# US 11,451,292 B2 · Time division multiple access optical subcarriers > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,451,292 B2 - Document ID: US11451292B2 - Status: Granted - Kind: B2 - Application number: 16/809,441 - Filed: 2020-03-04 - Published: 2020-09-10 - Granted: 2022-09-20 - Earliest claimed: 2019-03-04 - Assignees: Infinera Corporation - Applicants: Infinera Corporation - Inventors: Amir Jafari; Kuang-Tsan Wu; David F. Welch; Steven Joseph Hand; Mohamed Osman - Web page: https://patentgrep.com/patent/US11451292B2 ## CPC - H04B 7/2656: {for structure of frame, burst} - H04B 10/0773: {Network aspects, e.g. central monitoring of transmission parameters} - H04B 10/0793: {Network aspects, e.g. central monitoring of transmission parameters} - H04B 10/25: Arrangements specific to fibre transmission - H04B 10/25754: {Star network topology} - H04B 10/40: Transceivers - H04B 10/503: {Laser transmitters} - H04B 10/504: {using direct modulation} - H04B 10/505: {using external modulation} - H04B 10/548: Phase or frequency modulation - H04B 10/60: Receivers - H04B 10/61: Coherent receivers - H04B 10/613: {including phase diversity, e.g., having in-phase and quadrature branches, as in QPSK coherent receivers} - H04B 10/69: Electrical arrangements in the receiver - H04J 14/005: {Optical Code Multiplex} - H04J 14/0298: {with sub-carrier multiplexing [SCM]} - H04J 14/08: Time-division multiplex systems - H04J 99/00: Subject matter not provided for in other groups of this subclass - H04L 1/0041: {Arrangements at the transmitter end} - H04L 1/0045: {Arrangements at the receiver end} - H04L 1/0071: {Use of interleaving (interleaving per se H03M13/27)} - H04L 5/001: {the frequencies being arranged in component carriers} - H04Q 11/0005: {Switch and router aspects} - H04Q 11/0067: {Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring} - H04Q 2011/0015: {using splitting combining} - H04Q 2011/0035: {using miscellaneous components, e.g. circulator, polarisation, acousto/thermo optical} - H04Q 2011/0079: {Operation or maintenance aspects} - H04B: TRANSMISSION - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04Q: SELECTING (switches, relays, selectors H01H; wireless communication networks H04W) ## Abstract A transmitter can include a laser operable to output an optical signal; a digital signal processor operable to receive user data and provide electrical signals based on the data; and a modulator operable to modulate the optical signal to provide optical subcarriers based on the electrical signals. A first one of the subcarriers carriers carries first TDMA encoded information and second TDMA encoded information, such that the first TDMA encoded information is indicative of a first portion of the data and is carried by the first one of the subcarriers during a first time slot, and the second TDMA encoded information is indicative of a second portion of the data and is carried by the first one of the subcarriers during a second time slot. The first TDMA encoded information is associated with a first node remote from the transmitter and the second TDMA encoded information is associated with a second node remote from the transmitter. A second one of the subcarriers carries third information that is not TDMA encoded, the third information being associated with a third node remote from the transmitter. A receiver and system also are described. ## Claims ### Claim 1 A transmitter, comprising: a laser operable to output an optical signal; a digital signal processor operable to receive user data and provide a plurality of electrical signals based on the data; a modulator operable to modulate the optical signal to provide a plurality of optical subcarriers based on the plurality of electrical signals, a first one of the plurality of subcarriers carries first TDMA encoded information and second TDMA encoded information, such that the first TDMA encoded information includes a first portion of the data and is carried by the first one of the plurality of subcarriers during a first time slot, and the second TDMA encoded information includes a second portion of the data and is carried by the first one of the plurality of subcarriers during a second time slot, the first TDMA encoded information being associated with a first node remote from the transmitter and the second TDMA encoded information being associated with a second node remote from the transmitter, wherein a second one of the plurality of subcarriers carries third information that is not TDMA encoded, the third information being associated with a third node remote from the transmitter, and wherein the digital signal processor includes a burst slot circuit, the burst slot circuit providing time slot data that includes the first information during the first time slot. ### Claim 2 (depends on 1) The transmitter in accordance with claim 1, wherein each of the plurality of optical subcarriers is a Nyquist subcarrier. ### Claim 3 (depends on 1) The transmitter in accordance with claim 1, wherein each of the plurality of optical subcarriers does not spectrally overlap with another of the plurality of optical subcarriers. ### Claim 4 (depends on 1) The transmitter in accordance with claim 1, wherein the digital signal processor includes: a forward error correction encoder that receives the first portion of the data and provides encoded data; a bit-to-symbol mapper circuit that provides symbol information based on the encoded data, the burst slot circuit providing time slot data based on the symbol