5 results about "Optical time division multiplexing" patented technology

A system includes an optical transmitter configured to modulate a pulsed laser signal based on a plurality of data signals to form a plurality of modulated optical data signals, perform optical time division multiplexing of the plurality of modulated optical data signals to obtain a multiplexed optical data signal, and transmitting the multiplexed optical data signal together with an optical clock signal derived from the pulsed laser signal; and an optical receiver comprising a clock recovery branch configured to recover the optical clock signal to a plurality of phase shift recovered optical clock signals and a data branch having a plurality of saturable absorbers (SAs), each SA being in optical communication with one of the phase shift recovered optical clock signals, and configured to receive the multiplexed optical data signal and to transmit one of the plurality of modulated optical data signals according to the recovered optical clock signal.

A system comprising an optical transmitter configured to modulate a pulsed laser signal based on a plurality of data signals to form a plurality of modulated optical data signals, to optically time-division multiplex the plurality of modulated optical data signals to obtain a multiplexed optical data signal, and to transmit the multiplexed optical data signal together with an optical clock signal derived from the pulsed laser signal; and an optical receiver comprising a clock recovery branch configured to recover the optical clock signal into a plurality of phase-shifted recovered optical clock signals and a data branch having a plurality of saturable absorbers (SAs), each SA in optical communication with one of the phase-shifted recovered optical clock signals and configured to receive the multiplexed optical data signal and to transmit one of the plurality of modulated optical data signals in accordance with the recovered optical clock signal.

The present invention proposes a TF-QKD method and device using an avalanche detector, which relates to the field of quantum communication technology. Alice and Bob each use single-wavelength optical time division multiplexing to periodically encode phase reference light and quantum signal light, and then transmit them to Charlie. Before the start of TF-QKD, a synchronous clock sends a clock signal to Alice and Bob. Alice and Bob send test pulse signals at preset times. Charlie calibrates and delay-compensates the synchronous clock based on the detection results of the test pulse signals, so that the arrival times of the test pulse signals emitted by Alice and Bob are consistent. The output signal delay from the synchronous clock to the optical switch is adjusted to align the switching time of the optical switch with the encoding period of Alice and Bob. The optical switch controls the phase reference light and quantum signal light to enter different single-photon detectors for detection according to the switching time.

The application discloses a time division multiplexing system and method based on a microstructure optical fiber EFPI hydrophone, and the system comprises a tunable laser, a continuous light with continuously switched wavelengths is outputted; an acousto-optic modulator, the continuous light is chopped into time division multiplexing pulse light; a time division multiplexing component, comprising a time division multiplexing sensing array based on the microstructure optical fiber EFPI hydrophone, time division multiplexing interference pulse light with sensing information is outputted; and an optical receiving unit, the time division multiplexing interference pulse light is received and demodulated. The microstructure optical fiber EFPI sensor has the advantages of simple and compact structure, high sensitivity, small volume and large-scale manufacturing, and is a new way to realize miniaturization of the optical fiber hydrophone. The application is applied to the field of the optical fiber hydrophone, when the tunable laser emits a series of continuously switched light at a fixed step, the signal light of each wavelength can generate an interference signal through a time division multiplexing array element, and large-scale time division multiplexing of the optical fiber EFPI hydrophone based on the microstructure is realized.