Accelink Technologies Co., Ltd.

Qianggao Hu

Di Zhang

Liping Sun

Yanfeng Fu

Kun Qian

Shenglei Hu

Xuesheng Tang

Yi Tang

Yong Luo

Liu Yang

Hui Xie

Bo Zhang

Weidong Ma

Rui Yang

Zhilin Yuan

Yuan Zhang

Fei Liang

Leilei Hu

Li Hong Xiao

Yan Chen

Yongan Fu

Shiyu Li

Jiekui Yu

Yin Zhang

Yizong Chen

Zhaoxia Liu

Hu Zhu

Chao Luo

Qingyan Yue

Shuihua Liu

Yuanzhong Xu

Xiaoping Wu

Liyan Huang

Gang Lu

Di Li

Shuang Chen

Hehui Wu

Provided are a communication station, an optical communication system, a data transmission method, and a storage medium. The communication station is a first station including: a first reconfigurable optical add-drop multiplexing ROADM device, including a first port used to connect a cable in a first direction of a network; a second ROADM device connected to the first ROADM device and including a second port which may be used to connect a cable in a second direction of the network being different from the first direction; an optical protection device connected to each of the first and second ROADM devices and used to control the first station to transmit communication with a second station for a corresponding service in the first direction corresponding to the first ROADM device, or to transmit communication with the second station for a corresponding service in the second direction corresponding to the second ROADM device.

Communication station, optical communication system, data transmission method, and storage medium

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.

Optical module

An arrayed waveguide grating based hybrid integrated laser has an adjustable external cavity. The waveguide includes a semiconductor gain die and an optical waveguide chip. The optical waveguide chip includes an arrayed waveguide grating and an arrayed waveguide reflection-controllable component. A resonant cavity is formed by the output end reflection-controllable arrayed waveguide grating chip and the semiconductor gain die. An output wavelength of the laser can be adjusted by changing a driving condition of the reflection-controllable component. The output wavelength is determined by a center wavelength of each channel of the arrayed waveguide grating.

Arrayed waveguide grating based hybrid integrated laser having adjustable external cavity

A wavelength-tunable external cavity laser comprises a semiconductor optical amplifier chip and a laser external cavity, the laser external cavity comprising a grid filter, a phase adjustor and a silicon-based micro-ring chip, the grid filter and the silicon-based micro-ring chip constituting a wavelength-tunable optical filter which implements wavelength tuning by spectral tuning of the grid filter and/or the silicon-based micro-ring chip. A micro-ring filter in the silicon-based micro-ring chip of the tunable external-cavity laser is manufactured by adopting a mature silicon light technology, which can greatly reduce a manufacturing difficulty of the adjustable filter, and reduce the manufacturing cost of a device. An existing external-cavity adjustable technology platform may be used for smooth transition, so as to improve the degree of integration of this type of device and simplify a preparation process.

Wavelength-tunable external-cavity laser and adjustable light emission module

Embodiments of the present invention relate to method and device for measuring optical signal-to-noise ratio (OSNR). A method for measuring an OSNR of a signal of interest may comprise: obtaining spectrum of the signal of interest, the spectrum including power spectrum density distribution of the signal of interest in a channel bandwidth B; obtaining spectrum of a comparative signal that has the same spectrum characteristics as but different OSNR than the signal of interest, the spectrum including power spectrum density distribution of the comparative signal in the channel bandwidth B; and calculating the OSNR of the signal of interest by using the spectrum of the signal of interest and the spectrum of a comparative signal.

Method and device for measuring optical signal-to-noise ratio

The present invention relates to an external cavity tunable laser and a cavity mode locking method thereof. In an embodiment, an external cavity tunable laser comprises a semiconductor amplifier having a partial reflective film provided on one end and an anti-reflective film provided on the other end, a cavity mirror provided at the anti-reflective end to define an external cavity therebetween, a large-range phasing assembly and a quick phasing assembly provided to adjust the optical length of the external cavity independently, an optical power detector provided to detect the optical power of the light output from the semiconductor amplifier, and a control unit in communication with the optical power detector, the large-range phasing assembly, and the quick phasing assembly.

External cavity tunable laser and cavity mode locking method thereof

A multicast exchange optical switch includes an input port device including M input ports, an output port device including N output ports, a diffractive beam splitter, an optical focusing component, and a 1&#xd7;N array of reflective devices. The diffractive beam splitter diffracts each input signal beam from the input ports into at least N directions. The optical focusing component includes a first focusing lens and a second focusing lens. The first focusing lens focuses sub-beams from the respective input ports along the Y-axis direction having the same diffraction order. The second focusing lens focuses on the X-axis direction sub-beams from the same input port having different diffraction orders. The 1&#xd7;N array of reflective devices is provided at the focal plane of the optical focusing component and each reflective device reflects a sub-beam from any one of the input ports to any one of the output ports.

