Abstract: A method for generating millimeter wave noise with a flat RF (radio frequency) spectrum includes the following steps. A noise optical signal with an optical spectrum in Gaussian shape is output by a first optical emission module. The noise optical signal is transmitted to an optical coupler. n beams of noise optical signals with optical spectra in Gaussian shape is output by a second optical emission module. The noise optical signals is transmitted to the optical coupler. The noise light generated by the first optical emission module and the second optical emission module is coupled to the optical coupler. The coupled optical signals is transmitted to a photodetector. The beat frequency is performed by the photodetector to realize mapping transformation from the optical spectra to the RF spectra. The flat millimeter wave noise is output.

Abstract: A method for generating millimeter wave noise with a flat RF (radio frequency) spectrum includes the following steps. A noise optical signal with an optical spectrum in Gaussian shape is output by a first optical emission module. The noise optical signal is transmitted to an optical coupler. n beams of noise optical signals with optical spectra in Gaussian shape is output by a second optical emission module. The noise optical signals is transmitted to the optical coupler. The noise light generated by the first optical emission module and the second optical emission module is coupled to the optical coupler. The coupled optical signals is transmitted to a photodetector. The beat frequency is performed by the photodetector to realize mapping transformation from the optical spectra to the RF spectra. The flat millimeter wave noise is output.

Abstract: The method of transmitting data includes encoding, at an optical line terminal, data to be transmitted over a plurality of wavelength channels; providing the encoded data to corresponding lasers as modulation inputs, to enable the lasers to generate optical signals representing the data; multiplexing the optical signals; and equalizing the multiplexed optical signals for transmission via an optical transmission link. The method of receiving data includes de-multiplexing, at an optical network unit, optical signals received from an optical transmission link; selecting, from the de-multiplexed optical signals, an optical signal corresponding to a particular wavelength channel; converting the selected optical signal into electric signals; and decoding the electric signal to determine the data.

Abstract: The method of transmitting data includes encoding, at an optical line terminal, data to be transmitted over a plurality of wavelength channels; providing the encoded data to corresponding lasers as modulation inputs, to enable the lasers to generate optical signals representing the data; multiplexing the optical signals; and equalizing the multiplexed optical signals for transmission via an optical transmission link. The method of receiving data includes de-multiplexing, at an optical network unit, optical signals received from an optical transmission link; selecting, from the de-multiplexed optical signals, an optical signal corresponding to a particular wavelength channel; converting the selected optical signal into electric signals; and decoding the electric signal to determine the data.

Abstract: A transmitter for an optical network unit, includes a 2.5 Gb/s direct modulation laser, for generating an uplink optical signal; wherein the direct modulation laser is driven by a modulation current and a bias current, and the bias current is configured to be greater than a threshold current of the direct modulation laser, and an amplitude of the modulation current is such configured that a difference between a frequency of 1 bit and a frequency of 0 bit of the uplink optical signal is a half of a transmission rate of the uplink optical signal.

Abstract: A remote node device for mutual communication between optical network units in a passive optical network includes an N×N-arrayed waveguide grating configured to receive upstream optical signal of one of the optical network units and to output this signal as a first optical signal; a 1×2 wavelength division multiplexer configured to separate per band the first optical signal to obtain a second optical signal; and a 1×(N?1) power distributor configured to transmit the second optical signal to the corresponding optical network unit through the N×N-arrayed waveguide grating.

Abstract: The optical transmitter includes a FP-LD, generating multiple-longitudinal mode light wave. The FP-LD is also driven by an electrical signal, modulates the electrical signal to the multiple-longitudinal mode light wave, and outputts the modulated multiple-longitudinal mode light wave. An optical coupler, coupled with the FP-LD, is used for feeding the modulated multiple-longitudinal mode light wave from the FP-LD to a fiber Bragg grating. The fiber Bragg grating is for filtering the received multiple-longitudinal mode light wave according to a parameter, and feeding back the optical signal generated after being filtered to the optical coupler. The optical coupler divides the optical signal, thus making the optical signal oscillate between the FP-LD and the fiber Bragg grating to form a oscillation cavity, and outputs a single mode optical wave with constant wavelength and power.

Abstract: A remote node device for mutual communication between optical network units in a passive optical network includes an N×N-arrayed waveguide grating configured to receive upstream optical signal of one of the optical network units and to output this signal as a first optical signal; a 1×2 wavelength division multiplexer configured to separate per band the first optical signal to obtain a second optical signal; and a 1×(N?1) power distributor configured to transmit the second optical signal to the corresponding optical network unit through the N×N-arrayed waveguide grating.

Abstract: The optical transmitter includes a FP-LD, generating multiple-longitudinal mode light wave. The FP-LD is also driven by an electrical signal, modulates the electrical signal to the multiple-longitudinal mode light wave, and outputts the modulated multiple-longitudinal mode light wave. An optical coupler, coupled with the FP-LD, is used for feeding the modulated multiple-longitudinal mode light wave from the FP-LD to a fiber Bragg grating. The fiber Bragg grating is for filtering the received multiple-longitudinal mode light wave according to a parameter, and feeding back the optical signal generated after being filtered to the optical coupler. The optical coupler divides the optical signal, thus making the optical signal oscillate between the FP-LD and the fiber Bragg grating to form a oscillation cavity, and outputs a single mode optical wave with constant wavelength and power.