information. ### Claim 5 (depends on 4) The transmitter in accordance with claim 4, further including a scheduler circuit that supplies a first output to the first burst slot circuit and a second output and a second output to the second burst slot circuit, such that a timing of an output of the first time slot data and the second time slot data is controlled based on the first and second outputs, respectively, of the scheduler circuit. ### Claim 6 (depends on 1) The transmitter in accordance with claim 1, further including a scheduler circuit that supplies an output to the burst slot circuit, such that a timing of an output of the time slot data is controlled based on the output of the scheduler circuit. ### Claim 7 (depends on 1) The transmitter in accordance with claim 1, further including a first switch coupled to the digital signal processor, such that, based on a configuration of the switch, the modulator supplies the third optical subcarrier carrying non-TDMA encoded information. ### Claim 8 (depends on 1) The transmitter in accordance with claim 1, further including a switch coupled to the digital signal processor, such that, based on a configuration of the switch, the modulator supplies the second optical subcarrier carrying the third information. ### Claim 9 The transmitter, comprising: a laser operable to output an optical signal; a digital signal processor operable to receive user data and provide a plurality of electrical signals based on the data; a modulator operable to modulate the optical signal to provide a plurality of optical subcarriers based on the plurality of electrical signals, a first one of the plurality of subcarriers carriers carries first TDMA encoded information and second TDMA encoded information, such that the first TDMA encoded information includes a first portion of the data and is carried by the first one of the plurality of subcarriers during a first time slot, and the second TDMA encoded information includes a second portion of the data and is carried by the first one of the plurality of subcarriers during a second time slot, the first TDMA encoded information being associated with a first node remote from the transmitter and the second TDMA encoded information being associated with a second node remote from the transmitter, wherein a second one of the plurality of subcarriers carries third information that is not TDMA encoded, the third information being associated with a third node remote from the transmitter, wherein the digital signal processor includes: a first burst slot circuit, the first burst slot circuit providing first time slot data that includes the first information during the first time slot; and a second burst slot circuit, the second burst slot circuit providing second time slot data that includes the second information during the second time slot. ### Claim 10 (depends on 9) The transmitter in accordance with claim 9, wherein the digital signal processor includes: a first forward error correction encoder that receives the first portion of the data and provides first encoded data; a first bit-to-symbol mapper circuit that provides first symbol information based on the first encoded data, the first burst slot circuit providing first time slot data based on the first symbol information; and a second bit-to-symbol mapper circuit that provides second symbol information based on the second encoded data, the second burst slot circuit providing second time slot data based on the second symbol information. ### Claim 11 (depends on 10) The transmitter in accordance with claim 10, further including an adder circuit that adds the first time slot data and the second time slot data. ### Claim 12 A system, comprising: a transmitter, including: a laser operable to output an optical signal, a digital signal processor operable to receive data and provide a plurality of electrical signals based on the data, and a modulator operable to modulate the optical signal to provide a plurality of optical subcarriers based on the plurality of electrical signals, a first one of the plurality of subcarriers carries first information during a first time slot and second information during a second time slot, and a second one of the plurality of subcarriers carries third information; a first receiver provided in a first node, the first receiver receiving being optically coupled to the transmitter; a second receiver provided in a second node, the second receiver being optical coupled to the transmitter, the first and second receivers being remote from the transmitter, such that the first information is associated with the first node and the second information is associated with a second node remote from the transmitter; and a third receiver provided in a third node, the third receiver being remote from the transmitter, such that the third information is associated with the third node, wherein the digital signal processor includes a burst slot circuit, the burst slot circuit providing time slot data includes the first information during the first time slot. ### Claim 13 (depends on 12) The system in accordance with claim 12, wherein the first and second information is time division multiple access (TDMA) encoded. ### Claim 14 (depends on 12) The system in accordance with claim 12, wherein each of the plurality of optical subcarriers is a Nyquist subcarrier. ### Claim 15 (depends on 12) The system in accordance with claim 12, wherein each of the plurality of optical subcarriers does not spectrally overlap with another of