A device may include a processor configured to select a quantum key distribution transmission; identify an optical fiber path via which the quantum key distribution transmission is to be performed; determine one or more values for at least one transmission parameter for the identified optical fiber path; and select a pulse script for the optical fiber path based on the determined one or more values for the at least one transmission parameter. The processor may be further configured to perform the quantum key distribution transmission via the identified optical fiber path using the selected pulse script.

A WDM1r combiner for a PON. The output end of an input waveguide is connected to the input end of a first grating filter, the output end of the first grating filter is connected to the input ends of a first mode filter, a second grating filter, a second mode filter, a connecting waveguide, a third grating filter, a third mode filter, and a fourth grating filter in sequence, and the output end of the fourth grating filter is connected to an output waveguide. The function of the WDM1r combiner for a PON is achieved in the form of cascaded grating filters; different central wavelengths and bandwidths of four channels are obtained by optimizing a grating structure; an on-chip WDM1r combiner which is low in insertion loss and crosstalk and has flat-top response is obtained; the combiner has the advantages of being simple in structure, simple in process, excellent in performance, etc.

A demultiplexer for use in a wavelength division multiplexed system. The demultiplexer comprises: an input waveguide, configured to receive a wavelength division multiplexed signal; a demultiplexing element, configured to demultiplex the multiplexed signal received from the input waveguide into a plurality of multi-mode demultiplexed signal components; a multi-mode output waveguide, the multi-mode output waveguide being coupled to the demultiplexing element and configured to receive one of the multi-mode demultiplexed signal components; and a splitter, coupled to the multi-mode output waveguide, and configured to split the received multi-mode demultiplexed signal component into two single-mode outputs.

A device may include a processor configured to select a quantum key distribution transmission; identify an optical fiber path via which the quantum key distribution transmission is to be performed; determine one or more values for at least one transmission parameter for the identified optical fiber path; and select a pulse script for the optical fiber path based on the determined one or more values for the at least one transmission parameter. The processor may be further configured to perform the quantum key distribution transmission via the identified optical fiber path using the selected pulse script.

Disclosed herein are methods and systems configuring a raman amplifier. One exemplary system may be provided with an optical amplifier deployed in an optical network, the optical amplifier having a plurality of raman pumps configured to obtain a desired gain profile. An actual gain profile and a raman pump configuration of each of the plurality of raman pumps may be processed by a network administration device using a first machine learning model to produce a combined optical transmission segment attribute representing attributes of an optical segment of the optical network. The combined optical transmission segment attribute and the desired gain profile may be processed with a second machine learning model to produce corrected raman pump configurations for each of the plurality of raman pumps of the raman amplifier. The corrected raman pump configurations may be used to configure each of the plurality of raman pumps of the raman amplifier.

Exemplary multi-channel optical couplers include a molded coupling module comprising a first surface, a second surface, a lens array receptacle, and fiber receptacles for optical fibers; an optical arrangement comprising: a particular surface carrying a reflective coating, and a further surface carrying a plurality of optical filters, each configured to pass a single optical wavelength; a first lens array configured such that each lens is optically aligned with the plurality of optical filters via at least the reflective coating, and with a position, within a particular fiber receptacle, corresponding to the end of a particular optical fiber; a second lens array arranged with the second surface such that each lens is optically aligned with an optical filter. The optical block and lens arrays can be configured such that the optical coupler produces no more than −10 dB of crosstalk on any of the optical wavelengths passed by the optical filters.

A redundant wavelength division multiplexing (WDM) device including a first common port which includes a collimator configured to transmit a first optical beam. The first beam includes a first plurality of optical signals. A second common port includes a collimator configured to transmit a second optical beam that includes a second plurality of optical signals. The second common port is spaced apart from the first common port and a plurality of filters define an optical path for each of the first optical beam and the second optical beam. Each filter is oriented to interact with each of the first optical beam and the second optical beam. A method of processing light includes transmitting one of the first optical signals of a first wavelength through a first filter and transmitting one of the second optical signals of the first wavelength through the first filter.

A device may include a processor configured to select a quantum key distribution transmission; identify an optical fiber path via which the quantum key distribution transmission is to be performed; determine one or more values for at least one transmission parameter for the identified optical fiber path; and select a pulse script for the optical fiber path based on the determined one or more values for the at least one transmission parameter. The processor may be further configured to perform the quantum key distribution transmission via the identified optical fiber path using the selected pulse script.

A redundancy system for a distributed antenna system is provided. The system includes a first communication link, a second communication link, a first communication node and a second communication node. The first communication link traverses first path. The second communication link traverses a second path. The second path is spatially separated from the first path. The first communication node is communicatively coupled to transmit the same signal through both the first communication link and the second communication link. The second communication node has a receiver system that is communicatively coupled to receive the signals transmitted through the first and second communication links. The receiver system is configured to synchronize delay and phase differences between the received signals and then combine the signals together to generate a single output.

A receiving device includes a light source outputting local oscillation light, a detector detecting intermittent input of a burst light signal by using the local oscillation light, a first converter converting the detected burst optical signal into an electrical analog signal, an amplifier amplifying the analog signal according to a gain, a second converter converting the amplified analog signal into a digital signal, and a setting processor setting the gain of the amplifier and a wavelength of the local oscillation light instructed by a control device when setting a communication line with one of transmitting devices transmitting the burst optical signal, wherein, before setting the communication line, the setting processor switches the wavelength of the local oscillation light according to the burst optical signal transmitted from each of the transmitting devices, adjusts the gain of the amplifier and notifies the control device of the adjusted gain.