A method for estimating characteristics of an optical receiver includes: a generating process, a monitoring process, a suppressing process, a guiding process and an estimating process. The generating process generates a modulated optical signal based on an oscillation signal. The monitoring process monitors an optical spectrum of the modulated optical signal or a spectrum of an electric signal obtained by performing optical-to-electrical conversion on the modulated optical signal. The suppressing process suppresses a modulation component of an upper sideband or a lower sideband of the modulated optical signal based on the optical spectrum of the modulated optical signal or the spectrum of the electric signal. The guiding process guides the modulated optical signal in which the modulation component is suppressed to the optical receiver. The estimating process estimates the characteristics of the optical receiver based on an output signal of the optical receiver.

Techniques are provided for identifying and monitoring connections in an optical system. A plurality of optical ports is configured to receive a plurality of optical links that couple with one or more remote optical devices. At least one light source generates identification (ID) signals. At least one optical element configured to direct the ID signals into transmission paths from the source optical device to the remote optical device/s over the plurality of optical links. The remote optical device/s include one or more optical elements that direct the ID signals through a set of WDM filters and returns the ID signals. At least one optical element directs returned ID signals to an optical channel monitor. At least one microprocessor configured to execute control instructions to generate the ID signals and process one or more outputs of the optical channel monitor in response to the returned ID signals to identify the plurality of optical links.

[Problem] To allow addition of new functions to an optical module at a low cost. [Solution] An optical transceiver 11a includes a CPU 21 configured to perform download control of a program for executing an additional function to be newly added to the optical transceiver 11a, a wireless transmitting and receiving device 22 configured to receive, in accordance with the download control, the program from a terminal device 13 that stores various programs, and a memory unit 23 configured to store the program that is received. The CPU 21 is configured to perform, by interrupting a monitoring and control signal from a transmission device 12, control to write data related to transmission and reception processing of a Tx 25a and a Rx 26a in accordance with execution of the programs stored in the memory unit 23 in a storage area at a specific address of an EEPROM 24.

A method for managing optical transceivers includes obtaining laser measurements for a laser operating in an optical transceiver in a network device, obtaining a failure profile for the laser, making a first determination that the laser measurements match the failure profile, and based on the first determination, initiating a remediation action for the optical transceiver.

Systems, methods, and devices are disclosed for implementing photonic links. Methods include transmitting light using an optical emitter, splitting, using an input coupler, the light into a first path and a second path, the first path being provided to a modulator, and the second path being provided to a phase shifter, and combining, using an output coupler, an output of the modulator and an output of the phase shifter. Methods further include identifying a modulator phase angle that reduces a third order distortion at an output of the output coupler, applying a first bias voltage to a modulator to maintain the identified modulator phase angle, and applying a control signal to the phase shifter to maintain a phase difference between an output of the modulator and an output of a phase shifter.

An optical communication system includes an optical module and a host. The optical module has a fiber connector and a laser condition pin, wherein the fiber connector is configured to connect to a laser output of an external laser source. The optical module is configured to set an output of the laser condition pin to have a first value when detecting a laser beam through the fiber connector. The host is connected to the laser condition pin and has a control connector, wherein the control connector is configured to connect to the external laser source. The host is configured to output a release signal through the control connector when detecting the first value on the laser condition pin, wherein the release signal changes the laser output from outputting a laser beam having a first power to outputting a laser beam having a second power higher than the first power.

The embodiments of the present disclosure provide an avalanche photo diode (APD) performance detection method and apparatus for an optical module, and an optical network and a medium. The method is applicable to an optical network including an optical module and an optical network unit (ONU); the method includes: selecting at least one optical network unit identifier (ONU ID) as a detection ONU ID; allocating a bandwidth to the detection ONU ID and enabling the bandwidth; acquiring received optical power of the optical module for the detection ONU ID; and determining, on the basis of the received optical power, whether the performance of an APD in the optical module deteriorates.

Various indirect feedback tuning apparatuses and methods for tuning photonic systems are enabled. For instance, a system can perform operations, such as: determining a temperature of an optical device, determining, based on the temperature of the optical device and a feedback model, a tuning input to stabilize an optical signal, and performing, based on the tuning input, feedback tuning, wherein the feedback tuning comprises thermal tuning and electrical tuning.

An optical communication system includes an optical module and a host. The optical module has a fiber connector and a laser condition pin, wherein the fiber connector is configured to connect to a laser output of an external laser source. The optical module is configured to set an output of the laser condition pin to have a first value when detecting a laser beam through the fiber connector. The host is connected to the laser condition pin and has a control connector, wherein the control connector is configured to connect to the external laser source. The host is configured to output a release signal through the control connector when detecting the first value on the laser condition pin, wherein the release signal changes the laser output from outputting a laser beam having a first power to outputting a laser beam having a second power higher than the first power.

The disclosure provides for a method for reacquiring a communication link between a first communication device and a second communication device. The method includes using one or more processors of the first communication device to receive historical data related to the first communication device and an environment surrounding the first communication device. The one or more processors are then used to determine one or more trends in the historical data related to fading of the communication link. Based on the one or more trends, the one or more processors are used to determine a starting time and an initial search direction for a search for the communication link. The one or more processors then execute the search at the starting time from the initial search direction.