A first optical transceiver node comprising: a first port configured to: transmit a first unmodulated optical signal to a second optical transceiver node, wherein the first unmodulated optical signal is at a first wavelength; and receive a first modulated optical signal from the second optical transceiver node, wherein the first modulated optical signal is at the first wavelength and is a modulated version of the first unmodulated optical signal; and a second port configured to: receive a second unmodulated optical signal from the second optical transceiver node, wherein the second unmodulated optical signal is at a second wavelength; and transmit a second modulated optical signal to the second optical transceiver node, wherein the second modulated optical signal is at the second wavelength and is a modulated version of the second unmodulated optical signal; a laser configured to emit an input optical signal, wherein the input optical signal is at the first wavelength; a first splitter coupled to the laser and configured to split the input optical signal into a first local oscillator, LO, optical signal and the first unmodulated optical signal, wherein the first LO optical signal and the first unmodulated optical signal are at the first wavelength; a second splitter coupled to the first splitter and the first port and configured to pass the first unmodulated optical signal to the first port; and a receiver configured to: receive the first LO optical signal from the first splitter; receive the first modulated optical signal from the second splitter; and perform phase noise cancellation of the first modulated optical signal using the first LO optical signal, wherein the first optical transceiver node is configured to reduce a broadband back reflection interference noise between the first modulated optical signal and the second modulated optical signal by receiving the first modulated optical signal via the first port and receiving the second modulated optical signal via the second port. a first port configured to: transmit a first unmodulated optical signal to a second optical transceiver node, wherein the first unmodulated optical signal is at a first wavelength; and receive a first modulated optical signal from the second optical transceiver node, wherein the first modulated optical signal is at the first wavelength and is a modulated version of the first unmodulated optical signal; and transmit a first unmodulated optical signal to a second optical transceiver node, wherein the first unmodulated optical signal is at a first wavelength; and receive a first modulated optical signal from the second optical transceiver node, wherein the first modulated optical signal is at the first wavelength and is a modulated version of the first unmodulated optical signal; and a second port configured to: receive a second unmodulated optical signal from the second optical transceiver node, wherein the second unmodulated optical signal is at a second wavelength; and transmit a second modulated optical signal to the second optical transceiver node, wherein the second modulated optical signal is at the second wavelength and is a modulated version of the second unmodulated optical signal; receive a second unmodulated optical signal from the second optical transceiver node, wherein the second unmodulated optical signal is at a second wavelength; and transmit a second modulated optical signal to the second optical transceiver node, wherein the second modulated optical signal is at the second wavelength and is a modulated version of the second unmodulated optical signal; a laser configured to emit an input optical signal, wherein the input optical signal is at the first wavelength; a first splitter coupled to the laser and configured to split the input optical signal into a first local oscillator, LO, optical signal and the first unmodulated optical signal, wherein the first LO optical signal and the first unmodulated optical signal are at the first wavelength; a second splitter coupled to the first splitter and the first port and configured to pass the first unmodulated optical signal to the first port; and a receiver configured to: receive the first LO optical signal from the first splitter; receive the first modulated optical signal from the second splitter; and perform phase noise cancellation of the first modulated optical signal using the first LO optical signal, wherein the first optical transceiver node is configured to reduce a broadband back reflection interference noise between the first modulated optical signal and the second modulated optical signal by receiving the first modulated optical signal via the first port and receiving the second modulated optical signal via the second port. receive the first LO optical signal from the first splitter; receive the first modulated optical signal from the second splitter; and perform phase noise cancellation of the first modulated optical signal using the first LO optical signal, wherein the first optical transceiver node is configured to reduce a broadband back reflection interference noise between the first modulated optical signal and the second modulated optical signal by receiving the first modulated optical signal via the first port and receiving the second modulated optical signal via the second port.