ACCELINK TECHNOLOGIES CO., LTD.

An optical amplifier assembly and a detection method capable of dynamically performing optical time-domain reflection detection. The detection method comprises obtaining signal light intensity detection signals from a first and second photodetectors and sending a control signal to an L-band Raman pump when the signal light intensity in the second photodetector is lower than a first preset threshold, so that the L-band Raman pump enters into an optical time-domain reflection detection mode; sending a control signal to the L-band Raman pump when the signal light intensity in the second photodetector is greater than or equal the first preset threshold, so that the L-band Raman pump enters into an L-Band Raman optical fiber amplifier operation mode.

A wavelength selective switch, including: an optical fiber array, an optical signal processing device and an output selection device. The optical fiber array includes multiple dual-core optical fibers arranged in parallel, one dual-core optical fiber being used for inputting two optical signals; the optical signal processing device is located at an output end of the optical fiber array and is used for splitting the two optical signals into sub-signals of different wavelengths and projecting the sub-signals of different wavelengths to different spectral band regions in the output selection device; and the output selection device is located at the rear end of the optical signal processing device, and is used for processing the sub-signals projected to the spectral band regions, so as to respectively perform output selection on the sub-signals split from two optical signals, thereby achieving a dual-switch function.

A drive circuit for a direct modulated laser and a direct modulated optical transmitter. The drive circuit includes a service data drive unit, a voltage configuration unit, a monitoring data modulation unit, and a monitoring current generation unit. Output terminals of the voltage configuration unit and the monitoring data modulation unit are connected to a same input terminal of the monitoring current generation unit. An output terminal of the service data drive unit is connected to a current sink interface of the monitoring current generation unit, and is suitable for connecting a direct modulated laser. In the technical solution, a low-speed monitoring data signal is mixed into an average optical power signal of a high-speed service data light wave from the direct modulated laser, then is extracted from the received optical signal by a remote optical receiver, enabling the drive circuit to be remotely monitored.

Provided is a multi-channel light-receiving module, which comprises an incident collimator, a light-splitting assembly, an optical path conversion assembly and a photoelectric chip array which are arranged in sequence, wherein the light-splitting assembly comprises an inner reflector and a plurality of optical filters, and the optical filters are respectively arranged on an output end of the inner reflector; the channel interval of photoelectric chips in the photoelectric chip array is less than the channel interval of an adjacent optical filter; the optical path conversion assembly comprises a plurality of emergent collimators and an optical fiber connected to each of the emergent collimators; a plurality of paths of optical signals output by the light-splitting assembly are respectively coupled into corresponding optical fibers after passing through the plurality of emergent collimators; and the plurality of paths of optical signals are output by output ends of the plurality of optical fibers and are then coupled to the photoelectric chip array. By means of the light-receiving module, an optical path component is converted into a small channel interval of photoelectric chips from a large channel interval of optical filters, the problem of it being difficult to match the channel interval of optical filters and the channel interval of photoelectric chips is solved, the cost of photoelectric chips is reduced, and the assembly difficulty of optical filters is also reduced.

Disclosed are an optical module, an optical communication device and an optical transmission system. The optical module includes a housing; a main board where are arrange a first transmitting unit and a first receiving unit; a first optical circulator, a first port of which is connected to an output end of the first transmitting unit, and a third port of which is connected to an input end of the first receiving unit; and a first optical fiber adapter connected to a second port of the first optical circulator, wherein an optical signal from the output end of the first transmitting unit is transmitted to the second port along the first port of the first optical circulator; and the first optical fiber adapter receives an optical signal input from outside, and transmits it to the third port along the second port of the first optical circulator.

An optical-path-displacement-compensation-based emission optical power stabilization assembly, comprising: a laser, a lens, and an optical fiber coupling port disposed on a first substrate and a second substrate according to a preset arrangement scheme, wherein an expansion coefficient of the second substrate is larger than that of the first substrate, and the preset arrangement scheme enables initial distances between the laser and the lens, between the lens and the optical fiber coupling port, and/or between the laser and the optical fiber coupling port to differ from respective optical coupling distances from an optical coupling point by a preset value, thereby ensuring that a coupling loss on an optical path changes along with the temperature, forming a complementary effect with respect to an optical power-temperature curve of the laser, which reduces a temperature-caused fluctuation of the emission optical power of an optical assembly.

A multi-leaf collimator comprises a plurality of pairs of leaves, leaves of each pair being disposed oppositely from each other. Each pair of leaves comprises a first leaf and a second leaf which are configured to move oppositely relative to each other. In a first plane perpendicular to an isocenter plane of the radiotherapy apparatus and parallel to a direction of leaf movement, the first leaf and the second leaf are capable of moving to a closed position, where end surfaces of the first leaf and the second leaf are embedded with each other at the closed position.

A heating electrode for lowering stress of a light waveguide and a VOA. The heating electrode is provided on an upper cladding layer ( 04 ) of a PLC waveguide. The heating electrode is formed by combining two or more sub-heating electrodes ( 13 ) arranged at internals. Adjacent sub-heating electrodes ( 13 ) are connected by means of conductive electrodes ( 14 ) having a conductive function. By dividing a complete elongated heating electrode into a plurality of sub-heating electrodes ( 13 ), the stress exerted to a waveguide core layer is lowered without affecting the heating efficiency, and thus the reliability of optical indexes of a device is effectively improved.

An optical fiber adapter structure, comprises a metal flange, a tubular housing, an insulating ring, an optical fiber stub, and a shielding annulus. The optical fiber stub is embedded into the metal flange; the shielding annulus is fixed at a bottom of the metal flange by means of a conductive adhesive; the shielding annulus covers an end of the optical fiber stub and is provided with a reserved hole only for laser signals to pass through; the tubular housing is sleeved to the bottom of the metal flange; and the tubular housing is insulated from the metal flange by means of the insulating ring. The conductive adhesive adheres the shielding annulus made of conductive material to a tail end of the metal flange and maintains complete electrical contact therebetween, such that the electromagnetic wave radiation between the interior of optical device and the exterior of metal flange is reduced.

Provided are a method and system for controlling a Raman fiber amplifier. The method comprises: according to a target gain and a tilt, calculating an expected output power of a pump by using a feedforward formula, and obtaining an actual output power of the pump through detection ( 201 ); locking the actual output power of the pump to the expected output power through first-stage feedback control ( 202 ); according to the target gain and the tilt, calculating an expected ASE power of the pump by using an ASE formula, and obtaining an actual out-of-band ASE power of the pump through detection ( 203 ); if the out-of-band ASE is not locked, determining gain compensation and tilt compensation of the pump through second-stage feedback control, and feeding the compensation back to the feedforward formula and the ASE formula for recalculation ( 204 ); and repeatedly performing the first-stage feedback control and the second-stage feedback control until the gain and the tilt are locked ( 205 ). In the system, a combination of feedforward and multi-closed loop feedback control is used to realize rapid locking of a pump power and locking of the gain and the tilt compensation, which improves the control precision of the gain and the tilt and accelerates a response speed.