8 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.

The invention discloses a multi-wavelength wavelength modulation method and system based on external cut light time division multiplexing, and the method comprises the steps: S1, injecting low-frequency superposed high-frequency current signals into lasers with different wavelengths in a laser group, achieving the wavelength modulation of the lasers, enabling the low frequencies in the light output signals of the lasers to be scanning signals, and enabling the high frequencies to be modulation signals; and S2, carrying out beam combination on the emergent light of the lasers with different wavelengths, and carrying out external light cutting treatment before beam combination so as to realize time-sharing emergent light of the lasers with different wavelengths. And S3, enabling the combined laser to pass through an etalon to generate an interference signal, and receiving the interference signal by a detector, thereby realizing multi-wavelength wavelength modulation spectrum frequency time response calibration. According to the method, the influence of unstable thermal load of the laser on wavelength calibration is avoided through an external light cutting mode, and then accurate wavelength calibration under wavelength modulation time division multiplexing is achieved.

A time-multiplexed multiview backlight, display, and method of time-multiplexed multiview backlight operation provide one or both of enhanced spatial resolution and enhanced angular resolution using time-multiplexing. The time-multiplexed multiview backlight includes a light guide configured to guide light as time-multiplexed guided light having different directions during different time intervals and an array of multibeam elements configured to scatter the time-multiplexed guided light as directional light beams. A first set of multibeam elements is configured to selectively scatter out the time-multiplexed guided light having the first direction and a second set of multibeam elements of the multibeam element array is configured to selectively scatter out the time-multiplexed guided light having the second direction. The time-multiplexed multiview display further includes an array of light valves configured to modulate the directional light beams as view pixels of a multiview image having different views in the different view directions.

The present invention discloses a multi-wavelength wavelength modulation method and system based on external chopping time division multiplexing. The method includes: S1. By injecting a current signal with low frequency superimposed on high frequency into different wavelength lasers in a laser group, wavelength modulation of the lasers is achieved, so that the low frequency in the emitted light signal of the lasers is a scanning signal and the high frequency is a modulation signal; S2. The emitted light of different wavelength lasers is combined, and external chopping processing is performed before beam combination, thereby realizing time-division emission of different wavelength lasers. S3. The combined laser passes through an etalon to generate an interference signal, which is received by a detector, thereby realizing calibration of the spectral frequency time response of multi-wavelength wavelength modulation. The present invention avoids the influence of unstable thermal load of the lasers on wavelength calibration through the method of external chopping, and thereby realizes accurate wavelength calibration under wavelength modulation time division multiplexing.

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.