303 results about "Extinction ratio" patented technology

The invention discloses a parameter measuring device and method of an optical switch and optical communication equipment, and relates to the technical field of optical switch measurement, and the parameter measuring device of the optical switch comprises an optical path module, a signal conditioning circuit, a driving module, a signal acquisition module and an upper computer. The optical path module converts the optical signal into a current signal; the signal conditioning circuit conditions the signal into a voltage signal and amplifies the voltage signal; the driving module provides a driving signal and a synchronous triggering signal; the signal acquisition module acquires a voltage signal based on the trigger signal; the upper computer calculates performance parameters of the optical switch according to the voltage signals acquired for multiple times, wherein the performance parameters at least comprise two items of insertion loss, extinction ratio, switching time and the like; according to the technical scheme, one-key measurement of performance parameters such as insertion loss, extinction ratio, switching time, polarization-dependent loss, insertion-dependent loss and repeatability of the optical switch can be realized, meanwhile, the measurement cost of the optical switch is reduced, and the test efficiency and accuracy are improved.

The invention discloses a near-infrared flexible polarized photoelectric detector and a preparation method thereof. The photoelectric detector comprises an Sb2Se3 micron wire, a PET flexible substrate, a metal Ag electrode, a silver wire and polydimethylsiloxane (a PDMS mixture). According to the preparation method, an effective metal-semiconductor-metal (M-S-M) structure is constructed by combining the Sb2Se3 micron wire and the Ag electrode, curing packaging is carried out by adopting a PDMS mixture, the incident light transmittance is improved, meanwhile, the response speed of a device can be greatly improved through ohmic contact formed by the micron wire and the Ag electrode, and the power loss of the device is remarkably reduced. Compared with the prior art, the detector provided by the invention still keeps a stable and high extinction ratio under mechanical bending deformation, and realizes sensitive polarization, quick response and stable performance of a near-infrared band at the same time.

The invention relates to the field of performance testing of high-precision fiber-optic gyroscopes, and discloses an automatic testing method and system for the extinction ratio of a high-precision fiber-optic gyroscope, and the method comprises the following steps: constructing a signal light path and a reference light path, and combining the output light of the signal light path and the reference light path into a combined light signal in an orthogonal polarization state; integrally measuring the extinction ratio of the combined optical signal by using an extinction ratio tester to obtain a measured value; the control unit compares the measured value with a target value of 0dB and generates a control instruction based on a difference value; the voltage controller automatically adjusts the voltage of the integrated optical modulator in the signal light path according to the instruction, and iterative optimization is carried out through closed-loop feedback until the actually measured extinction ratio reaches a target value; and finally recording and solidifying the optimal voltage value. According to the invention, single and accurate extinction ratio overall measurement is used for replacing two times of error-prone independent optical power measurement, full-automatic closed-loop control is realized, the precision, efficiency and consistency of optical power balance are remarkably improved, and the skill requirements on operators are reduced.

The invention relates to an on-chip integrated polarization beam splitter which comprises a first multi-mode interference coupler, a second multi-mode interference coupler, a first waveguide and a second waveguide. The input end of the first multimode interference coupler is connected with the input waveguide, the first output end is connected with the first end of the first waveguide, and the second output end is connected with the first end of the second waveguide; the first input end of the second multimode interference coupler is connected with the second end of the first waveguide, the second input end is connected with the second end of the second waveguide, the first output end is connected with the first output waveguide, and the second output end is connected with the second output waveguide; the first waveguide and the second waveguide are the same in length and different in width, the first waveguide and the second waveguide are each provided with a thermo-optical phase shifter, and the thermo-optical phase shifters are used for conducting thermo-optical phase modulation so that the phase difference between TE polarization and TM polarization can be integer multiples of pi. According to the invention, the polarization extinction ratio can be improved.

The invention relates to a laminated staggered sub-wavelength polarization grating structure and a preparation method thereof, through staggered arrangement of a first metal grating layer and a second metal grating layer, transmission of polarized light of a transverse electric field can be effectively inhibited, and the extinction ratio is remarkably improved. Through the substrate, the first dielectric layer, the second dielectric layer, the first metal grating layer, the third dielectric layer and the second metal grating layer which are sequentially arranged from bottom to top, the whole device obtains a higher extinction ratio while keeping high transmittance, the overall structure is simple, the processing difficulty and cost are reduced, and the production efficiency is improved. And the number of the used dielectric layers and metal layers is small, the thickness requirement is low, and therefore it is ensured that the cost is controllable.

