A control device of a micro-ring optical switch. An optical signal is sent to a spectrum detection unit (2) after being processed by a micro-ring optical switch unit (1), the spectrum detection unit (2) detects spectrum changes and conducts photoelectric signal conversion, electrical signals output by the spectrum detection unit (2) sequentially pass through a digital signal processing unit (3) and a drive signal generation unit (4) to generate appropriate drive signals, and micro-ring optical switch driving and temperature control over a chip are completed through a drive unit (5). In this way, no cryogenic temperature compensation is needed by the micro-ring optical switch, the defect that the micro-ring optical switch deteriorates when affected by temperature drifting is overcome, and the process requirements for manufacturing are lowered at the same time, and the present invention can be applied to a high-speed switching network.

Control device of micro-ring optical switch

Two-in-parallel high birefringence optical fiber sagnac interference ring multi-parameter sensor

The invention discloses a passive optical network system based on Nyquist wavelength division multiplexing and a realization method. The system comprises an OLT (optical line terminal) and N ONUs(optical network unit), wherein the OLT is provided with a multi-carrier generation device and one three-port optical circulator; the multi-carrier generation device generates N paths of optical carriers with an equal frequency interval; N paths of downlink Nyquist wavelength division multiplexing signals are sent to the ONUs via a downlink feed line optical fiber; the three-port optical circulator transmits the N paths of optical carriers to the ONUs via an uplink feed line optical fiber for uplink modulation; and an uplink Nyquist wavelength division multiplexing signal from the ONUs is transmitted to the OLT via the uplink feed line optical fiber. According to the passive optical network system and the realization method., uplink and downlink both adopt the Nyquist wavelength division multiplexing technology, the advantage of WDM-PON (wavelength division multiplexing-passive optical network) is kept, the servable user amount is greatly increased by utilizing the high spectrum efficiency of the WDM-PON, and realization is simple.

Passive optical network system based on Nyquist wavelength division multiplexing and realization method

Light-source-shared WDM-PON (wavelength division multiplexed passive optical network) system based on suppressed carrier modulation technique

The invention provides a wavelength division multiplexing OFDM-PON transmission system based on remote difference frequency detection. The system comprises an optical line terminal, a feed-in type optical fiber network, a far-end node, multiple distribution type optical fiber networks and multiple optical network units which are connected in turn. The optical network units are used for processing a downlink OFDM signal and extracting a specific X-polarized optical carrier used for modulating an uplink OFDM signal. Heterodyne detection of the downlink OFDM signal and a downlink local oscillator optical signal is realized by the optical network units, and the uplink OFDM signal is outputted to the far-end node and the optical line terminal via the distribution type optical fiber networks simultaneously. The optical line terminal receives the uplink OFDM signal and performs self-homodyne detection on the uplink OFDM signal. With adoption of an OFDM and WDM reuse mode, effective transmission channels and data transmission rate are increased so that larger transmission capacity is realized. Meanwhile, receiving sensitivity is enhanced by adopting the difference frequency detection technology so that transmission in longer distance is realized.

Wavelength division multiplexing OFDM-PON transmission system based on remote difference frequency detection

The invention relates to a temperature-compensated optical fiber sagnac interference ring strain sensor in the technical field of optical fiber sensing, which comprises an Hi-Bi sagnac interference ring, an optical fiber micro-ring resonator, an optical precision displacement platform, a light source and a spectrum analyzer, wherein the light source is connected with the optical fiber micro-ring resonator, the Hi-Bi sagnac interference ring is connected with the optical fiber micro-ring resonator, the optical fiber micro-ring resonator is connected with the spectrum analyzer, and the Hi-Bi sagnac interference ring is arranged on the optical precision displacement platform; the Hi-Bi sagnac interference ring comprises a coupler, a polarization controller and a birefringent optical fiber, wherein the birefringent optical fiber is used as a sensing arm and simultaneously placed in a temperature field and a strain field; and the optical fiber micro-ring resonator comprises a substrate and a polymer optical fiber ring, wherein the polymer optical fiber ring is only placed in the temperature field for temperature compensation The invention effectively solves the cross sensitivity problem of the temperature and the strain and has small size, simple structure, low cost and high measuring sensitivity

