The integrated lens includes first and second cavities and a fiber adapter. The device also includes integrated first and second lenses. The first cavity houses one or more optical transmitting and/or receiving devices. The second cavity has a first optical surface and an optional second optical surface. The fiber adapter has the second lens. The integrated lens enables a small size, a light weight, high coupling and a high transmission efficiency, and can be produced by injection molding using a single mold. The integrated lens is applicable to optical signal coupling, fiber connections, optical modules, and optical or optoelectronic communication.

Abstract: A multifunctional laser driving circuit, and an optical module and method of using the same, are disclosed. The circuit combines first and second optical signals having different functions to form a compound signal, and switches among the first optical signal, second optical signal and compound signal by enabling or disabling first and second laser drivers corresponding to the first and second optical signals. The circuit can provide functions to optical modules, including converting an electrical data signal into an optical data signal; converting an electrical line monitoring signal into an optical line monitoring signal; combining the optical data and line monitoring signals and synchronously transmitting them to a fiber; and providing an OTDR function. Relative to using external OTDR tools to detect line faults, the present circuit and method enables simple line connection, timely detection of lines faults, and low costs of implementation.

Abstract: An EMI shielding device for an optical transceiver is disclosed. The EMI shielding device includes a shell with an optical and electrical interfaces al opposed ends. The shell includes a base and an upper cover. The upper cover includes a plate having at least two flanks, each having a lateral plate that extends downward. The base includes a base plate having at least two flanks, each having a base side baffle. The upper covet plate is located between the base side baffles. The lower ends or surfaces of the upper cover lateral plates have serrations thereon. A conductive gasket under the serrations contacts the base. The conductive gasket and the serrations result in reliable multipoint contact between the upper cover lateral plates and the base, thereby providing reliable electrical continuity between the upper cover and the base, and reducing electromagnetic leakage.

Abstract: An N×N parallel optical transceiver includes a printed circuit board, a laser driving control chip, one or more lasers, two GRIN lenses, an optical band-pass filter, a multimode fiber array and a photodiode array. In the transmitter, laser beams of the same wavelength simultaneously output from the laser chip are first focused by the first GRIN lens, then the beams pass through a wavelength band-pass filter and are refocused by the second GRIN lens, and enter the channels in the multimode fiber array. In the receiver, laser beams of a different wavelength from the multimode fiber array are focused by the second GRIN lens, then reflected by the band-pass filter, refocused by the second GRIN lens, and received by the photodiode array. The multi-channel parallel transceiver has a small form, and can integrate a DFB or FP laser chip and GRIN lenses.

Abstract: An EMI shielding device for an optical transceiver is disclosed. The EMI shielding device includes a shell with an optical and electrical interfaces al opposed ends. The shell includes a base and an upper cover. The upper cover includes a plate having at least two flanks, each having a lateral plate that extends downward. The base includes a base plate having at least two flanks, each having a base side baffle. The upper covet plate is located between the base side baffles. The lower ends or surfaces of the upper cover lateral plates have serrations thereon. A conductive gasket under the serrations contacts the base. The conductive gasket and the serrations result in reliable multipoint contact between the upper cover lateral plates and the base, thereby providing reliable electrical continuity between the upper cover and the base, and reducing electromagnetic leakage.

Abstract: A dual-rate power point compensating circuit, comprising a microprocessor and a transmitter optical subsystem assembly (TOSA), wherein the TOSA includes a laser connected to a laser driver, a monitor photodiode (MPD) connected to the laser driver, and a current divider connected to the microprocessor and the MPD. When a feedback current from the MPD exceeds the adjustable and/or operating range of the laser driver, the feedback current is reduced so that it is kept in the adjustable and/or operating range of the laser driver. The laser driver determines the optical output power of the laser from the value of the reduced feedback current. The circuit and method extend the adjustable and/or operating range of a laser driver and enable it to regulate a target optical output power of the laser with a broad testing range and high accuracy when the feedback current is relatively high.