Signal transmission method, signal receiving method, passive optical network pon device, and pon system

A receiver, comprising a first power splitter, a first director of a first optical signal, a polarization rotator of light, and a coherent receiver, wherein

• the first power splitter splits a first transmit signal sent by a transmitting end into a first signal and a second signal according to power, inputs the first signal to the coherent receiver, and inputs the second signal to the first director of the first optical signal, wherein the first transmit signal comprises a first polarized optical signal and a second polarized optical signal having polarizations that are perpendicular to each other, wherein the first polarized optical signal is loaded with first data;
• the first director of the first optical signal is connected to the polarization rotator of light, and the first director of the first optical signal is configured to input the second signal to the polarization rotator of light;
• the polarization rotator of light separately rotates a first polarized optical signal and a second polarized optical signal of the second signal by 90 degrees, and inputs the rotated second signal to the first director of the first optical signal;
• and the first director of the first optical signal inputs the rotated second signal to the coherent receiver;
• and
• the coherent receiver performs coherent mixing on the rotated second signal and the first signal to obtain the first data.

A passive optical network (PON) system, comprising at least one PON central office device and at least one PON terminal device

• wherein the at least one PON central office device comprises a first transmitter, wherein the first transmitter comprises a signal source, a polarization beam splitter, a modulator, and a polarization beam combiner, wherein
• the signal source generates an optical signal, and inputs the optical signal to the polarization beam splitter;
• the polarization beam splitter splits the optical signal into a first polarized optical signal and a second polarized optical signal having polarizations that are perpendicular to each other, inputs the first polarized optical signal to the modulator, and inputs the second polarized optical signal to the polarization beam combiner;
• the modulator modulates the first polarized optical signal, loads first data into the first polarized optical signal, and inputs the modulated first polarized optical signal to the polarization beam combiner;
• and
• the polarization beam combiner synthesizes the modulated first polarized optical signal and the second polarized optical signal into a first transmit signal, and transmits the first transmission signal to a receiving end, wherein the first data is downlink data, the first transmit signal is a downlink signal, and the receiving end is the at least one PON terminal device;
• wherein the at least one PON terminal device comprises a receiver, wherein the receiver comprises a first power splitter, a first director of a first optical signal, a polarization rotator of light, and a coherent receiver, wherein
• the first power splitter splits a first transmit signal sent by a transmitting end into a first signal and a second signal according to power, inputs the first signal to the coherent receiver, and inputs the second signal to the first director of the first optical signal, wherein the first transmit signal comprises a first polarized optical signal and a second polarized optical signal having polarizations that are perpendicular to each other, wherein the first polarized optical signal includes first data;
• the first director of the first optical signal is connected to the polarization rotator of light, and the first director of the first optical signal inputs the second signal to the polarization rotator of light;
• the polarization rotator of light separately rotates a first polarized optical signal and a second polarized optical signal of the second signal by 90 degrees, and input the rotated second signal to the first director of the first optical signal;
• and the first director of the first optical signal inputs the rotated second signal to the coherent receiver;
• and
• the coherent receiver performs coherent mixing on the rotated second signal and the first signal to obtain the first data;
• wherein the first data is downlink data, the first transmit signal is a downlink signal, and the transmitting end is the at least one PON central office device.

A passive optical network (PON) system, comprising at least one PON terminal device and at least one PON central office device;

• wherein the at least one PON terminal device comprises a first transmitter, wherein the first transmitter comprises a signal source, a polarization beam splitter, a modulator, and a polarization beam combiner, wherein
• the signal source generates an optical signal, and inputs the optical signal to the polarization beam splitter;
• the polarization beam splitter splits the optical signal into a first polarized optical signal and a second polarized optical signal having polarizations that are perpendicular to each other, inputs the first polarized optical signal to the modulator, and inputs the second polarized optical signal to the polarization beam combiner;
• the modulator modulates the first polarized optical signal, loads first data into the first polarized optical signal, and inputs the modulated first polarized optical signal to the polarization beam combiner;
• and
• the polarization beam combiner synthesizes the modulated first polarized optical signal and the second polarized optical signal into a first transmit signal, and transmits the first transmission signal to a receiving end, wherein the first data is uplink data, the first transmit signal is an uplink signal, and the receiving end is the at least one PON central office device;
• wherein the at least one PON central office device comprises a receiver, wherein the receiver comprises a first power splitter, a first director of a first optical signal, a polarization rotator of light, and a coherent receiver, wherein
• the first power splitter splits a first transmit signal sent by a transmitting end into a first signal and a second signal according to power, inputs the first signal to the coherent receiver, and inputs the second signal to the first director of the first optical signal, wherein the first transmit signal comprises a first polarized optical signal and a second polarized optical signal having polarizations that are perpendicular to each other, wherein the first polarized optical signal includes the first data;
• the first director of the first optical signal is connected to the polarization rotator of light, and the first director of the first optical signal inputs the second signal to the polarization rotator of light;
• the polarization rotator of light separately rotates a first polarized optical signal and a second polarized optical signal of the second signal by 90 degrees, and inputs the rotated second signal to the first director of the first optical signal;
• and the first director of the first optical signal inputs the rotated second signal to the coherent receiver;
• and
• the coherent receiver performs coherent mixing on the rotated second signal and the first signal to obtain the first data, wherein the first data is uplink data, the first transmit signal is an uplink signal, and the transmitting end is a PON terminal device.

A signal transmission method, comprising:

• splitting an optical signal into a first polarized optical signal and a second polarized optical signal having polarizations that are perpendicular to each other;
• modulating the first polarized optical signal, and loading first data into the first polarized optical signal;
• and
• synthesizing the modulated first polarized optical signal and the second polarized optical signal into a first transmit signal, and transmitting the first transmit signal to a receiving end, wherein the first data is uplink data and the first transmit signal is an uplink signal, or the first data is downlink data and the first transmit signal is a downlink signal.

A signal receiving method, comprising:

• receiving a first transmit signal, wherein the first transmit signal comprises a first polarized optical signal and a second polarized optical signal having polarizations that are perpendicular to each other, wherein the first polarized optical signal includes first data, the first transmit signal is an uplink signal, and the first data is uplink data, or the first transmit signal is a downlink signal and the first data is downlink data;
• splitting the first transmit signal into a first signal and a second signal according to power;
• separately rotating a first polarized optical signal and a second polarized optical signal of the second signal by 90 degrees;
• and
• performing coherent mixing on the rotated second signal and the first signal to obtain the first data.