Abstract: The technology of this application relates to an erbium-doped fiber. The erbium-doped fiber can be used in the fields of amplifiers, optical communications, rare-earth-doped fiber preparation, and the like. A fiber core of the erbium-doped fiber includes a first layer and a second layer from inside to outside. The first layer includes a center of the fiber core. The second layer is an annulus, and an outer ring of the annulus is an outer ring of the fiber core. An average doping concentration of erbium ions of the first layer is higher than an average doping concentration of erbium ions of the second layer. An ASE can be reduced by reducing a doping concentration of erbium ions of the second layer, to further reduce a noise figure of the erbium-doped fiber and improve communications quality.

Abstract: An erbium-doped optical fiber includes a fiber core, where the fiber core includes erbium ions, aluminum ions, phosphorus ions, lanthanum ions, antimony ions, and silicon ions. A mass percentage of the erbium ions ranges from 0.25 percentage by weight (wt %) to 0.6 wt %, a mass percentage of the aluminum ions ranges from 3 wt % to 6 wt %, a mass percentage of the phosphorus ions ranges from 7 wt % to 16 wt %, a mass percentage of lanthanum ions ranges from 0.5 wt % to 1.2 wt %, a mass percentage of antimony ions ranges from 1 wt % to 5 wt %, and a mass percentage of silicon ions is greater than 60 wt %.

Abstract: The technology of this application relates to the field of communication technologies, and an optical fiber raw material composition, an optical fiber, and an optical fiber product. The optical fiber raw material composition includes components of the following molar percentages: AlF3 10%-50%, BaF2 3%-20%, CaF2 3%-20%, YF3 1%-15%, SrF2 3%-20%, MgF2 3%-20%, and TeO2 1%-35%. The optical fiber prepared by using the optical fiber raw material composition provided in this disclosure can be used in aspects such as a mid-infrared band transmission optical fiber, an optical fiber amplifier, a fiber laser, and an optical fiber sensor.

Abstract: The technology of this application relates to an optical component constituting a fiber amplifier, a fiber amplifier, and a manufacturing method. The optical component is connected to a gain fiber by using a first fiber, or the optical component is directly connected to the gain fiber. The optical component is connected to one or more second optical components in the fiber amplifier by using a second fiber, and/or the optical component inputs an optical signal or outputs an optical signal amplified by the gain fiber by using the second fiber. Softening temperatures and/or refractive indexes of the first fiber and the second fiber are different, or softening temperatures and/or refractive indexes of the second fiber and the gain fiber are different.

Abstract: Example gratings, grating characteristic adjustment methods and devices are provided. One example grating includes a first optical waveguide region, a second optical waveguide region, and an arrayed waveguide region comprising a plurality of optical waveguides, where the first optical waveguide region is connected to the arrayed waveguide region, and the second optical waveguide region is connected to the arrayed waveguide region. The grating has at least one of the following characteristics: a refractive index of an optical waveguide in the first optical waveguide region can be changed, a refractive index of an optical waveguide in the second optical waveguide region can be changed, a refractive index of an optical waveguide in the arrayed waveguide region can be changed, or an optical waveguide in an arrayed waveguide region can be eliminated.

Abstract: A filter includes a first filter component coupled to a second filter component. The first filter component is configured to receive an optical signal, and filter the optical signal based on a first power difference of signals transmitted on a plurality of frequency bands in the optical signal, where the first power difference includes a difference caused by a first doped optical fiber. The second filter component is loaded with a first driving electrical signal used to control a frequency response of the second filter component. The second filter component is configured to filter, using the frequency response based on a second power difference of the signals transmitted on the plurality of frequency bands, an optical signal obtained after the filtering by the first filter component.

Abstract: An optical waveguide apparatus, a control method for the optical waveguide apparatus, and a storage medium are described in the disclosure. In one example implementation, an optical waveguide apparatus includes a control component and a waveguide structure. The waveguide structure includes m input interfaces and n output interfaces, where both m and n are integers greater than 1. The waveguide structure includes a first waveguide layer and a second waveguide layer, where an optical waveguide exists in the second waveguide layer. The control component is configured to control the first waveguide layer to form an optical waveguide, and the optical waveguide and an optical waveguide in the second waveguide layer form a cross-layer optical signal path.

Abstract: An optical waveguide apparatus including a first dispersion unit and a separation unit. The first dispersion unit is connected to the separation unit, the first dispersion unit is configured to disperse a frequency component of at least one first optical signal, and the separation unit is configured to separate, into at least one second optical signal based on configuration information, the frequency component that is of the at least one first optical signal and that is dispersed by the first dispersion unit. The separation unit is implemented by a variable optical waveguide, and the variable optical waveguide is an optical waveguide that implements at least one of the following functions based on the configuration information: forming an optical waveguide, eliminating an optical waveguide, and changing a shape of an optical waveguide.

Abstract: An optical signal processing method and apparatus. The method includes: obtaining a first sending signal, where the first sending signal is a signal that is sent by a first transmitter to a second receiver through a first optical fiber; determining estimation information of a backward optical signal based on the first sending signal; the backward optical signal is generated during transmission of the first sending signal, the backward optical signal is transmitted through at least one fiber section in the first optical fiber, and a transmission direction of the backward optical signal is opposite to a transmission direction of the first sending signal; and obtaining a second sending signal based on the estimation information of the backward optical signal. According to the embodiments, impact of the backward optical signal on effective signal transmission can be reduced, and a signal-to-noise ratio can be improved.

