A visible-light communication and illumination array includes a substrate and plural surface-emitting superluminescent diodes, SLDs, distributed across the substrate. A first set of SLDs of the plural SLDs generates a first light beam having substantially a first wavelength, a second set of SLDs of the plural SLDs generates a second light beam having substantially a second wavelength, and a third set of SLDs of the plural SLDs generates a third light beam having substantially a third wavelength. The array further includes a controller configured to encode at least one of the first light beam, the second light beam and the third light beam to transmit information. A combination of the first light beam, the second light beam and the third light beam produces white light.

A visible-light communication and illumination array includes a substrate and plural surface-emitting superluminescent diodes, SLDs, distributed across the substrate. A first set of SLDs of the plural SLDs generates a first light beam having substantially a first wavelength, a second set of SLDs of the plural SLDs generates a second light beam having substantially a second wavelength, and a third set of SLDs of the plural SLDs generates a third light beam having substantially a third wavelength. The array further includes a controller configured to encode at least one of the first light beam, the second light beam and the third light beam to transmit information. A combination of the first light beam, the second light beam and the third light beam produces white light.

A wavelength division multiplexer/demultiplexer, a photonic integrated chip, and an optical module are provided. The wavelength division multiplexer/demultiplexer includes a substrate, a bus waveguide provided on the substrate, and at least two wavelength division multiplexing/demultiplexing units provided on the bus waveguide. Each of the at least two wavelength division multiplexing/demultiplexing units includes a mode multiplexer and an asymmetric Bragg grating. The mode multiplexer includes a first port, a second port, and a third port. The third port is connected to the asymmetric Bragg grating, so as to input a light in a TE1 mode or a higher-order mode to the asymmetric Bragg grating. The asymmetric Bragg grating transmits light containing wavelengths other than a wavelength λi. A grating period of the asymmetric Bragg grating and the wavelength λi satisfy a resonance condition.

A wavelength division multiplexer/demultiplexer, a photonic integrated chip, and an optical module are provided. The wavelength division multiplexer/demultiplexer includes a substrate, a bus waveguide provided on the substrate, and at least two wavelength division multiplexing/demultiplexing units provided on the bus waveguide. Each of the at least two wavelength division multiplexing/demultiplexing units includes a mode multiplexer and an asymmetric Bragg grating. The mode multiplexer includes a first port, a second port, and a third port. The third port is connected to the asymmetric Bragg grating, so as to input a light in a TE1 mode or a higher-order mode to the asymmetric Bragg grating. The asymmetric Bragg grating transmits light containing wavelengths other than a wavelength λi. A grating period of the asymmetric Bragg grating and the wavelength λi satisfy a resonance condition.

A system for dispersion compensation for a fibered communication path, the system being configured for connection with a node of the fibered communication path. The system includes a controller; a wavelength selective switch (WSS) communicatively coupled to the controller, the WSS being configured for operatively coupling to at least one fiber of the fibered communication path; and dispersion compensation modules (DCM) optically connected to the WSS. Each DCM is configured to provide a particular compensation for dispersion in light received therein, the controller being configured to determine, for each wavelength received from the at least one fiber, an accumulated dispersion, and cause, for each wavelength received from the at least one fiber, the WSS to send each wavelength to a particular one of the plurality of DCMs having the particular compensation corresponding to the accumulated dispersion of each wavelength.

A system for dispersion compensation for a fibered communication path, the system being configured for connection with a node of the fibered communication path. The system includes a controller; a wavelength selective switch (WSS) communicatively coupled to the controller, the WSS being configured for operatively coupling to at least one fiber of the fibered communication path; and dispersion compensation modules (DCM) optically connected to the WSS. Each DCM is configured to provide a particular compensation for dispersion in light received therein, the controller being configured to determine, for each wavelength received from the at least one fiber, an accumulated dispersion, and cause, for each wavelength received from the at least one fiber, the WSS to send each wavelength to a particular one of the plurality of DCMs having the particular compensation corresponding to the accumulated dispersion of each wavelength.

Embodiments of present invention provide a digital dispersion compensation module. The digital dispersion compensation module includes a multi-port optical circulator and a plurality of dispersion compensation units connected to the multi-port optical circulator, wherein at least one of the plurality of dispersion compensation units includes a first and a second reflectively terminated element and an optical switch being capable of selectively connecting to one of the first and second reflectively terminated elements, and wherein the at least one of the plurality of dispersion compensation units is adapted to provide a substantially zero dispersion to an optical signal, coming from the multi-port optical circulator, when the optical switch connects to the first reflectively terminated element and is adapted to provide a non-zero dispersion to the optical signal when the optical switch connects to the second reflectively terminated element.

An optical communication network includes a downstream optical transceiver. The downstream optical transceiver includes at least one coherent optical transmitter configured to transmit a downstream coherent dual-band optical signal having a left-side band portion, a right-side band portion, and a central optical carrier disposed within a guard band between the left-side band portion and the right-side band portion. The network further includes an optical transport medium configured to carry the downstream coherent dual-band optical signal from the downstream optical transceiver. The network further includes at least one modem device operably coupled to the optical transport medium and configured to receive the downstream coherent dual-band optical signal from the optical transport medium. The at least one modem device includes a downstream coherent optical receiver, and a first slave laser injection locked to a frequency of the central optical carrier.

An optical communication network includes a downstream optical transceiver. The downstream optical transceiver includes at least one coherent optical transmitter configured to transmit a downstream coherent dual-band optical signal having a left-side band portion, a right-side band portion, and a central optical carrier disposed within a guard band between the left-side band portion and the right-side band portion. The network further includes an optical transport medium configured to carry the downstream coherent dual-band optical signal from the downstream optical transceiver. The network further includes at least one modem device operably coupled to the optical transport medium and configured to receive the downstream coherent dual-band optical signal from the optical transport medium. The at least one modem device includes a downstream coherent optical receiver, and a first slave laser injection locked to a frequency of the central optical carrier.

An electro-optical chip includes a plurality of transmit macros, each of which includes an optical waveguide and a plurality of ring resonators positioned along the optical waveguide. An optical distribution network is implemented onboard the electro-optical chip and includes a plurality of optical inputs and a plurality of optical outputs. The optical distribution network conveys a portion of light received at a subset of the plurality of optical inputs to one or more of the plurality of optical outputs, such that light conveyed to said one or more of the plurality of optical outputs includes wavelengths of light conveyed to said subset of the plurality of optical inputs. The subset of the plurality of optical inputs includes at least two of the plurality of optical inputs. Each of the plurality of optical outputs is optically connected to the optical waveguide in a corresponding one of the plurality of transmit macros.