Temperature-compensated optical fiber sagnac interference ring strain sensor

The invention discloses a self-excitation multi-wavelength dynamically dispatched optical network unit in passive optical network, belonging to the technical field of optical communication. The optical network unit comprises an uplink data transmitter, a downlink data receiver and a first optical circulator, wherein the output end of the first optical circulator is connected with the downlink data receiver for transmitting downlink data optical signals; the input end of the first optical circulator is connected with the uplink data transmitter for transmitting uplink data optical signals; and the uplink data transmitter comprises a FP multi-longitudinal mode laser, an adjustable band-pass filter, an optical splitter/coupler and an optical reflection ring. In the invention, multi-wavelength dynamically modulated uplink optical carrier is generated based on the self-excitation working mode of the FP multi-longitudinal mode laser, thereby greatly increasing the uplink transmission bandwidth, flexibly and effectively sharing all uplink wavelength resources, improving the use ratio of the uplink wavelength resource, ensuring simple structure and low cost, according with the requirement of colourless transmission of the optical network unit and meeting the development requirement of dramatically increased uplink access ability for users.

Self-excitation multi-wavelength dynamically dispatched optical network unit in passive optical network

The invention discloses a subcarrier multicasting transmission system in a wavelength division multiplexing passive optical network, which comprises an optical line terminal, two feed-in line optical fibers, a remote node, a plurality of distribution line optical fibers and a plurality of optical network units. The remote node comprises a second arrayed waveguide grating and a third arrayed waveguide grating, wherein the optical line terminal is connected to the input port of the second arrayed waveguide grating of the remote node through the first feed-in line optical fiber, the output port of the second arrayed waveguide grating is connected to the input port of the optical network unit of a corresponding wavelength channel, the output port of the optical network unit is connected to the corresponding input port of the third arrayed waveguide grating of the remote node, and the output port of the third arrayed waveguide grating is connected to the optical line terminal through the second feed-in line optical fiber. As the output of a switch-controlled multicasting subcarrier emitter, the invention realizes dynamic and rapidly-adjustable multicasting services, omits the liquid source required by the uplink transmission, lowers the power and saves the cost.

Subcarrier multicasting transmission system in wavelength division multiplexing passive optical network

The invention discloses a wavelength division multiplexing passive optical network system supporting a deflection routing multicast function in the technical field of optical communication, which comprises an optical line terminal, two feed line optical fibers, a remote end node, a plurality of uplink distribution line optical fibers, a plurality of downlink distribution line optical fibers and aplurality of optical network units, wherein the optical line terminal comprises a dynamic wavelength reflector which comprises three optical circulators, a phase modulator and an optical power divider, or comprises the three optical circulators, an optical attenuator, a semiconductor optical amplifier and the optical power divider. The wavelength division multiplexing passive optical network system dynamically controls a transmission path of a downlink light carrier and the orthogonal superposition of multicast data on the same wavelength through the dynamic wavelength reflector, has a simplestructure and is easy for configuration; besides, by scheduling the optical power of a baseband into a light carrier of uplink data, the wavelength division multiplexing passive optical network system saves a light source needed by uplink transmission, reduces the power, saves the cost, and increases the service diversity of a broadband access network.

Wavelength division multiplexing passive optical network system supporting deflection routing multicast function

The invention discloses a mixed passive optical network system and a transmission method thereof in the technical field of fiber optical communication The mixed passive optical network system comprises an optical circuit terminal, an optical code division multiplexing coder/decoder, an optical multiplexer/de-multiplexer, feeder line optical fiber, a remote node and optical network units, whereinthe output port of the optical circuit terminal is connected with the corresponding optical code division multiplexing coder/decoder, and the output of the optical code division multiplexing coder/decoder and the output of another optical code division multiplexing coder/decoder together enter the feeder line optical fiber through the optical multiplexer/de-multiplexer for transmission; after being transmitted to another optical multiplexer/de-multiplexer, optical signals are transmitted into the input port of other optical multiplexer/de-multiplexer; and after coding/decoding, the optical signals enter the remote node to be transmitted to each corresponding optical network unit In the invention, the optical circuit terminal and the optical network unit structure of the transitional passive optical network does not need changing, the optical code division multiplexing coder/decoder has transparent signal format for the transmitted signals, and transparent capacity expansion and smooth updating of the system can be realized

Min Zhu

Papers

Temperature-compensated optical fiber sagnac interference ring strain sensor

Self-excitation multi-wavelength dynamically dispatched optical network unit in passive optical network

Subcarrier multicasting transmission system in wavelength division multiplexing passive optical network

Wavelength division multiplexing passive optical network system supporting deflection routing multicast function

Mixed passive optical network system and transmission method thereof