Abstract: An optical system allows sharing of optical components and seed and pump light to achieve desired optical amplification in laser light while reducing the number of optical components and complexity of the overall optical system and achieving improved performance in lasers and reduced cost in fabrication and final lasers for large scale production of such lasers. Different optical gain sections can be used to allow for sharing of seed and pump light and sharing of optical components while providing multi-stage optical amplification.

Abstract: A test device for a TO-CAN laser includes a test socket, a coaxial waveguide substrate, and a test printed circuit board (PCB). The test socket comprises a coaxial waveguide tube accommodating a signal output pin of the TO-CAN laser and an electric-conducting slot accommodating a signal input pin of the TO-CAN laser. The coaxial waveguide substrate is respectively connected with a coaxial waveguide pin of the test PCB and the coaxial waveguide tube of the test socket. An electric-conducting slot pin of the test socket is connected with corresponding control pins of the test PCB.

Abstract: A movable system includes a movable platform that includes a motorized drive to cause the movable platform to move in position, and a compartment located in an interior part of the movable platform; and an LIDAR system mounted to the movable platform including a probe fiber laser module located on the movable platform and producing pulsed probe laser light and scan the pulsed probe laser light out for optically sensing presence of one or more objects in the surrounding area based on detection of reflected probe laser light from the one or more objects. The probe fiber laser module includes a base laser module located inside the enclosure of the compartment and remote laser modules distributed at the platform instrument holding portions to scan the pulsed probe laser light out for optically sensing presence of one or more objects in the surrounding area.

Abstract: The present disclosure provides a laser device, where the laser device comprises a substrate, a seed laser disposed on the substrate, and a radiofrequency coil. Two connection ends of the radiofrequency coil are connected with corresponding pin ends of the seed laser, respectively.

Abstract: A 4-channel parallel-optical (SR4) device for monitoring an emission power includes an emission assembly for emitting laser, a receiving assembly for receiving the laser, and a monitoring assembly for monitoring the emission power of the emission assembly. The emission assembly includes an emission chip, a first inclined mirror for total reflecting the laser, and a second inclined mirror for refracting and reflecting the laser. The receiving assembly includes a third inclined mirror or total reflecting and focusing the laser. An inner angle of the first inclined mirror is matched with an inner angle of the second inclined mirror to horizontally transmit the laser towards the optical fiber.

Abstract: A 4-channel parallel-optical (SR4) device for monitoring an emission power includes an emission assembly, a receiving assembly, and a monitoring assembly. The emission assembly includes an emission chip, a first planar groove, and a second planner groove. The receiving assembly includes a third planar groove and a receiving chip. The emission chip emits the laser to the first planar groove, the first planar groove transmits a part of the laser to the second planar groove, and the second planar groove total reflects the transmitted laser to an optical fiber. The first planar groove reflects a part of the laser to the monitoring assembly. The monitoring assembly receives the reflected laser and monitors power parameters of the reflected laser, the laser is emitted to the third planar groove through the optical fiber, the third planar groove total reflects the laser to the receiving chip, and the receiving chip receives the laser.

Abstract: An optical comb filter, comprising an input/output collimator (50), an output collimator (60), a spectroscope (10), and first, second and third GT resonant cavities (20, 30, 40), wherein each GT resonant cavity comprises a transparent solid block coated with a membrane layer and a spacing part, a through hole is provided on the transparent solid block, and the transparent solid block and the spacing part form a hollow cavity; and rectangular orientation of an insertion loss curve is realized, and the bandwidth utilization rate is high.

Abstract: The present utility model relates to the field of a QSFP+ module hot-pluggable unlocking structure. The hot-pluggable unlocking structure includes a housing formed of an upper cover and a lower cover buckled to each other, and a locking component provided on the housing, where guiding grooves are provided on two sides of the housing, two unlocking pieces are provided at one end of the locking component and a pull tab is provided at the other end, the unlocking pieces are engaged with and provided in the guiding grooves, a spring is provided on the upper cover, spring-catch elements are provided on the locking component and protrude towards the upper cover, and the spring-catch elements and the spring are pressed against each other. The structure simplifies the pull tab unlocking structure and manufacturing process thereof and helps reduce costs.

Abstract: The present patent application provides a vertical cavity surface emitting laser assembly. The vertical cavity surface emitting laser assembly includes a vertical cavity surface emitting laser, optical element and optical detector. The optical element includes an identation. A portion of the output light of the VCSEL passes through the indentation and to the optical detector to be used for power monitoring.

Abstract: A grating-type tunable filter comprises a signal input terminal, a signal output terminal, a focusing component and gratings. An input collimator, an output collimator, a first grating, a first reflector, a light beam expanding component, a second grating, a polarization rotating component and a second reflector are arranged along an optical path. Wavelength selection is realized by changing the incident angles of the first grating and the second grating by virtue of the rotatable first reflector, and the first grating is inserted among the input collimator, the output collimator and the first reflector driven by MEMS to carry out pre-dispersion.

