An object is to provide a monitoring signal light output apparatus capable of transmitting a monitoring signal light with a simple configuration. An optical demultiplexer (11) is inserted into an optical fiber (F1) and demultiplexes a monitoring signal light (M1) transmitted through the optical fiber (F1). A SOA (13) amplifies and modulates the monitoring signal light (M1) separated by the optical demultiplexer (11). A control unit (15) outputs a signal (S1) indicating a state of a submarine apparatus. A SOA drive unit (14) outputs a drive signal (S2) to the SOA (13) in response to the signal (S1) to perform a modulation operation of the monitoring signal light (M1). An optical multiplexer (17) multiplexes the monitoring signal light (M1) amplified and modulated by the SOA (13) into the signal light transmitted by the optical fiber (F1). The monitoring signal light output apparatus is mounted on the submarine apparatus.

A system and method for performing an in-service optical time domain reflectometry test, an in-service insertion loss test, and an in-service optical frequency domain reflectometry test using a same wavelength as the network communications for point-to-point or point-to-multipoint optical fiber networks while maintaining continuity of network communications are disclosed.

An optical signal processing method, a control unit, an optical transmission unit and a storage medium are disclosed. The optical signal processing method includes: acquiring an OSNR value from an optical receiving unit (S100); acquiring a spectrum shaping adjustment parameter according to the OSNR value (S200); and sending the spectrum shaping adjustment parameter to an optical transmission unit to adjust a filtering parameter of a shaping filter of the optical transmission unit, so that the optical transmission unit adjusts a spectrum waveform of an optical signal by utilizing the shaping filter after adjustment (S300).

This application discloses an optical network system, a management device, an optical transmission apparatus, and a communications device, and belongs to the field of optical network technologies. A first communications device in the optical network system is configured to send physical information of the first communications device to a second communications device, where the physical information includes first module information of a first optical transmission apparatus. The second communications device is configured to determine a working status of the optical network system based on the first module information, second module information of a second optical transmission apparatus, and link information of an optical fiber link.

A network or system in which a hub or primary node may communicate with a plurality of leaf or secondary nodes. The hub node may operate or have a capacity greater than that of the leaf nodes. Accordingly, relatively inexpensive leaf nodes may be deployed to receive data carrying optical signals from, and supply data carrying optical signals to, the hub node. One or more connections may couple each leaf node to the hub node, whereby each connection may include one or more spans or segments of optical fibers, optical amplifiers, optical splitters/combiners, and optical add/drop multiplexer, for example. Optical subcarriers may be transmitted over such connections, each carrying a data stream. The subcarriers may be generated by a combination of a laser and a modulator, such that multiple lasers and modulators are not required, and costs may be reduced. As the bandwidth or capacity requirements of the leaf nodes change, the number of subcarriers, and thus the amount of data provided to each node, may be changed accordingly. Each subcarrier within a dedicated group of subcarriers may carry OAM or control channel information to a corresponding leaf node, and such information may be used by the leaf node to configure the leaf node to have a desired bandwidth or capacity.

Embodiments of the present disclosure provide an optical signal transmission method, apparatus, and device. The method at a first device side comprises: n first colored optical modules respectively transmit optical signals with the frequency being f and the wavelengths respectively being λ1-λn, wherein λ1-λn are different from each other; and in-band optical layer operation, administration, and maintenance (0AM) information with the modulation frequency being k1-kn is separately superimposed on the optical signals with the wavelengths respectively being λ1-λn.

An extinction ratio testing system (10) includes a microcontroller (102), an extinction ratio tester (104), and a thermostat (106). The microcontroller (102) controls the thermostat (106) to maintain an optical transceiver module (20) at a predetermined high temperature, and then the microcontroller (102) controls the extinction ratio tester (104) to test an extinction ratio of the optical transceiver module (20). If the extinction ratio is lower than a standard extinction ratio, the microcontroller (102) controls the optical transceiver module (20) to increase a laser operating current (212) of the optical transceiver module (20) to increase the extinction ratio.

In an optical fiber monitoring system which detects physical disturbance or other parameters such as temperature or strain of a fiber where a monitor signal is transmitted along the optical fiber and analyzed to detect changes which are indicative of an event, a method is provided for periodically checking proper operation of the optical fiber monitoring system. :A fiber disturbance actuator periodically causes a pattern of disturbances of a portion of the fiber at a predetermined location thereon where the disturbance is characteristic of the event to be monitored. The monitor signal is analyzed to detect the pattern of changes and in the event that expected changes are not detected, a warning is issued that the intrusion detection system is not properly operating.

A network or system in which a hub or primary node may communicate with a plurality of leaf or secondary nodes. The hub node may operate or have a capacity greater than that of the leaf nodes. Accordingly, relatively inexpensive leaf nodes may be deployed to receive data carrying optical signals from, and supply data carrying optical signals to, the hub node. One or more connections may couple each leaf node to the hub node, whereby each connection may include one or more spans or segments of optical fibers, optical amplifiers, optical splitters/combiners, and optical add/drop multiplexer, for example. Optical subcarriers may be transmitted over such connections, each carrying a data stream. The subcarriers may be generated by a combination of a laser and a modulator, such that multiple lasers and modulators are not required, and costs may be reduced. As the bandwidth or capacity requirements of the leaf nodes change, the number of subcarriers, and thus the amount of data provided to each node, may be changed accordingly. Each subcarrier within a dedicated group of subcarriers may carry OAM or control channel information to a corresponding leaf node, and such information may be used by the leaf node to configure the leaf node to have a desired bandwidth or capacity.

An optical multiplexer/demultiplexer according to an example embodiment includes: an OCM configured to measure a strength of each of optical signals in a plurality of wavelength bands input to a WSS and to determine an optical signal wavelength band and a noise wavelength band based on the measured strengths; the OCM configured to pass the optical signal in the optical signal wavelength band determined by the OCM as a primary signal; a dummy light generation unit configured to generate dummy light in which the optical signal wavelength band has been extinguished; and an optical coupler configured to multiplex the primary signal output from the WSS with the dummy signal into a wavelength division multiplexing optical signal and to output the wavelength division multiplexing optical signal to an optical transmission path.