Abstract: Provided is a method for providing a strain measurement value in a sensing optical fiber. The method may include outputting light to an optical fiber, in which the optical fiber includes a standard sensing optical fiber and a sensing optical fiber extending from the standard sensing optical fiber, in which the standard sensing optical fiber is accommodated inside an external environmental protection case, providing a strain measurement value in the sensing optical fiber based on Rayleigh scattered light reflected back from points of the optical fiber, and providing a final strain measurement value by compensating for an error caused by a change in light source in the strain measurement value in the sensing optical fiber.

Abstract: Disclosed are a distributed temperature sensing system using a multicore optical fiber and a method thereof. The distributed temperature sensing system using the multicore optical fiber is configured to use the multicore optical fiber for a typical distributed temperature sensing system (DTSS), analyze a signal by collecting, for all cores, Raman-scattered light that is backscattered by multiple cores, increase the size of the signal by the number of times corresponding to the number of cores, increase a signal-to-noise ratio (SNR) for the same sensing time, and increase a sensing distance.

Abstract: The present disclosure relates to a planar optical waveguide and an optical module. A planar optical waveguide according to the present disclosure includes a core and dads provided at an upper portion and a lower portion of the core, respectively, and an end of an upper clad facing a light source is polished to form a first refractive surface inclined at a first angle to refract a light emitted to the upper portion of the core and guide the light to the core. The refractive surfaces are formed at the upper clad and the lower clad of the planar optical waveguide in consideration of beam characteristics of the light source to reduce optical coupling loss without a separate optical waveguide lens.

Abstract: An optical cable identification apparatus for identifying an optical cable by disturbing an optical fiber, existing inside an optical cable desired to be identified, from outside the optical cable. An optical unit transmits two optical signals to a single strand of optical fiber inside the optical cable, and detects a phase difference, a time difference, and light intensity between two optical signals which are reflected due to the disturbance from the outside. A single-fiber ending unit generates the time difference. A signal processing unit removes noise from the two reflected optical signals and demodulates the optical signals. A sound output unit outputs the optical signals from the signal processing unit as sounds.

Abstract: The present invention discloses a fiber Bragg grating sensor system.