A method, equipment, and operation management system for detecting and authenticating a terminal in a passive optical network are provided. The method includes the following steps. The terminal has a logic registration code. A central office end receives the logic registration code sent by the terminal. The central office end judges whether the logic registration code of the terminal matches with the logic registration code stored at the central office end, and determines that the terminal is a valid terminal if the logic registration code sent by the terminal matches with the logic registration code stored at the central office end. The central office end records a terminal serial number from the valid terminal, and records a terminal identifier assigned to the valid terminal. By using the provided method, equipment, and operation management system, it is unnecessary to statically configure the terminal SN at the central office end, such that the maintenance cost of the central office end and the terminal is lowered, the flexibility of terminal detection and authentication is improved, and the maintainability of the central office end and the terminal is also enhanced.

Methods and apparatus are provided for wavelength control of multiple independent laser sources to reduce relative wavelength drift between the different laser sources. According to some aspects, multiple laser wavelength control is provided using a multi-line source as a wavelength reference. According to other aspects, multiple laser wavelength control is provided using a single wavelength sensing device. The multiple independent laser sources could generate the constituent optical channels of a super-channel. Benefits could include reduced guard band width and increased spectral efficiency within the super-channel.

The present disclosure provides a wavelength division multiplexing (WDM) device for demultiplexing an optical signal including a plurality of wavelength channels. The device comprises at least one demultiplexer block configured to provide, for each wavelength channel of the optical signal, two half-channel signals. The device further comprises a mode mapping block configured to map one half-channel signal related to a split wavelength channel into a first polarization mode, and the other half-channel signal related to the same split wavelength channel into a second polarization mode. The device also comprises an output block for each wavelength channel, each output block being configured to combine polarized half-channel signals related to the same wavelength channel.

An optical transmission apparatus (1_1) according to the present invention includes a first transmission unit (11_1) that transmits a first optical transmission signal (21_1), a second transmission unit (11_2) that transmits a second optical transmission signal (21_2), and an output unit that outputs, when the first optical transmission signal (21_1) and the second optical transmission signal (21_2) share a set of information, both the first optical transmission signal (21_1) and the second optical transmission signal (21_2) to a first path (26_1) and outputs, when the first optical transmission signal (21_1) and the second optical transmission signal (21_2) do not share the set of information, one of the first optical transmission signal (21_1) and the second optical transmission signal (21_2) to a second path (26_2).

An optical transmission apparatus (1_1) according to the present invention includes a first transmission unit (11_1) that transmits a first optical transmission signal (21_1), a second transmission unit (11_2) that transmits a second optical transmission signal (21_2), and an output unit that outputs, when the first optical transmission signal (21_1) and the second optical transmission signal (21_2) share a set of information, both the first optical transmission signal (21_1) and the second optical transmission signal (21_2) to a first path (26_1) and outputs, when the first optical transmission signal (21_1) and the second optical transmission signal (21_2) do not share the set of information, one of the first optical transmission signal (21_1) and the second optical transmission signal (21_2) to a second path (26_2).

An electromagnetic signal transport and distribution system simultaneously transports over one single mode fiber various programming specifically requested by multiple users in multiple locations while simultaneously offering bidirectional communications with a public network.

Embodiments of the present invention provide a receiver and a data receiving method. The receiver includes: two first input ends, configured to receive a digital signal of an X-polarization state and a digital signal of a Y-polarization state; a despreading module, configured to despread the digital signal of the X-polarization state and the digital signal of the Y-polarization state based on N delay values and spreading codes of N transmitters, to obtain N first baseband signals and N second baseband signals; and a multiple-input multiple-output equalization module, configured to perform equalization filtering processing on the N first baseband signals and the N second baseband signals, to obtain recovered data of the first polarization states and recovered data of the second polarization states of the N transmitters. In the embodiments of the present invention, the coherent CDMA multipoint-to-point data transmission in an optical communications system is implemented.

Methods and apparatus are provided for wavelength control of multiple independent laser sources to reduce relative wavelength drift between the different laser sources. According to some aspects, multiple laser wavelength control is provided using a multi-line source as a wavelength reference. According to other aspects, multiple laser wavelength control is provided using a single wavelength sensing device. The multiple independent laser sources could generate the constituent optical channels of a super-channel. Benefits could include reduced guard band width and increased spectral efficiency within the super-channel.

The present disclosure provides a WDM, device 100 for demultiplexing an optical signal 101 including a plurality of N wavelength channels. The device 100 comprises at least one demultiplexer block 102 configured to split the optical signal into two half-channel signals 103 for each wavelength channel. The device 100 further comprises a mode mapping block 104 configured to map one half-channel signal 103 related to a split wavelength channel into a first polarization mode, and the other half-channel signal 103 related to the same split wavelength channel into a second polarization mode. The device 100 also comprises an output block 105 for each wavelength channel, which is configured to combine all polarized half-channel signals related to the same wavelength channel.

Techniques for efficiently utilize the available bandwidth in a communication network are described. One example implementation includes a method of optical communication including receiving bandwidth requests from multiple network devices in an optical network, receiving communication capability information about the multiple network devices, generating a transmission schedule that specifies transmissions in the optical network in multiple time slots with a corresponding modulation format, and transmitting and/or receiving data based on the transmission schedule.