The invention discloses a feedback system for active polarization control of fiber laser and a non-polarization-maintaining fiber laser system, and relates to the field of fiber laser. The feedback system comprises an electric detection array sampling module, a calculation feedback module and a programmable gate array, the electric detection array sampling module extracts a fundamental mode component from a sampled main light beam, and N * N fundamental mode electric signals of the main light beam are obtained; the calculation feedback module inputs convergence parameters of the polarization convergence algorithm to the programmable gate array; and under the control of the calculation feedback module, the programmable gate array drives the non-polarization-maintaining fiber laser system to perform real-time polarization control by using a polarization convergence algorithm according to the feedback signal and the convergence parameter by taking the average value of the fundamental mode electric signals at the preset position in the N * N fundamental mode electric signals as the feedback signal. The polarization extinction ratio and the control bandwidth of polarization control can be improved.

The invention discloses an automatic adaptation method and device for an optical module and a switch, the optical module, a medium and a product, and relates to the technical field of optical communication, and the method comprises the steps: determining a port connected with the switch, recognizing a port identifier of the port, and querying a target voltage optical modulation amplitude value corresponding to the port identifier according to a preset mapping table; acquiring a current temperature value, and inputting the target voltage light modulation amplitude and the current temperature value into a preset fitting function to obtain target light power; and laser is emitted to the outside based on the target optical power, so that the extinction ratios of the laser at different ports and different temperatures are consistent. The adaptability and the performance stability of the optical module are improved.

The invention discloses a polarization sensitive type broadband absorber based on metal-medium stacking, and relates to the technical field of micro-nano photonic devices and infrared detection. The absorber sequentially comprises a bottom-layer high-loss metal reflecting layer, a multi-layer stacked composite dielectric cavity structure and a top-layer sub-wavelength metal grating from bottom to top, according to impedance matching and interference resonance theories, a broadband absorption substrate is constructed through a multi-layer film structure at the bottom, and light energy is converted into heat energy by utilizing the high loss characteristic of bottom layer metal; plasmon resonance is excited through the top metal grating, the coupling efficiency of TM polarized light is enhanced, and TE polarized light is cut off; the above structural design successfully realizes efficient broadband absorption and high polarization extinction ratio in an infrared band. The structure is simple in design, is compatible with a CMOS technology, and has excellent wide-angle stability. And meanwhile, polarization screening can be realized without an external polaroid, and miniaturization and integration of an infrared detection system are facilitated.

The invention discloses an extinction ratio measurement system and an extinction ratio measurement method, and relates to the technical field of optical module extinction ratio measurement. The transimpedance amplification circuit is connected with the optical module to be measured and used for monitoring the optical signal intensity of the optical module to be measured and obtaining a power monitoring voltage signal; decomposing the optical signal of the optical module to be tested to obtain a reference voltage signal and a test voltage signal; the linear output circuit is connected with the transimpedance amplification circuit and used for carrying out linear amplification on a difference value between the reference voltage signal and the test voltage signal to obtain a modulation amplitude voltage signal; and the processing circuit is respectively connected with the transimpedance amplification circuit and the linear output circuit, and is used for determining the light modulation amplitude according to the ratio of the power monitoring voltage signal to the modulation amplitude voltage signal, and determining the extinction ratio of the optical module to be detected according to the light modulation amplitude and the light power corresponding to the power monitoring voltage signal. The measurement cost of the extinction ratio of the optical module can be reduced.

The invention discloses a novel intermediate infrared double-core photonic crystal fiber polarization beam splitter based on aluminum wire filling, particularly relates to the technical field of photonic crystal fiber polarization beam splitters, and solves the technical problem that in the prior art, a compact photonic crystal fiber polarization beam splitter with a high extinction ratio and an ultra wide band in an intermediate infrared band is still scarce. According to the technical scheme, the optical fiber comprises two fiber cores and a cladding, wherein a cladding area is distributed in a hexagonal lattice mode; a plurality of circular air holes and two large circular filling holes are formed in the fiber core area, the distance between every two adjacent air holes is the same, the fiber core area comprises four small circular air holes and a central air hole, and the fiber cores are arranged in parallel and symmetrically distributed on the two sides of the central air hole. The As2S3 glass with high refractive index is used as a substrate material, aluminum is used as a metal filler, and the shortest length of 160 microns, the maximum extinction ratio of-72.1 dB and the operation bandwidth of 1020 nm are obtained at the mid-infrared band with the wavelength of 3.3 microns.