the plurality of optical subcarriers. ### Claim 16 (depends on 12) The system in accordance with claim 12, wherein the digital signal processor includes: a forward error correction encoder that receives the first portion of the data and provides encoded data; a bit-to-symbol mapper circuit that provides symbol information based on the encoded data, the burst slot circuit providing time slot data based on the symbol information. ### Claim 17 (depends on 16) The system in accordance with claim 16, further including a scheduler circuit that supplies a first output to the first burst slot circuit and a second output and a second output to the second burst slot circuit, such that a timing of an output of the first time slot data and the second time slot data is controlled based on the first and second outputs, respectively, of the scheduler circuit. ### Claim 18 (depends on 12) A system in accordance with claim 12, further including a scheduler circuit that supplies an output to the burst slot circuit, such that a timing of an output of the time slot data is controlled based on the output of the scheduler circuit. ### Claim 19 (depends on 12) The system in accordance with claim 12, further including a switch coupled to the digital signal processor, such that, based on a configuration of the switch, the modulator supplies the second optical subcarrier carrying the third information. ### Claim 20 A system, comprising: a transmitter, including: a laser operable to output an optical signal, a digital signal processor operable to receive data and provide a plurality of electrical signals based on the data, and a modulator operable to modulate the optical signal to provide a plurality of optical subcarriers based on the plurality of electrical signals, a first one of the plurality of subcarriers carries first information during a first time slot and second information during a second time slot, and a second one of the plurality of subcarriers carries third information; a first receiver provided in a first node, the first receiver receiving being optically coupled to the transmitter; a second receiver provided in a second node, the second receiver being optical coupled to the transmitter, the first and second receivers being remote from the transmitter, such that the first information is associated with the first node and the second information is associated with a second node remote from the transmitter; and a third receiver provided in a third node, the third receiver being remote from the transmitter, such that the third information is associated with the third node, wherein the digital signal processor includes: a first burst slot circuit, the first burst slot circuit providing first time slot data that includes the first information during the first time slot; and a second burst slot circuit, the second burst slot circuit providing second time slot data that includes the second information during the second time slot. ### Claim 21 (depends on 20) The system in accordance with claim 20, wherein the digital signal processor includes: a first forward error correction encoder that receives the first portion of the data and provides first encoded data; a first bit-to-symbol mapper circuit that provides first symbol information based on the first encoded data, the first burst slot circuit providing first time slot data based on the first symbol information; and a second bit-to-symbol mapper circuit that provides second symbol information based on the second encoded data, the second burst slot circuit providing second time slot data based on the second symbol information. ### Claim 22 (depends on 21) The system in accordance with claim 21, further including an adder circuit that adds the first time slot data and the second time slot data. ### Claim 23 A receiver, comprising: a local oscillator laser; an optical hybrid circuit that receives a plurality of optical subcarriers and an optical signal supplied from the local oscillator laser, the optical hybrid circuit supplying a plurality of mixing products, one of the plurality of optical subcarriers carrying first information during a first time slot and second information during a second time slot, and a second one of the plurality of optical subcarriers carrying third information, the first information being designated for the receiver and the second and third information being designated for another first receiver and another second receiver, respectively; a photodiode circuit that receives the plurality of mixing products and outputs a plurality of electrical signals; a digital signal processor that outputs, based on the plurality of electrical signals, data associated with the first information, wherein the data is first data, further including a switch, such that, when the switch has a first configuration, the receiver outputs the first data, and, when the switch has a second configuration, the receiver outputs second data associated with the third information carried by the second subcarrier. ### Claim 24 (depends on 23) The receiver in accordance with claim 23, wherein the first and second information is time division multiple access (TDMA) encoded. ### Claim 25 (depends on 23) The receiver in accordance with claim 23, wherein each of the plurality of optical subcarriers is a Nyquist subcarrier. ### Claim 26 (depends on 23) The receiver in accordance with claim 23, wherein each of the plurality of optical subcarriers does not spectrally overlap with another of the plurality of optical subcarriers.