Abstract: The present patent application discloses a single-fiber coupled multi-wavelength optical transceiver, comprising a fiber ferrule, a circulator subassembly, a multiplexer/demultiplexer subassembly, an optical transmitting subassembly and an optical receiving subassembly. The circulator subassembly comprises three ports. The optical transceiver comprises an optical receiving unit and an optical transmitting unit. The light beams of the optical receiving unit incidents from the fiber ferrule to the first port of the circulator, then output to multiplexer/demultiplexer through the second port of the circulator subassembly. The light beams is then split by the multiplexer/de-multiplexer and received by the receiver optical subassembly.

Abstract: The present patent application relates to a polarization interference optical interleaver, which includes a first port to transmit the first optical signal through the first optical path, a second port to transmit the second optical signal and a third port to transmit the third optical signal. The first optical signal passes through the first optical path and splits into the second optical signal and the third optical signal by the first and the second light splitting/combining crystals and the interference crystal group. The interference crystal group is located between the first and the second light splitting/combining crystals. The second optical signal and the third optical signal are received and reflected by a reflecting mirror. Then the second optical signal and the third optical signal output through the second port and the third port respectively.

Abstract: A free-space optical hybrid is provided. The free-space optical hybrid includes a polarizing beam splitter that split the light beams S and L into horizontal polarization light beams Sx, Lx and orthogonal polarization light beams Sy, Ly, respectively, at least one birefringent crystal splits the horizontal polarization light beams Sx, Lx and orthogonal polarization light beams Sy, Ly into light beams Sxo, Sxe, Lxo, Lxe, Syo, Sye, Lyo, Lye, a light combiner that combine the light beams Sxo+Lxo, Sxo?Lxo, Sxe+jLxe, Sxe?jLxe, Syo+Lyo, Syo?Lyo, Sye+jLye, Sye?jLye and output the light beams at ports. The present invention can realize an optical hybrid in free-space by using a birefringent crystal and can split light beams of different polarization statuses in free-space well. The optical hybrid offers a compact structure and good stability.

Abstract: The invention discloses an apparatus for enhancing the signal power to ASE power ratio in an optical amplifier including a 1×n input optical switching component, n band-pass filters, and an n×1 output optical switching component, wherein the signal power is allowed to pass through the band-pass filter switched by the 1×n input optical switching component and the n×1 output optical switching component.

Abstract: A tunable chromatic dispersion compensation device used to compensate chromatic dispersion of wavelength of at least one predetermined wavelength band of light signal is provided. The tunable chromatic dispersion compensation device comprises a chromatic dispersion compensator, and a controller. The chromatic dispersion compensator comprises at least a first chromatic dispersion compensation unit and a second chromatic dispersion compensation unit connected with the first chromatic dispersion compensation unit in series. The first chromatic dispersion compensation unit has a free spectral range, the second chromatic dispersion compensation unit has a free spectral range same as to that of the first chromatic dispersion compensation unit. Each chromatic dispersion compensation unit comprises an interference cavity. The controller comprises an inputting unit being configured for inputting a predetermined chromatic dispersion compensation information.

Abstract: The present patent application provides an interference cavity for precisely controlling an optical path including a cavity formed by two equal distance arms, wherein a positive adjusting plate and a negative adjusting plate are disposed in the interference cavity for compensating the change of a cavity length with temperature and thereby ensuring that the interference cavity length is a constant. The present patent application utilizes the matching relationship between the change of the refractive index of the positive adjustment plate with the temperature and the change of the refractive index of the negative adjusting plates with the temperature to make the optical path difference OPL invariant with changes in the environment temperature and thereby to ensure the precision of the optical path.

Abstract: The present patent application provides a low power consumption pump driving circuit including a laser cooling chip, a PMOS transistor, a NMOS transistor, a LC filter circuit, a laser, and a voltage sampling circuit. The pulse width modulating signal generated by the laser cooling chip and the control terminal of the PMOS transistor are connected to the gate of the PMOS transistor. The source of the PMOS transistor is connected to a power supply. The drain of the PMOS transistor is connected to the LC filter circuit. The other terminal of the LC filter circuit is connected to the anode of the laser. The cathode of the laser is connected to the drain of the NMOS transistor. The source of the NMOS transistor is connected to the ground. One terminal of the voltage sampling circuit is connected to the laser. The other terminal of the voltage sampling circuit is connected to the laser cooling chip.

Abstract: A tunable filter is provided.

Abstract: A method for acquiring spectrum shape of a gain flattening filter of a doped optical fiber amplifier comprises the steps of: measuring spectrum shapes at two gain point (H, L) of the doped optical fiber with invariable fiber length respectively; and acquiring various gain spectrums of the doped optical fiber with various fiber length and various population inversion level according to an expression: ErGain(?,x,L?)=[ErLGain(?)+[ErHGain(?)?ErLGain(?)]*x]*L?, Wherein Gain(?) refers to the spectral function of gain, x is ??inv/?inv which refers to change of population inversion level, and L? is set as proportion of doped fiber length. Gain spectrums of the doped optical fiber with various fiber length can be acquired by measuring spectrum shapes at two gain point (H, L) of the doped optical fiber in invariable fiber length and applying change rule of gain spectrum of the doped optical fiber in different population inversion level, which improves the flexibility for design of amplifier.

Abstract: A tunable filter is provided.