The invention discloses a thin-film barium titanate electro-optical switch unit based on a composite electrode and an array thereof. The optical switch unit comprises a first waveguide optical fiber coupling module, a second waveguide optical fiber coupling module, an optical beam splitting module, an electro-optical phase shift region, an optical beam combining module, a third waveguide optical fiber coupling module and a fourth waveguide optical fiber coupling module. Wherein the composite electrode of the electro-optic phase shift region is composed of a metal electrode and a transparent conductive layer, the electrode is closer to the waveguide by utilizing the transparent characteristic of a transparent conductive material, the coupling of a light field and an electric field is effectively enhanced, and the extinction ratio is improved. Meanwhile, a barium titanate film with a high electro-optical coefficient is adopted as a waveguide material, and the performance is further optimized, so that the electro-optical switch unit has the excellent characteristics of low-voltage driving, high extinction ratio, low insertion loss and small size.

An integrated configurable photodetector with an ultra-high circular polarization extinction ratio and a preparation method therefor are provided. The photodetector includes a metal reflective layer, a dielectric layer, an electrode layer, and a two-dimensional material layer. The electrode layer includes symmetrically arranged Z-shaped metallic optical antenna arrays which are respectively integrated with a source electrode and a drain electrode and have opposite chirality. The photodetector operates at zero bias state, and a photo-response is photovoltaic effect, hot electron injection, photo-thermoelectric effect and so on induced by a Schottky junction composed of the source electrode, the drain electrode and the two-dimensional material. By adjusting the distribution of the incident light in the source and drain electrode regions, under specific Circularly polarized light, photocurrents of equal magnitude but opposite directions cancel each other out, resulting in a net output of zero and significantly reducing noise.

The invention relates to the technical field of optical communication, and provides a polarization separation rotator and optical communication equipment. The polarization separation rotator comprises an input coupling waveguide, a ridge waveguide and a separation waveguide, and the input coupling waveguide, the ridge waveguide and the separation waveguide are sequentially arranged in the light propagation direction; the input coupling waveguide is used for coupling an input optical signal to the ridge waveguide, and the input optical signal comprises two polarization modes; the vertical section of the ridge waveguide is in a step shape to form a vertical asymmetric structure, and the vertical section is perpendicular to the light propagation direction. And the separation waveguide is used for separating the optical signals in the two polarization modes so as to respectively transmit the optical signals to different output ports. According to the polarization separation rotator provided by the invention, the defects that the size is difficult to further reduce and the polarization extinction ratio is reduced in the prior art are overcome, efficient polarization mode hybridization is realized by increasing the asymmetry in the vertical direction, and miniaturization of the polarization separation rotator is facilitated.

The invention relates to an inverse wavelength filter and a use method thereof. The inverse wavelength filter comprises a Lyot filter and a variable stress controller, wherein the Lyot filter consists of a polarization maintaining optical fiber with the length of 0.25 m and a polarizer with a high extinction ratio; the variable stress controller is connected with a section of polarization-maintaining tail fiber with the length of 0.05 m at the tail end of the polarization-maintaining optical fiber through a holder; the variable stress controller is used for continuously twisting and bending the polarization maintaining optical fiber; the distortion angle and the bending angle of the polarization-maintaining optical fiber are used for respectively controlling the central wavelength and the waveform left-right symmetry degree of an optical path passing through the polarization-maintaining optical fiber; the distortion angle and the bending angle of the polarization maintaining optical fiber are in linear relation with the driving current of the variable stress controller. According to the invention, spectral shape online correction of other optical paths such as fiber-optic gyroscopes can be realized.

The invention relates to the technical field of optical communication, in particular to a silicon optical chip monitoring method and device, electronic equipment and a computer readable storage medium, and the method comprises the steps: obtaining an input monitoring value and an output monitoring value integrated by a silicon optical chip, the input monitoring value is an input optical power value collected by an input monitoring photodiode integrated with the silicon optical chip, the output monitoring value is an output optical power value collected by an output monitoring photodiode integrated with the silicon optical chip, and a power ratio parameter is calculated according to the input monitoring value and the output monitoring value; the power ratio parameter is compared with a preset ratio range, and when it is detected that the power ratio parameter is not in the preset ratio range, it is determined that the silicon optical chip has an optical extinction ratio abnormal risk; and outputting a detection result containing the risk that the optical extinction ratio is abnormal, so that the real-time performance of abnormal detection of the optical extinction ratio of the silicon optical chip is improved.

