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.

A system, method, and apparatus for continuous seed laser pulses supplied to a CW pumped pre-amplifier and/or power-amplifier chain comprises an optical modulator configured to impress pulse signals on an optical signal, a waveform generator configured to establish a structure of the optical signal, and a keep-alive circuit that generates a continuous electrical pulse pattern provided to the optical modulator, wherein the system provides a continuous seed laser pulse structure.

A system, method, and apparatus for continuous seed laser pulses supplied to a CW pumped pre-amplifier and/or power-amplifier chain comprises an optical modulator configured to impress pulse signals on an optical signal, a waveform generator configured to establish a structure of the optical signal, and a keep-alive circuit that generates a continuous electrical pulse pattern provided to the optical modulator, wherein the system provides a continuous seed laser pulse structure.

Apparatuses and methods are described for generating an optical signal in an optical network. The apparatus comprises at least a first and a second laser configured to generate a first or second series of optical pulses respectively and a polarization beam combiner (PBC). The PBC is configured to receive the first and second series of optical pulses. Each optical pulse in the first series of optical pulses is received with a first state of polarization (SOP), and each optical pulse in the second series of optical pulses is received with a second SOP. The first SOP and second SOP is orthogonal with respect to each other, and the PBC is further configured to combine the first and second series of optical pulses and to output an un-polarized optical signal. The un-polarized optical signal may help to reduce or mitigate nonlinear optical impairments caused by polarization of the optical signal.

An optical source comprising: a phase-randomised light source, the phase randomised light source further comprising:

a master light source configured to intermittently generate master light pulses, wherein the phase of each generated master light pulse has a random relationship with the phase of each subsequently generated master light pulse, and wherein a first control signal is applicable to the master light source such that the master light source intermittently generates master light pulses, wherein the first control signal comprises a first and a second modulation feature in the period of time that one master light pulse is generated, wherein each phase modulation feature comprises a perturbation in the control signal applied to the master light source;
a slave light source, wherein the slave light source is optically coupled to the master light source and is configured to receive master light pulses, and wherein a second control signal is applicable to the slave light source to cause the slave light source to generate a sequence of slave light pulses during each period of time that a master light pulse is received, such that the phase of a light pulse from a sequence has a random relationship to the phase of a light pulse from a subsequent sequence, and
wherein each sequence comprises a first and a second slave light pulse that are temporally separated by a first time interval and wherein the phase difference between the first slave light pulse and the second slave light pulse depends on the phase modulation features; and
an interference apparatus, wherein the interference apparatus is optically coupled to the slave light source and is configured to receive sequences of slave light pulses, and wherein the interference apparatus comprises an interference component and a delay element, the delay element being configured to delay the received sequences of slave light pulses by the first time interval to form delayed sequences of slave light pulses, and wherein the interference apparatus is further configured to:
interfere the received sequences of slave light pulses with the delayed sequences of slave light pulses at the interference component, such that pulses from a received sequence interfere with adjacent pulses of the delayed sequence; and
output interfered pulses, wherein the interfered pulses comprise a first and a second output pulse that have a first and second predetermined amplitude respectively and a predetermined relative phase between them.

An optical source comprising: a phase-randomised light source, the phase randomised light source further comprising:

a master light source configured to intermittently generate master light pulses, wherein the phase of each generated master light pulse has a random relationship with the phase of each subsequently generated master light pulse, and wherein a first control signal is applicable to the master light source such that the master light source intermittently generates master light pulses, wherein the first control signal comprises a first and a second modulation feature in the period of time that one master light pulse is generated, wherein each phase modulation feature comprises a perturbation in the control signal applied to the master light source;
a slave light source, wherein the slave light source is optically coupled to the master light source and is configured to receive master light pulses, and wherein a second control signal is applicable to the slave light source to cause the slave light source to generate a sequence of slave light pulses during each period of time that a master light pulse is received, such that the phase of a light pulse from a sequence has a random relationship to the phase of a light pulse from a subsequent sequence, and
wherein each sequence comprises a first and a second slave light pulse that are temporally separated by a first time interval and wherein the phase difference between the first slave light pulse and the second slave light pulse depends on the phase modulation features; and
an interference apparatus, wherein the interference apparatus is optically coupled to the slave light source and is configured to receive sequences of slave light pulses, and wherein the interference apparatus comprises an interference component and a delay element, the delay element being configured to delay the received sequences of slave light pulses by the first time interval to form delayed sequences of slave light pulses, and wherein the interference apparatus is further configured to:
interfere the received sequences of slave light pulses with the delayed sequences of slave light pulses at the interference component, such that pulses from a received sequence interfere with adjacent pulses of the delayed sequence; and
output interfered pulses, wherein the interfered pulses comprise a first and a second output pulse that have a first and second predetermined amplitude respectively and a predetermined relative phase between them.

The present application provides an optical network method and associated apparatus. The method includes: receiving uplink burst time assignment information; and enabling or disabling a laser module of a local end according to the uplink burst time assignment information.

The present application provides an optical network method and associated apparatus. The method includes: receiving uplink burst time assignment information; and enabling or disabling a laser module of a local end according to the uplink burst time assignment information.

A highly efficient optical burst transmitter is provided. An embodiment is an optical burst transmitter including a control circuit configured to output a data signal and a burst control signal and a semiconductor optical amplifier configured to output an optical data signal modulated using the data signal as an optical burst data signal controlled using the burst control signal, the optical burst transmitter including: an electric line configured to connect the control circuit and the semiconductor optical amplifier and transmit the burst control signal; and an impedance matching circuit configured to impedance-match a characteristic impedance of the electric line and the semiconductor optical amplifier with each other.

A highly efficient optical burst transmitter is provided. An embodiment is an optical burst transmitter including a control circuit configured to output a data signal and a burst control signal and a semiconductor optical amplifier configured to output an optical data signal modulated using the data signal as an optical burst data signal controlled using the burst control signal, the optical burst transmitter including: an electric line configured to connect the control circuit and the semiconductor optical amplifier and transmit the burst control signal; and an impedance matching circuit configured to impedance-match a characteristic impedance of the electric line and the semiconductor optical amplifier with each other.