# US 2025/0211360 A1 · Multi-carrier transmitter with integrated multiplexer and receiver with integrated demultiplexer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0211360 A1 - Document ID: US20250211360A1 - Status: Published application - Kind: A1 - Application number: 19/074,975 - Filed: 2025-03-10 - Published: 2025-06-26 - Earliest claimed: 2022-09-07 - Assignees: Lumentum Operations LLC - Applicants: Lumentum Operations LLC - Inventors: Joe Qingzhe WEN; Zhong PAN - Web page: https://patentgrep.com/patent/US20250211360A1 ## CPC - H04J 14/06: Polarisation multiplex systems - H04B 10/613: {including phase diversity, e.g., having in-phase and quadrature branches, as in QPSK coherent receivers} - H04B 10/614: {comprising one or more polarization beam splitters, e.g. polarization multiplexed [PolMux] X-PSK coherent receivers, polarization diversity heterodyne coherent receivers (H04J14/06 takes precedence)} - H04B 10/615: {Arrangements affecting the optical part of the receiver} - H04B 10/6163: {Compensation of non-linear effects in the fiber optic link, e.g. self-phase modulation [SPM], cross-phase modulation [XPM], four wave mixing [FWM]} - 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) - H04B: TRANSMISSION ## Abstract In some implementations, an optical receiver includes a polarization beam splitter configured to split a reception signal into a first polarization reception signal and a second polarization reception signal, a first demultiplexing component configured to demultiplex the first polarization reception signal into a first optical signal and a second optical signal associated with a first polarization, a second demultiplexing component configured to demultiplex the second polarization reception signal into a third optical signal and a fourth optical signal associated with a second polarization, a first demodulation component configured to mix the first optical signal and the third optical signal with a first local oscillator signal to demodulate the first optical signal and the third optical signal, and a second demodulation component configured to mix the second optical signal and the fourth optical signal with a second local oscillator signal to demodulate the second optical signal and the fourth optical signal. ## Claims ### Claim 1 An optical device, comprising: an optical transmitter, comprising: a first modulation component configured to modulate a first optical carrier signal to generate a first modulation signal and a second modulation signal; a second modulation component configured to modulate a second optical carrier signal, different than the first optical carrier signal, to generate a third modulation signal and a fourth modulation signal; a first polarization beam combiner configured to combine the first modulation signal and the second modulation signal, wherein a first polarization rotator, configured to be between the first modulation component and the first polarization beam combiner, is further configured to rotate a first polarization of the second modulation signal; a second polarization beam combiner configured to combine the third modulation signal and the fourth modulation signal, wherein a second polarization rotator, configured to be between the second modulation component and the second polarization beam combiner, is further configured to rotate a second polarization of the fourth modulation signal; an optical receiver, comprising: a first polarization beam splitter configured to split a first reception signal into a first optical signal and a second optical signal; a second polarization beam splitter configured to split a second reception signal into a third optical signal and a fourth optical signal; a first demodulation component configured to mix the first optical signal and the second optical signal with a first local oscillator signal to demodulate the first optical signal and the second optical signal, wherein a third polarization rotator, configured to be between the first polarization beam splitter and the first demodulation component, is further configured to rotate a third polarization of the second optical signal; and a second demodulation component configured to mix the third optical signal and the fourth optical signal with a second local oscillator signal to demodulate the third optical signal and the fourth optical signal, wherein a third polarization rotator, configured to be between the second polarization beam splitter and the second demodulation component, is further configured to rotate a fourth polarization of the fourth optical signal. ### Claim 2 (depends on 1) The optical device of claim 1, wherein the optical transmitter further comprises a multiplexing component configured to generate an output signal by multiplexing a first output of the first polarization beam combiner and a second output of the second polarization beam combiner, and wherein the multiplexing component comprises a delay line interferometer (DLI), a multimode interferometer (MMI), or a waveguide combiner. ### Claim 3 (depends on 1) The optical device of claim 1, wherein the optical receiver further comprises: a demultiplexing component configured to demultiplex a reception signal into the first reception signal and the second reception signal. ### Claim 4 (depends on 3) The optical device of claim 3, wherein the demultiplexing component comprises a delay line interferometer (DLI), a multimode interferometer (MMI), or a waveguide combiner. ### Claim 5 (depends on 1) The optical device of claim 1, wherein the optical transmitter further comprises a multiplexing component configured to generate an output