A bidirectional optical repeater having two unidirectional optical amplifiers and a supervisory optical circuit connected to optically couple the optical ports thereof. In an example embodiment, the supervisory optical circuit provides one or more pathways therethrough for supervisory optical signals, each of these pathways having located therein a respective narrow band-pass optical filter. The supervisory optical circuit further provides one or more pathways therethrough configured to bypass the corresponding narrow band-pass optical filters in a manner that enables backscattered light of any wavelength to cross into the optical path that has therein the unidirectional optical amplifier directionally aligned with the propagation direction of the backscattered light.

Techniques for automatically determining an input resistance of an optical modulator and configuring a modulation current source can include applying a first bias current to an input of the optical transmitter and measuring a corresponding first voltage at the input of the optical transmitter. A second bias current can also be applied to the input of the optical transmitter and a corresponding second voltage at the input of the optical transmitter can be measured. An input resistance of the specific optical transmitter can be determined from the difference between the first and second voltages divided by the difference between the first and second bias currents. The technique can further include setting one or more configuration settings in one or more registers of a modulation current source based on the determined input resistance of the optical transmitter. Thereafter, the output modulation current for driving the specific optical transmitter can be configured based on the one or more configuration settings in the one or more registers.

A method, an apparatus and a device for detecting an optical module, and a storage medium are provided. The method includes: constructing insertion loss ranges meeting an insertion loss specification that respectively correspond to different signal frequencies in a predetermined signal frequency range, to construct a target insertion loss region; acquiring a microstripline length, a stripline length, a via number and a connector number of a to-be-detected optical module; inputting the microstripline length, the stripline length, the via number and the connector number to a pre-constructed first model, to determine an insertion loss curve of the to-be-detected optical module in the signal frequency range; and determining that the to-be-detected optical module is unqualified if a part of the insertion loss curve is outside the target insertion loss region.

Systems and methods for mapping optical connections in an FDH are disclosed. An example system includes an FDH and a computing device. The FDH includes a bulkhead having: a plurality of passive optical couplers each having a respective first port to receive a respective first optical fiber, a respective second port to receive a respective second optical fiber, and a respective passive optical activity indicator configured to expose first light propagating in the respective first optical fiber, and second light propagating in the respective second optical fiber; and an image sensor configured to capture one or more images of the plurality of passive optical activity indicators. The computing device configured to, based on the one or more images, determine which of the plurality of passive optical couplers are receiving a first optical signal at their respective first port and/or receiving a second optical signal at their respective second port.

Systems and methods for mapping optical connections in an FDH are disclosed. An example system includes an FDH and a computing device. The FDH includes a bulkhead having: a plurality of passive optical couplers each having a respective first port to receive a respective first optical fiber, a respective second port to receive a respective second optical fiber, and a respective passive optical activity indicator configured to expose first light propagating in the respective first optical fiber, and second light propagating in the respective second optical fiber; and an image sensor configured to capture one or more images of the plurality of passive optical activity indicators. The computing device configured to, based on the one or more images, determine which of the plurality of passive optical couplers are receiving a first optical signal at their respective first port and/or receiving a second optical signal at their respective second port.

In one example aspect, a method of determining a channel estimate of an optical communications channel between at least one optical transmitting component and at least one optical receiving component is provided, the method comprising determining a location of at least one optical transmitting component, determining an orientation of the at least one optical transmitting component, determining a transmission characteristic of the at least one optical transmitting component, determining a location of at least one optical receiving component, determining an orientation of the at least one optical receiving component, determining a reception characteristic of the at least one optical receiving component, and calculating the channel estimate of the optical communications channel based on the location of the at least one optical transmitting component, the orientation of the at least one optical transmitting component, the transmission characteristic of the at least one optical transmitting component, the location of the at least one optical receiving component, the orientation of the at least one optical receiving component and the reception characteristic of at least one optical receiving component.

In one example aspect, a method of determining a channel estimate of an optical communications channel between at least one optical transmitting component and at least one optical receiving component is provided, the method comprising determining a location of at least one optical transmitting component, determining an orientation of the at least one optical transmitting component, determining a transmission characteristic of the at least one optical transmitting component, determining a location of at least one optical receiving component, determining an orientation of the at least one optical receiving component, determining a reception characteristic of the at least one optical receiving component, and calculating the channel estimate of the optical communications channel based on the location of the at least one optical transmitting component, the orientation of the at least one optical transmitting component, the transmission characteristic of the at least one optical transmitting component, the location of the at least one optical receiving component, the orientation of the at least one optical receiving component and the reception characteristic of at least one optical receiving component.

Systems and methods include detecting a fast fiber transient on a span based on analyzing power data, wherein the power data is for any of optical wavelengths of traffic channels, optical service channel (OSC) wavelengths, and telemetry from a network element; and responsive to detecting the fast fiber transient, causing an optical time domain reflectometer (OTDR) trace on the span with a specific configuration based on the fast fiber transient.

This method includes a reference optical fiber transmission loss measurement step for measuring a reference optical fiber transmission loss measurement value, a difference value calculation step for subtracting the transmission loss reference value from the reference optical fiber transmission loss measurement value and calculating a transmission loss difference value, and a measured-optical-fiber measurement step for measuring the transmission loss of an optical fiber to be measured, the reference optical fiber transmission loss measurement step being repeatedly performed, a transmission loss difference value being calculated by performing the difference value calculation step each time a reference optical fiber transmission loss measurement value is obtained, a correction value being calculated on the basis of a plurality of transmission loss difference values, the measurement value obtained in the measured-optical-fiber measurement step being corrected using the correction value, and the transmission loss value of the optical fiber to be measured being determined.

This method includes a reference optical fiber transmission loss measurement step for measuring a reference optical fiber transmission loss measurement value, a difference value calculation step for subtracting the transmission loss reference value from the reference optical fiber transmission loss measurement value and calculating a transmission loss difference value, and a measured-optical-fiber measurement step for measuring the transmission loss of an optical fiber to be measured, the reference optical fiber transmission loss measurement step being repeatedly performed, a transmission loss difference value being calculated by performing the difference value calculation step each time a reference optical fiber transmission loss measurement value is obtained, a correction value being calculated on the basis of a plurality of transmission loss difference values, the measurement value obtained in the measured-optical-fiber measurement step being corrected using the correction value, and the transmission loss value of the optical fiber to be measured being determined.