A system for a waveguide-based diplexer (wavelength multiplexer / demultiplexer) and polarizer having ultra-broad bandwidth, a compact footprint, low losses, fabrication robustness and a simple single etch fabrication process. The polarizer (TE-pass) is based on the phase-matched coupling of the unwanted TM0 mode in an input waveguide to the TM1 mode in a tapered directional coupler (DC), which is then guided through a low-loss bend (180-degree) and scattered in a terminator section with low back reflections. An S-bend is added before the output for filtering any residual TM0mode present in the input waveguide. The diplexer is based on a multimode interference (MMI) coupler and is designed at the first imaging length for 1550 nm wavelength resulting in a compact MMI length. In order to improve the extinction ratio, the output ports are made asymmetric in width.

This invention discloses a bimetallic hybrid metasurface that achieves polarization-selective absorption and tunable liquid immersion. The metasurface consists of a three-layer structure: a bimetallic hybrid layer, a silicon dioxide layer, and a silver reflective layer. The bimetallic hybrid layer is composed of aluminum and titanium nanoribbons. The bimetallic hybrid metasurface achieves perfect absorption of incident light under x-polarized light at the resonant wavelength and specular reflection of incident light under y-polarized light, thus exhibiting a high extinction ratio. Furthermore, the absorption peak wavelength of the metasurface can be continuously and dynamically tuned by adjusting the unit period of the metasurface or by utilizing active tuning through liquid immersion. The bimetallic hybrid metasurface proposed in this invention achieves high-contrast polarization-selective absorption and possesses advantages such as simple structure, ease of integration, and dynamic tunability, thus it can be widely applied in practical applications such as novel optical polarizers and photodetectors.

The present invention discloses a lithium niobate thin film phase modulator heterogeneously integrated with silicon nitride, belonging to the field of integrated optical gyroscopes; comprising a substrate, a silicon dioxide cladding, a lithium niobate thin film-silicon nitride optical waveguide core layer, and a modulation electrode; wherein the optical waveguide core layer is a ridge structure, comprising a lithium niobate thin film layer, a silicon nitride layer, and a silicon nitride carrier strip, satisfying single-mode transmission conditions; the silicon nitride carrier strip constitutes a multimode interference coupler, a bending unit, and a modulation arm; the multimode interference coupler adopts a one-to-two structure with a splitting ratio close to 1:1; the ridge waveguide structure is used for light transmission, and the multimode interference coupler unit is used for light splitting; simultaneously, three modulation electrodes generate an electric field, causing the light transmitted in the two modulation arms to undergo phase changes, thereby outputting two beams of light with a certain phase difference. Polarization is achieved based on the different binding effects of the ridge waveguide on the TE mode and the TM mode, that is, the loss of the TE mode and the TM mode in the waveguide is different, achieving a high polarization extinction ratio.

The application discloses a kind of parameter measuring device of optical switch and method, optical communication equipment, it is related to optical switch measurement technical field, the parameter measuring device of optical switch includes optical path module, signal conditioning circuit, drive module, signal acquisition module and host computer;Optical path module converts optical signal into current signal;Signal conditioning circuit is conditioned as voltage signal and amplifies;Drive module provides driving signal and synchronous trigger signal;Signal acquisition module is based on trigger signal and collects voltage signal;Host computer calculates the performance parameter of optical switch according to voltage signal collected multiple times, and performance parameter at least includes two items in insertion loss, extinction ratio, switching time etc.;The technical scheme of the application can realize the one-key type measurement of the performance parameter such as insertion loss, extinction ratio, switching time, polarization dependent loss, insertion dependent loss and repeatability of optical switch, while reducing the measurement cost of optical switch, improve test efficiency and accuracy.

The present invention relates to the field of infrared imaging, and discloses a pixel structure, a manufacturing method thereof, and an uncooled infrared polarization detector, including: a pixel array, a packaging structure, and an optical isolator; the pixel array includes a plurality of pixels, the packaging structure is located above the pixels and packages the pixels; the packaging structure includes a packaging matrix layer and a micro-polarizer structure layer, the packaging matrix layer is connected to the pixels, and the micro-polarizer structure layer is located on the upper surface of the packaging matrix layer; the micro-polarizer structure layer has a nanowire grid structure; the optical isolator is located between two adjacent pixels. The present invention is provided with an optical isolator between adjacent pixels, which can effectively reduce or even eliminate the optical crosstalk between adjacent pixels, effectively improve the extinction ratio of the polarization detector, and thus obtain higher polarization detection accuracy.