Multicast exchange optical switch

Disclosed is a method for monitoring the wavelength of a tunable laser device of user by local OLT. The method is applied to a wavelength division multiplexing passive optical network framework. The framework comprises an ONU, a first athermal array waveguide grating, a transmission optical fiber, a second athermal array waveguide grating and the OLT, which are sequentially connected. ONU comprises tunable wavelength optical transmitters. The method comprises: starting handshaking is carried out between the OLT and the ONU; and the OLT carries out wavelength drifting monitoring during operation of the ONU. Wavelength adjustment can be carried out on the multi-channel tunable laser device in an external auxiliary monitoring environment, thus channel wavelengths of the multi-channel tunable laser device can be accurately controlled, and the requirement for calibration accuracy of channels of the tunable laser device at the ONU is greatly reduced.

Method for monitoring wavelength of tunable laser on user end by optical line terminal on local end

A Raman pump laser control apparatus comprises a wavelength division multiplexer, a tap coupler, a photoelectric detector, an analog amplification processing circuit, an analog-to-digital converter, a fast Raman pump control unit, an digital-analog converter, and a Raman pump laser. The fast Raman pump control unit, after having known anticipated output light power of the Raman pump laser, based on a direct relationship between a current anticipated output light power of the Raman pump laser and input digital quantity that is needed by the digital-analog converter, uses a feedforward control mechanism so that actual output light power of the Raman pump laser fastly approximates the anticipated output light power thereof, and then synchronously combines with a feedback control mechanism so that the actual output light power of the Raman pump laser is precisely locked on the anticipated output light power, thereby achieving fast and precise control of the Raman pump laser.

Broadband tunable external-cavity laser using small MEMS mirror

A multicast optical switch based on free-space transmission comprises a 1&#xd7;M input collimator array, a light splitting device, an optical distance compensation device, a spot transformation device, a 1&#xd7;N output collimator array and a reflector array which are arranged in sequence. The 1&#xd7;N output collimator array corresponds to reflector array. The light splitting device is provided with a light splitting surface and a reflection surface, and by means of light splitting surface and reflection surface, light splitting and beam splitting of n times are carried out on input signals of 1&#xd7;M input collimator array, and then N beams of sub-signal light are generated. The optical distance compensation device compensates optical distance differences among M&#xd7;N sub-signal light beams produced by light splitting device. The M&#xd7;N sub-signal light beams are focused to be 1&#xd7;N light spots through light spot conversion device, and then 1&#xd7;N light spots are reflected to reflector array.

Multicast optical switch based on free-space transmission

An external-cavity tunable laser with a flexible wavelength grid tuning function comprises a resonant cavity, collimating lenses, an optical isolator, and an output optical fiber. The resonant cavity comprises a semiconductor gain chip, a beam expander collimating lens, a combined liquid crystal tunable filter assembly, and a reflecting mirror. A current injected to the semiconductor gain chip is converted to broadband spontaneously radiating photons through electrical-to-optical conversion, and the photons are spread along a waveguide toward two sides. A part of photons with special frequencies go back and forth multiple times in the resonant cavity to form a laser after a threshold condition is met. The laser is collimated by the collimating lens, passes through the optical isolator, is coupled by the collimating lens, and enters the output optical fiber.

External-cavity tunable laser with flexible wavelength grid tuning function

A wavelength selective switch (WSS) with hitless switching. The WSS includes the fiber collimator array, the focusing lens, collimating lens, diffraction grating, focusing lens, and attenuation reflection unit array. Each attenuation reflection unit has an interconnected transmission-type MEMS attenuator and a one-dimension MEMS reflector. The transmission-type MEMS attenuator is positioned in the front of the one-dimension MEMS reflector. The central axis of the transmission-type MEMS attenuator aligns and coincides with that of the one-dimension MEMS reflector, with the two central axes being glued together. The WSS of the present invention effectively utilizes the combination of a one-dimension reflector array and a transmission-type optical attenuator chip. With the use of one-dimension reflector array, instead of the known two-dimension reflector array, the complexity of design and manufacture is greatly reduced, thereby reducing the production costs of the switch.

WSS with hitless switching

An integrated optical-power adjustable WDM is provided, which has a plurality of channels, each channel having a first input port, a second output port and a third output port, the second output port of one channel being connected to the first output port of the next channel, the first port of each channel having a waveguide, the third port of each channel having a waveguide, each channel comprising a pair of collimating elements composed of a first collimating element and a second collimating element, a thin film filter and a tunable optical filter chip functioning as a variable optical attenuator, wherein the tunable optical filter chip is set between the thin film filter and the third output port for each channel, thereby the respective tunable optical filter chip is integrated into the corresponding internal optical path for each channel of WDM to achieve optical-power control for each channel of the WDM.

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Wuhan, China

Qianggao Hu