Abstract: An optical waveguide apparatus including a first dispersion unit and a separation unit. The first dispersion unit is connected to the separation unit, the first dispersion unit is configured to disperse a frequency component of at least one first optical signal, and the separation unit is configured to separate, into at least one second optical signal based on configuration information, the frequency component that is of the at least one first optical signal and that is dispersed by the first dispersion unit. The separation unit is implemented by a variable optical waveguide, and the variable optical waveguide is an optical waveguide that implements at least one of the following functions based on the configuration information: forming an optical waveguide, eliminating an optical waveguide, and changing a shape of an optical waveguide.

Abstract: An optical waveguide apparatus, a control method for the optical waveguide apparatus, and a storage medium are described in the disclosure. In one example implementation, an optical waveguide apparatus includes a control component and a waveguide structure. The waveguide structure includes m input interfaces and n output interfaces, where both m and n are integers greater than 1. The waveguide structure includes a first waveguide layer and a second waveguide layer, where an optical waveguide exists in the second waveguide layer. The control component is configured to control the first waveguide layer to form an optical waveguide, and the optical waveguide and an optical waveguide in the second waveguide layer form a cross-layer optical signal path.

Abstract: An Ethernet signal transport method includes: inserting, by a first network device, path monitoring information into a position that is a preset bit length away from an alignment marker (AM) in a physical coding sublayer lane (PCSL) of an Ethernet signal; and sending, by the first network device to at least one second network device, a signal bearing the PCSL into which the path monitoring information is inserted.

Abstract: A node in a wavelength division multiplexing (WDM) system is provided, which includes: a colorless optical transmitter, a first arrayed waveguide grating, a first waveband filter configured to divide an input optical signal into M sub-signals of different wavebands and output to a first optical switch, and a first optical coupler/a first optical combiner. A transmit end of the colorless optical transmitter is coupled to an input end of the first waveband filter via the first arrayed waveguide grating. The first optical switch is configured to connect an output end of the first waveband filter to an input end of the first optical coupler/the first optical combiner according to a control signal. An output end of the first optical coupler/the first optical combiner is coupled to an optical transmission path.

Abstract: An Ethernet signal transport method includes: inserting, by a first network device, path monitoring information into a position that is a preset bit length away from an alignment marker (AM) in a physical coding sublayer lane (PCSL) of an Ethernet signal; and sending, by the first network device to at least one second network device, a signal bearing the PCSL into which the path monitoring information is inserted.

Abstract: Embodiments of the present invention relate to the communications field and disclose a data transmission method, apparatus, device, and system, so as to acquire attribution information of a PCSL, and decrease overheads and complexity of identifying a network link during data transmission. The method includes: inserting a feature code block into a physical coding sublayer PCS to form a physical coding sublayer lane PCSL, where the feature code block is used to represent an Ethernet link to which the PCSL belongs; and sending the PCSL. The present invention is used for PCSL attribution identification.

Abstract: The prevent invention relates to a method, an apparatus, and a system for processing a flexible-rate signal. The method includes encapsulating a signal from a client side to n optical channel data unit ODU signals, and encapsulating the n ODU signals to a flexible optical channel transport unit OTU signal, where a nominal bit rate of the flexible OTU signal varies according to a value of n and the n is an integer greater than or equal to 1.

Abstract: A node in a wavelength division multiplexing (WDM) system is provided, which includes: a colorless optical transmitter, a first arrayed waveguide grating, a first waveband filter configured to divide an input optical signal into M sub-signals of different wavebands and output to a first optical switch, and a first optical coupler/a first optical combiner. A transmit end of the colorless optical transmitter is coupled to an input end of the first waveband filter via the first arrayed waveguide grating. The first optical switch is configured to connect an output end of the first waveband filter to an input end of the first optical coupler/the first optical combiner according to a control signal. An output end of the first optical coupler/the first optical combiner is coupled to an optical transmission path.

Abstract: Embodiments of the present disclosure disclose a service transmission method and a device and a system for implementing the method. The method includes: recognizing a type of a received client service, encapsulating an OTN service, and generating an OTN signal frame or a lower order ODU; querying a tag forwarding base to acquire forwarding information of the OTN signal frame or the lower order ODU; acquiring tag information, and inserting the tag information into an overhead of the OTN signal frame or the lower order ODU; and forwarding the OTN signal frame according to the forwarding information. Therefore, in the embodiments of the present disclosure, the forwarding and the transmission of the service may be performed in an OTN plane only, thereby reducing hardware modules of an MPLS plane.

Abstract: The present invention provides a receiving device and an optical switching fabric apparatus, where the receiving device includes: multiple selecting modules, a fast optical switch connecting to each selecting module, an output module connecting to all the fast optical switches, and a receiver connecting to the output module, where the selecting module is configured to receive a multiwavelength optical signal, select and filter a first optical signal of a preset time segment in the multiwavelength optical signal; the fast optical switch is configured to select a second optical signal from the first optical signal filtered by the selecting module; the output module is configured to combine optical signals separately selected by all the fast optical switches into one optical burst signal; and the receiver is configured to perform optical-to-electrical conversion on the optical burst signal, and extract service data from an electrical signal.

Abstract: An optical signal transmission method includes: obtaining a signal identifier of data to be sent; obtaining corresponding optical frequency slot distribution information according to the signal identifier; and determining a corresponding carrier according to the obtained optical frequency slot distribution information, using the determined carrier to carry the data to be sent to generate an optical signal, and sending the generated optical signal. The optical signal transmission method provided in the present invention does not fix the optical frequency slot distribution into a wavelength identifier, the number of optical frequency slots is not limited by the wavelength identifier field length, and the data to be sent can be transmitted in an optical network by being carried on the carrier determined according to multiple optical frequency slots.