Please select the most similar patent number from A, B, C and D. Which number is?
A high-resolution temperature sensor based on a built-in liquid capsule (2) and a spectrum valley point. The high-resolution temperature sensor is composed of the built-in liquid capsule (2), a metal block (3), a vertical waveguide (4), a horizontal waveguide (5), two metal films (1, 6) and horizontal signal light (200). Broadband light or frequency sweeping light is adopted by the signal light (200). The liquid capsule (2) is connected with the vertical waveguide (4). The metal block (3) is arranged in the vertical waveguide (4) and is movable. The vertical waveguide (4) is connected with the horizontal waveguide (5). The temperature sensor has a compact structure and a small volume, and it is convenient for integration . And the sensitivity of the temperature sensor can reach -274nm/℃.
A: A liquid crystal-based chip filter, comprising: a chip substrate layer, the chip substrate layer being a liquid crystal layer that is distributed with liquid crystal molecules; a chip conductive core layer, which is disposed on a surface of the chip substrate layer, the chip conductive core layer being a liquid crystal layer that is distributed with liquid crystal molecules, and the chip conductive core layer comprising: a double-straight waveguide part (1) and a resonant cavity part (2) which is transmittingly coupled to the double-straight waveguide part (1), the double-straight waveguide part being used for achieving the input of white light or a multispectral light source and the output of any wavelength light; and driving electrodes (3), which are used for driving the arrangement of the liquid crystal molecules within the chip substrate layer, double-straight waveguide part (1) and resonant cavity part (2) to change, changing the refractive index of corresponding parts thereof. A tunable filtering function is achieved by using liquid crystal modulation, and the main working band under low-voltage drive can cover a near-ultraviolet to a near-infrared band and a main communication band; in addition, the volume is small and the filter is easily integrated.
B: A planar optical waveguide device (3) and a temperature measurement system. The system comprises a detection light source (1), a photoelectric detector (2), a planar optical waveguide device (3), and a measurement optical fiber (4). The planar optical waveguide device (3) comprises a substrate (5). The substrate (5) is internally provided with N temperature detection channels (31). Each of the temperature detection channels (31) comprises an incident light path (311), a reflected light path (312), and an emergent light path (313). In the N temperature measurement channels (31) arranged in parallel, a point of intersection is provided between the incident light path (311) of one temperature measurement channel (31) and the reflected light path (312) of at least one of the other temperature measurement channels (31). The detection light source (1) is in communication with the incident light path (311). The photoelectric detector (2) is in communication with the reflected light path (312). The measurement optical fiber (4) is in communication with the emergent light path (313). A FBG sensor is provided within the measurement optical fiber (4). During a multi-channel temperature measurement, the point of intersection is provided between an incident light path (311) of one temperature measurement channel (31) and the reflected light path (312) of at least one of the other temperature measurement channels (31) in the N temperature measurement channels (31) arranged in parallel so as to achieve transmission, measurement, and demodulation of optical signals.
C: A full-polarization-state integer ratio power distributor with a photonic crystal waveguide, comprising: a photonic crystal waveguide formed in a photonic crystal with a complete band-gap, wherein the photonic crystal consists of an array of background dielectric cylinders (6); the photonic crystal waveguide consists of a transverse waveguide(1,3) and a perpendicular waveguide (2) perpendicularly connected to the transverse waveguide(1,3); one end (1) of the transverse waveguide is an input end, and the other end (3) thereof is an output end; the perpendicular waveguide (2) is another output end; and the middle of the transverse waveguide (1,3) is provided with waveguide flaw dielectric cylinders (5). The full-polarization-state integer ratio power distributor is small in structural volume and high in light transmission efficiency, easy to integrate and highly efficient, suitable for large-scale optical path integration, and can realize a full-polarization-state integer ratio power distribution function.
D: An optical switch on the basis of MIM high-sensitivity SPP, consisting of: a rectangular chamber (1), a control light absorption chamber (2), a silver block (3), a vertical waveguide (4), a horizontal waveguide (5), three metal films (7), a terahertz control light (100), and a horizontally propagating signal light (200); the rectangular chamber (1) is located at an input terminal of the control light; the control light absorption chamber (2) is connected to the vertical waveguide (4); the silver block (3) is disposed within the vertical waveguide (4) and can be moved; the vertical waveguide (4) and the horizontal waveguide (5) are connected; the terahertz control light (100) is located at an upper end of the rectangular chamber (1); said MIM is a waveguide having a metal-insulator-metal structure. The optical switch is compact in structure, small in size, highly sensitive and easily integrated; the optical switch provides turn-on and turn-off functions, wherein a light extinction ratio thereof may be up to 10dB.
Answer: B