33results about How to "Polarization stabilization" patented technology

The invention discloses a fiber-optic gyroscope resonant cavity chip based on a tunable surface plasmon coupler. The chip comprises a first embedded polarization maintaining optical fiber and a second polarization maintaining optical fiber, which are used to conduct optical signals and stabilize the polarization state of the optical signals; an embedded curved polarization maintaining optical fiber; and a tunable surface plasmon coupler, which is used to adjust the coupling ratio of resonant cavity and realize single-polarization transmission of optical singles in the resonant cavity. The embedded curved polarization maintaining optical fiber and the tunable surface plasmon coupler form a resonant cavity; and the tunable surface plasmon coupler is a surface plasmon waveguide coupler. The first embedded polarization maintaining optical fiber, the second embedded polarization maintaining optical fiber, and the embedded curved polarization maintaining optical fiber are embedded in the peripheral layer of the tunable surface plasmon coupler and butt-jointed with the tunable surface plasmon coupler. The polarization maintaining optical fibers and the tunable surface plasmon coupler are integrated in a same chip, and the whole solid state of chip is realized, so the resonant cavity is more stable compared with conventional resonant cavity of fiber-optic gyroscope, and polarization noise is eliminated.

The invention discloses a method and system for generating a polarization state of a high-order Poincare sphere with robustness. The method comprises the following steps of: loading a vortex phase on a completely coherent vector light beam, and then regulating and controlling the completely coherent vector light beam into left-handed circularly polarized light and right-handed circularly polarized light of the high-order Poincare sphere; synthesizing the left-handed circularly polarized light and the right-handed circularly polarized light into vector polarized light on the high-order Poincare sphere, and generating a polarization matrix of the high-order Poincare sphere through adjustment; reducing the spatial coherence of the polarized light, obtaining a random electromagnetic beam through shaping, and extracting polarization information in a polarization matrix to a spatial correlation tensor of the random electromagnetic beam; transmitting a random electromagnetic beam to a far field, in the far field, transferring polarization information from a space correlation tensor to a polarization matrix of the random electromagnetic beam, and obtaining a high-order Poincare sphere polarization state with robust characteristics. The problems that an existing high-order Poincare spherical polarized beam is difficult to generate, does not have the robust characteristic and is easily damaged by the external environment are solved.

The invention discloses an annular laser gyro for an unmanned navigation chip. The annular laser gyro comprises a pumping light source and a gyro chip of an excimer resonant cavity, wherein the gyro chip of the excimer resonant cavity comprises the excimer resonant cavity, a first resonant cavity, a second resonant cavity, a third resonant cavity, a gain medium and a group connection fiber are arranged in the excimer resonant cavity, the group connection fiber, the first resonant cavity, the second resonant cavity and the third resonant cavity form a self-interference denoising resonant cavity, a first coupler is arranged between the first resonant cavity and the second resonant cavity, and a second coupler is arranged between the second resonant cavity and the third resonant cavity. In the annular laser gyro for the unmanned navigation chip, three parallel resonant cavities form a large resonant cavity system, and the rotation phase difference between clockwise optical interference and counter-clockwise optical interference which are generated by rotation is further improved; and compared with a traditional fiber resonant cavity, the annular laser gyro has more stability, the types and the numbers of components are reduced, and the circuit complexity is simplified.

The invention relates to the technical field of integrated optics, in particular to a polarizer and a preparation method thereof. The polarizer comprises a supporting layer and a mode screening layer,wherein the supporting layer is used for supporting the mode screening layer; the mode screening layer comprises a light absorption layer and a light isolation layer, wherein the light absorption layer is arranged on the supporting layer, and the light isolation layer is arranged on the light absorption layer; the light absorption layer is used for absorbing light in a preset optical waveguide mode; the light absorption layer can selectively absorb light waves in a TM mode and other high-order modes; and the light isolation layer can limit the absorption degree of the light absorption layer to light wave energy. Control of light polarization by the polarization device is realized by improving the whole circuit substrate; and when optical structures are integrated on a chip on a large scale, the mode screening layer can carry out polarization screening on light waves in all the optical structures, so that a large number of polarization control structures do not need to be repeatedly prepared on a light path, and the process difficulty is reduced.

The invention discloses an infrared controllable partially-polarized radiation source. The infrared controllable partially-polarized radiation source comprises a temperature controller, a blackbody, an infrared parallel light pipe, an infrared ray polaroid and a reflector. The temperature controller controls the temperature of the blackbody. The blackbody emits infrared rays with different wavelengths corresponding to different temperatures. The infrared parallel light pipe collimates the infrared rays emitted by the blackbody. The infrared ray polaroid converts the collimated infrared rays into linearly polarized radiation; according to different incident angles of the linearly polarized radiation, the reflector changes the phase difference of the linearly polarized radiation in two vibration directions which are perpendicular to each other and outputs partial polarized radiation of corresponding polarization states in a reflection manner. The infrared controllable partially-polarized radiation source is capable of generating partial infrared polarized radiation whose polarization states are different and polarization parameters are known, the partial polarized radiation can be generated in a larger polarization degree range, the polarization states of the partial polarized radiation are controllable, and the polarization degree is known, the polarization degree is stable and high in precision when the environment conditions are certain, and the infrared controllable partially-polarized radiation source is applicable to polarization scaling of an infrared polarization imaging system.

The invention provides a laser and a manufacturing method and application thereof. The laser comprises a lifting substrate, a reflecting layer, at least one platform-shaped structure, a plurality of grooves and a second material layer, wherein the lifting substrate comprises a first surface and a second surface which are opposite to each other; the reflecting layer is positioned on the second surface; the at least one platform-shaped structure is positioned on the reflecting layer, and the platform-shaped structure comprises at least two active layers and a first material layer; the pluralityof grooves are formed in the first material layer; the second material layer is located on the first material layer and fills the plurality of grooves; the refractive index of the first material layeris greater than that of the second material layer; a tunnel junction is arranged between the at least two active layers, and each active layer comprises a first semiconductor layer, an active regionand a second semiconductor layer. The laser provided by the invention can improve the current injection efficiency.

The invention relates to a quantum communication system without polarization feedback and a quantum secure direct communication method. The quantum communication system comprises a communication receiving module, a communication sending module and a quantum channel between the communication receiving module and the communication sending module. A first phase modulator in the communication receiving module can prepare photons at four phases randomly for the communication sending module, and a single-photon detector obtains a quantum bit by detecting the photons returned by the communication sending module; the communication sending module comprises a coding light path module and a security detection module. According to the invention, the consistency of the coding light path and the stability of the security detection light path are utilized, the influence of polarization drift caused by birefringence is avoided, the coding light path realizes polarization drift self-compensation, the bit error rate of quantum bits is reduced, and the communication quality is improved.