This application provides a spectrum resource configuration method, a network device, and a system. The method includes: A network device determines spectrum resources to be used by a to-be-opened channel, where the spectrum resources to be used by the to-be-opened channel include first spectrum resources and a second spectrum resource, the first spectrum resources are original spectrum resources of the to-be-opened channel, the second spectrum resource is some of original spectrum resources of an adjacent channel of the to-be-opened channel, and the original spectrum resources of the adjacent channel are adjacent to the original spectrum resources of the to-be-opened channel; and opens the to-be-opened channel based on the spectrum resources to be used by the to-be-opened channel.

Implementations described and claimed herein provide systems and methods for a configurable optical peering fabric to dynamically create a connection between participant sites without any physical site limitations or necessity of specialized client and network provider equipment being located within such a facility. Client sites to a network may connect to a configurable switching element to be interconnected to other client sites in response to a request to connect the first client site with a second site, also connected to network, via the switching element. A request may trigger verification of the requested and, upon validation, transmission of an instruction to the switching element to enable the cross connect within the switching element. The first site and the second site may thus be interconnected via the switching element in response to the request, without the need to co-locate equipment or to manually install a jumper between client equipment.

Optical network systems and components are disclosed, including a transmitter comprising a digital signal processor that receives data; circuitry that generate a plurality of electrical signals based on the data; a plurality of filters, each of which receiving a corresponding one of the plurality of electrical signals, a plurality of roll-off factors being associated with a respective one of the plurality of filters; a plurality of DACs that receive outputs from the digital signal processor, the outputs being indicative of outputs from the plurality of filters; a laser that supplies light; and a modulator that receives the light and outputs from the DACs, and supplies a plurality of optical subcarriers based on the outputs, such that one of the optical subcarriers has a frequency bandwidth that is wider than remaining ones of the optical subcarriers, said one of the optical subcarriers carrying information for clock recovery.

Optical amplifier apparatus (100) comprising: an input (102) for an incoming optical signal (IN) comprising an optical supervisory channel, OSC, signal and service channel signals at channel wavelengths of a WDM channel wavelength grid; an output (112) for an outgoing optical signal (OUT); an optical amplifier, OA, (106) having an operating bandwidth including the WDM channel wavelength grid; a first optical drop filter (104) configured to drop from an IN signal an out-of-band, OOB, OSC signal at a wavelength outside the OA operating bandwidth; a second optical drop filter (108, 208) configured to drop from an IN signal an in-band, IB, OSC signal at a wavelength within the OA operating bandwidth; an OSC signal output (114) configured to output the dropped OSC signal; an OSC signal input (116) configured to receive an outgoing OOB OSC or IB OSC signal; and an optical add filter (110, 210) configured to add an outgoing OOB OSC or IB OSC signal to service channel signals at channel wavelengths of the WDM channel wavelength grid to form the OUT signal.

In an optical communication network including a plurality of communication apparatuses being connected by a transmission path transmitting WDM signal light in which a plurality of optical signals are performed wavelength division multiplexing, a network management apparatus includes an addition control unit that controls a first communication apparatus, when the first communication apparatus adds the optical signal to the WDM signal light, in such a way as to add, to be adjacent to each other, a plurality of the optical signals to be dropped by a second communication apparatus to a wavelength band being sandwiched between guard bands, and a drop control unit that controls the second communication apparatus, when the second communication apparatus drops the optical signal from the WDM signal light.

Optical network systems and components are disclosed including a transmitter comprising a digital signal processor receiving a plurality of independent data streams, the digital signal processor supplying outputs based on the plurality of independent data streams, the digital signal processor comprising a plurality of pulse shape filters corresponding to the plurality of independent data streams, the plurality of pulse shape filters configured to filter the independent data streams to produce a first subcarrier having a first frequency bandwidth and a second subcarrier having a second frequency bandwidth different than the first frequency bandwidth for the outputs.

Optical network systems and components are disclosed, including a transmitter comprising a digital signal processor receiving a plurality of independent data streams, and supplying a plurality of digital subcarrier outputs, based on the plurality of independent data streams, and configurable to vary the frequency spacing between two or more of the plurality of digital subcarrier outputs; the transmitter configured to output a modulated optical signal including a plurality of optical subcarriers based on the digital subcarrier outputs wherein based on first ones of the plurality of digital outputs, the first one of the plurality of subcarriers is spectrally spaced from the second one of the plurality subcarriers by a first gap, and based on second ones of the plurality of digital outputs, the first one of the plurality of subcarriers is spectrally spaced from the second one of the plurality of subcarriers by a second gap different than the first.

Optical network systems and components are disclosed, including a transmitter comprising a digital signal processor that receives data; circuitry that generate a plurality of electrical signals based on the data; a plurality of filters, each of which receiving a corresponding one of the plurality of electrical signals, a plurality of roll-off factors being associated with a respective one of the plurality of filters; a plurality of DACs that receive outputs from the digital signal processor, the outputs being indicative of outputs from the plurality of filters; a laser that supplies light; and a modulator that receives the light and outputs from the DACs, and supplies a plurality of optical subcarriers based on the outputs, such that one of the optical subcarriers has a frequency bandwidth that is wider than remaining ones of the optical subcarriers, said one of the optical subcarriers carrying information for clock recovery.

Optical fiber data communications are described. A controller can determine chromatic dispersion of an optical signal that is to be demodulated using coherent detection. The controller can then determine the chromatic dispersion of another optical signal that is to be demodulated using direct detection. The chromatic dispersion of the other optical signal can then be adjusted to account for chromatic dispersion experienced by the other optical signal when it propagated through an optical fiber.

A frequency-selective system that may be used as, or as part of, an add/drop multiplexer. An input signal is fed to a Mach-Zehnder interferometer configured to drop, or suppress, by destructive interference, a signal component in a first frequency band from among a plurality of frequency bands. One or more bandpass filters in one arm of the Mach-Zehnder interferometer suppress other frequencies, outside of the first frequency band, so that signals at these other frequencies are not suppressed by destructive interference and are present at the output of the Mach-Zehnder interferometer. A coupler connected after the output of the Mach-Zehnder interferometer adds, into the signal path, a replacement for the dropped signal.