A split focal plane polarization detector based on the collaborative design of metasurface and pixel mesa, comprising: a metasurface structure, which selects a pixel-level full Stokes polarization-sensitive metasurface structure, including a plurality of metasurface structure units distributed in an array, for preliminary polarization decoupling and directional convergence; a focal plane pixel array that is pixel-level registered with the metasurface structure, including a multi-plane array composed of a plurality of pixels, and each pixel is provided with a mesa; the side length of each mesa ranges from 2 to 3 times the full width at half maximum of the spot converged by the metasurface structure unit, so as to balance the energy utilization efficiency of each pixel for the light field, suppress the optical signal crosstalk in the non-converging center region and even adjacent pixels, and further improve the polarization extinction ratio on the basis of the polarization decoupling of the metasurface structure. The present invention realizes preliminary polarization decoupling, and the collaborative design of the combined secondary pixel mesa suppresses the crosstalk between adjacent pixels, breaking through the polarization extinction performance of a single metasurface.

The present disclosure provides a middle wave infrared integrated polarization detector and a preparation method. The middle wave infrared integrated polarization detector comprises a plurality of polarization gratings arranged in a periodic array, a dielectric film layer and a middle wave infrared detection chip arranged in sequence. The middle wave infrared detection chip has a plurality of pn junction regions arranged in a periodic array. The pn junction regions are arranged one by one corresponding to the polarization gratings. The middle wave infrared detection chip has a plurality of isolation grooves. The isolation grooves are arranged between adjacent two polarization gratings. The isolation grooves are filled with isolation pieces. By arranging the isolation pieces in the middle wave infrared detection chip, the polarization light crosstalk of adjacent two polarization gratings is suppressed, and the extinction ratio of the middle wave infrared integrated polarization detector is improved. The preparation method of the present disclosure uses nanoimprint technology to directly process nanoscale polarization gratings on the dielectric film layer, which can improve the processing efficiency and reduce the processing cost.

The present invention provides a quantum entanglement light source device that takes advantage of the benefits of using optical fibers and can compensate for the decrease in polarization extinction ratio with a simple configuration. [Solution] A quantum entanglement light source device according to one embodiment of the present invention comprises a wavelength conversion unit capable of generating polarized light with a wavelength longer than the wavelength of the pump light, and a polarization control unit provided midway through optical fibers provided on both end faces of the wavelength conversion unit, capable of controlling the polarization direction of the pump light in the wavelength range.

The invention discloses a sub-wavelength metal wire grating microarray polarization parameter reconstruction method and device, a medium and equipment. The method comprises the following steps: obtaining detection light intensity of a target in a fixed angle direction and detection light intensity change; obtaining polarization detection light intensity based on the sum value of the detection light intensity in each fixed direction and the detection light intensity change; obtaining a first target polarization detection vector matrix according to the Stokes parameter matrix; replacing the detection light intensity in the first target polarization detection vector matrix with the polarization detection light intensity to obtain a second target polarization detection vector matrix; and inputting the second target polarization detection vector matrix and a polarization transmittance parameter, an extinction ratio parameter and a uniformity parameter of the sub-wavelength metal wire grating microarray into a pre-constructed multi-parameter joint constraint polarization parameter reconstruction network, and outputting polarization energy, polarization degree and polarization angle information after target reconstruction. According to the invention, high-precision reconstruction of polarization energy parameters, polarization degree parameters and polarization angle parameters can be provided.

The present invention relates to the field of integrated optics and provides a spot converter comprising: a substrate layer; an input waveguide disposed on the substrate layer and having a greater refractive index than the substrate layer; an output waveguide disposed on the substrate layer and having a greater refractive index than the substrate layer; and a surface plasmon waveguide disposed between and in communication with the input and output waveguides, configured to induce a surface plasmon effect in electromagnetic waves transmitted from the input waveguide. The present invention effectively addresses the issues of large size and low extinction ratio in conventional spot converters, thereby achieving a compact size and high extinction ratio, saving raw material and process costs.