signal by multiplexing a first output of the first polarization beam combiner and a second output of the second polarization beam combiner, and wherein the multiplexing component is tunable as to phase delay. ### Claim 6 (depends on 1) The optical device of claim 1, further comprising: a first optical carrier signal source to generate the first optical carrier signal; and a second optical carrier signal source to generate the second optical carrier signal. ### Claim 7 (depends on 1) The optical device of claim 1, wherein a frequency of the first local oscillator signal corresponds to a frequency of the first optical carrier signal, and wherein a frequency of the second local oscillator signal corresponds to a frequency of the second optical carrier signal. ### Claim 8 (depends on 1) The optical device of claim 1, wherein the optical transmitter further comprises a multiplexing component configured to generate an output signal by multiplexing a first output of the first polarization beam combiner and a second output of the second polarization beam combiner. ### Claim 9 (depends on 1) The optical device of claim 1, wherein signal sources are shared by the optical transmitter and the optical receiver. ### Claim 10 (depends on 1) The optical device of claim 1, wherein the first modulation component is a dual polarization (DP) and an in-phase and quadrature (IQ) modulator. ### Claim 11 An optical transmitter, comprising: a first modulation component configured to modulate a first optical carrier signal to generate a first modulation signal and a second modulation signal; a second modulation component configured to modulate a second optical carrier signal, different than the first optical carrier signal, to generate a third modulation signal and a fourth modulation signal; a first polarization beam combiner configured to combine the first modulation signal and the second modulation signal, wherein a first polarization rotator, configured to be between the first modulation component and the first polarization beam combiner, is further configured to rotate a first polarization of the second modulation signal; a second polarization beam combiner configured to combine the third modulation signal and the fourth modulation signal, wherein a second polarization rotator, configured to be between the second modulation component and the second polarization beam combiner, is further configured to rotate a second polarization of the fourth modulation signal; and a multiplexing component configured to generate an output signal by multiplexing a first output of the first polarization beam combiner and a second output of the second polarization beam combiner. ### Claim 12 (depends on 11) The optical transmitter of claim 11, wherein the multiplexing component comprises a delay line interferometer (DLI), a multimode interferometer (MMI), or a waveguide combiner. ### Claim 13 (depends on 11) The optical transmitter of claim 11, wherein the multiplexing component is tunable as to phase delay. ### Claim 14 (depends on 11) The optical transmitter of claim 11, wherein the first optical carrier signal is generated by a first optical carrier signal source that is a tunable laser. ### Claim 15 (depends on 14) The optical transmitter of claim 14, wherein the second optical carrier signal is generated by a second optical carrier signal source that is another tunable laser, and wherein the second optical carrier signal is different from the first optical carrier signal. ### Claim 16 (depends on 11) The optical transmitter of claim 11, wherein the first modulation component is a dual polarization (DP) and an in-phase and quadrature (IQ) modulator. ### Claim 17 An optical receiver, comprising: a first polarization beam splitter configured to split a first reception signal into a first optical signal and a second optical signal; a second polarization beam splitter configured to split a second reception signal into a third optical signal and a fourth optical signal; a first demodulation component configured to mix the first optical signal and the second optical signal with a first local oscillator signal to demodulate the first optical signal and the second optical signal, wherein a third polarization rotator, configured to be between the first polarization beam splitter and the first demodulation component, is further configured to rotate a third polarization of the second optical signal; a second demodulation component configured to mix the third optical signal and the fourth optical signal with a second local oscillator signal to demodulate the third optical signal and the fourth optical signal, wherein a third polarization rotator, configured to be between the second polarization beam splitter and the second demodulation component, is further configured to rotate a fourth polarization of the fourth optical signal; and a demultiplexing component configured to demultiplex a reception signal into the first reception signal and the second reception signal. ### Claim 18 (depends on 17) The optical receiver of claim 17, wherein the demultiplexing component comprises a delay line interferometer (DLI), a multimode interferometer (MMI), or a waveguide combiner. ### Claim 19 (depends on 17) The optical receiver of claim 17, wherein the first demodulation component and the second demodulation component are optical hybrid mixers. ### Claim 20 (depends on 17) The optical receiver of claim 17, wherein a first oscillator source of the first local oscillator signal is a first tunable laser, and wherein a second oscillator source of the second local oscillator signal is a second tunable laser.