8results about How to "Compressed Pulse Width" patented technology

The invention provides a semiconductor laser. The semiconductor laser comprises an N-type electrode; a substrate, an N-type coating layer, an active region, a P-type coating layer, an ohmic contact layer and a P-type electrode are sequentially stacked on the N-type electrode; and the P-type coating layer, the ohmic contact layer and the P-type electrode form a ridge waveguide of the laser. The laser adopts a four-order collision mode-locking design, so that stable mode-locking occurrence rate, higher repetition frequency and narrower optical pulse width are realized. In addition, a quantum dot structure is adopted as a gain region, the gain spectrum is effectively broadened, the pulse width of the laser is further reduced, and the performance of the mode-locked laser is improved.

According to one aspect of this disclosure, a display device includes: a timing controller configured to generate image data, a data control signal, and a gate control signal, the gate control signal including a cutoff clock signal; a data driver configured to generate a plurality of data signals corresponding to the image data based on the data control signal, and output the data signals to a plurality of data lines; a gate driver configured to generate a plurality of gate signals based on the gate control signal, and output the gate signals to a plurality of gate lines; and a display panel including a plurality of pixels disposed in a display area and connected to the plurality of data lines and the plurality of gate lines. The timing controller stops the transmission of image data during a period when a low-power drive signal is at a logic high level, and the gate driver changes the pulse width of a gate signal among the plurality of gate signals that has a conduction level pulse overlapping with the period when the low-power drive signal is at a logic high level.

The invention provides an optical fiber laser for generating a coherent super-continuum spectrum, and relates to the technical field of optical fiber lasers, and the optical fiber laser for generating the coherent super-continuum spectrum comprises a pumping source, a wavelength division multiplexer, a first gain optical fiber, a second gain optical fiber, a dispersion delay line, a coupler, a saturable absorber, a high-nonlinearity optical fiber and a filter. According to the optical fiber laser for generating the coherent super-continuum spectrum, the high-coherence super-continuum spectrum can be directly generated in the cavity through high-order soliton dynamics, and the optical fiber laser has the advantages of being small in size, low in cost and convenient to apply.

The present invention proposes a fiber laser for generating a coherent supercontinuum spectrum, which relates to the technical field of fiber lasers. The fiber laser for generating a coherent supercontinuum spectrum comprises a pump source, a wavelength division multiplexer, a first gain fiber, a second gain fiber, a dispersion delay line, a coupler, a saturable absorber, a high nonlinear fiber, and a filter. The fiber laser for generating a coherent supercontinuum spectrum proposed by the present invention utilizes high-order soliton dynamics to directly generate a highly coherent supercontinuum spectrum in a cavity, has the advantages of small size and low cost, and is easy to apply.

The present invention discloses a layout reinforcement method for SET effect, which includes forming a layout structure with SET reinforcement effect by at least one of seamless well / substrate contact and split active area on the basis of the layout design of standard cells after adding well contact and substrate contact reinforcement, wherein seamless well / substrate contact refers to canceling the shallow trench isolation STI between the well / substrate contact and the active area, and splitting the active area refers to splitting a wider transistor into several narrower transistors. The present invention aims to solve the problem that the SET effect of global signals such as clock trees and reset networks will have a serious impact on the whole chip, and to reinforce such global signals.

The invention discloses a repetition frequency encodable femtosecond fiber laser based on a band-pass filter. The repetition frequency encodable femtosecond fiber laser comprises a pulse shaping and femtosecond pulse generating system and a pulse sequence editing system. The pulse shaping and femtosecond pulse generating system comprises a gain switch semiconductor seed source, a first non-polarization-maintaining isolator, a first fiber core amplifier, a first cladding amplifier, a first non-polarization-maintaining passive spectrum broadening optical fiber, a first non-polarization-maintaining band elimination filter, a second cladding amplifier and a second non-polarization-maintaining passive spectrum broadening optical fiber which are connected in sequence; a first optical fiber collimating mirror; and a pulse compressor. The pulse sequence editing system comprises a pulse sequence drawing device and a seed source signal triggering device which are connected in sequence; the gain switch semiconductor picosecond laser is used as a seed source, separation of coherent components and incoherent components of pulses in the frequency domain and the time domain is achieved through the passive optical fiber nonlinear effect, the pulses with the pulse width smaller than 200 fs are finally obtained after spectrum broadening, amplification and compression, and industrialization is easy to achieve on the whole.

The invention discloses a laser radar detection system and method, and belongs to the technical field of detection, and the method specifically comprises the steps that a laser source emits a pulse type detection laser sequence; the counting type photoelectric detector receives a return light signal reflected by a detected object in a field of view through two different modulation phases, and the delay between the two different modulation phases is 180 degrees. Two digital domain counting signals with different phases can be obtained, the common noise problem in an analog signal chain in the prior art is eliminated, and therefore better signal-to-noise ratio performance is shown when narrow pulse optical signals are processed.

The invention relates to a signal delay detection circuit and a signal delay detection device. The signal delay detection circuit comprises a logic processing unit and a delay indication unit; the input end of the delay indication unit is connected with the reference voltage output end of the logic processing unit; the first signal input end of the logic processing unit is connected with the output end of the excitation source, and the second signal input end of the logic processing unit is connected with the signal feedback end of the tested device; the output end of the excitation source outputs an excitation signal, the pulse width of the excitation signal is equal to a delay threshold, and the signal feedback end outputs a feedback signal for the excitation signal; the delay threshold measures whether the feedback delay exceeds the standard or not; when and only when the first signal input end receives an excitation signal and the second signal input end receives a feedback signal within a delay threshold, the reference voltage output end outputs a first reference signal to trigger the delay indication unit to output a first indication signal through the first reference signal. Based on the above scheme, the human cost is saved, and misjudgment is not easy to occur.