The invention discloses a system for generating 532nm green light through frequency doubling of 1-micron narrow-linewidth nanosecond laser, which effectively inhibits the nonlinear threshold of an optical fiber amplifier, realizes high-power output of 1-micron narrow-linewidth nanosecond laser while ensuring high light beam quality, and realizes high-efficiency frequency conversion of a pumping nonlinear crystal. The all-fiber polarization-maintaining cascade amplifier comprises a fiber laser seed source system, a fiber pre-amplification device and a fiber main amplifier. The fiber laser seed source system adopts a direct modulation semiconductor laser, the main amplifier adopts a polarization-maintaining conical fiber as a gain medium, the all-fiber polarization-maintaining cascade amplifier outputs narrow linewidth nanosecond laser, and each part adopts an all-fiber welding mode; according to the solid cavity external frequency doubling device, narrow linewidth nanosecond laser is collimated and focused through a lens system, the polarization extinction ratio is improved through combination of a half slide and a polarization slice, meanwhile, the power of injection pump light is adjusted, finally, the laser is coupled into an LBO crystal, and the size of a light spot and the temperature of the crystal are controlled to achieve high-efficiency frequency doubling green light output.

The present application provides an optical modulator and a control method thereof. The optical modulator includes: an input waveguide for receiving an initial optical signal; a tunable ring resonator, which is coupled to the input waveguide and is used for resonating and modulating the initial optical signal and outputting a first optical signal; a feedback loop waveguide, which is coupled to the tunable ring resonator and is used for receiving and transmitting the first optical signal; a first mode converter, which is coupled to the feedback loop waveguide and is used for performing mode conversion on the first optical signal and outputting a second optical signal; the tunable ring resonator is further used for resonating and modulating the second optical signal and outputting a third optical signal; an output waveguide, which is coupled to the tunable ring resonator and is used for receiving and outputting the third optical signal. The optical signal can be subjected to secondary resonance processing through the tunable ring resonator to improve the extinction ratio of the optical signal.

The invention discloses a pulse modulation laser array chip based on a double-SOA structure, which relates to the technical field of photoelectronics and comprises a substrate, a semiconductor laser array chip, an active photon integrated chip and a photon lead waveguide structure, the semiconductor laser array chip and the active photon integrated chip are arranged on the substrate; the semiconductor laser array chip and the active photonic integrated chip are in coupling connection through a photonic lead waveguide structure, the active photonic integrated chip comprises an SOA wave combining chip or an SOA chip, and the semiconductor laser array chip comprises a first SOA structure. According to the invention, a double-SOA structure is used, the problem of light leakage in a common laser array is solved, a larger modulation range and extinction ratio are realized, combined wave emission of a plurality of laser arrays is realized, the number of laser channels is increased, and the wavelength tuning range is expanded.

The invention discloses a middle infrared band microstructure optical fiber polarization beam splitter, the polarization beam splitter comprises a centrosymmetric cladding and two fiber cores, the cladding and the fiber cores are composed of a substrate material GaS and air holes, and the cladding is located on the outer side of the fiber cores. The cladding is composed of first air circular holes and second air circular holes, and the plurality of first air circular holes are periodically arranged in a triangular lattice structure. The fiber core is composed of a first elliptical air hole, a second elliptical air hole, a third air round hole and a fourth air round hole, and the fiber core is located between the first elliptical air hole and the second elliptical air hole and is a solid core filled with a GaS substrate material. The length of the micro-structure optical fiber polarization beam splitter of the middle-infrared band is only 40 microns, and the extinction ratio at the wavelength of 4.42 microns can reach-70 dB; and single polarization output can be realized in a range of 4.29 [mu] m to 4.59 [mu] m. The device has the advantages of small size, high extinction ratio, large bandwidth and the like, adopts a single material, effectively reduces the manufacturing difficulty of the device, is easy to integrate and miniaturize, and has potential application value in the fields of mid-infrared optical fiber sensing, mid-infrared band communication, mid-infrared band environment detection, optical nonlinearity and the like.

The application discloses a continuous variable quantum key distribution method based on an inner modulation pulse light source, which comprises the following steps: a sending end provides signal light and local light to a receiving end, or the sending end provides signal light to the receiving end, and the receiving end provides local light; the receiving end interferes the signal light and the local light, and extracts a component with channel noise and initial data from the interference result; and the receiving end processes the component with channel noise and the initial data to obtain amplitude modulation information related to the channel noise, namely, an initial key. The application makes full use of the random phase difference between the front and rear pulses generated by the inner modulation pulse light source, and makes the detection result independent of the phase difference, without any phase feedback and compensation, and the modulation mode is simpler; higher light pulse extinction ratio and light pulse intensity can be obtained, so that the transmission distance is farther, and the detection efficiency is higher; the high complexity double light source frequency locking technology can be avoided, and the system complexity is reduced.