• Title/Summary/Keyword: photonics

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Method for Locating Arc-events by Utilizing Transmission Loss of Plastic Optical Fiber (플라스틱 광섬유의 손실 특성을 활용한 아크플래시 위치추적 방법)

  • Jeong, Hoonil;Kim, Young Ho;Kim, Youngwoong;Rho, Byung Sup;Kim, Myoung Jin
    • Journal of Sensor Science and Technology
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    • v.25 no.4
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    • pp.280-284
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    • 2016

  • For an arc-flash protection system, the selection of arc-flash sensor in implementation is largely dependent on the coverage area and the spatial resolution. Typically, a point sensor is used to accurately measure an arc event within a very narrow region; whereas, a loop or a line sensor can cover several electrical compartment at the same time, but with a poor resolution. In this work, a novel scheme for an arc-flash sensor was developed by making use of the transmission loss of plastic optical fibers (POFs) to cover a broad range with a high spatial resolution. By relating the amplitude ratio of the arc-signals at the ends of the POF with the arc-location, arc events could be located with a resolution of ~5 cm within a spatial range of 10 m, which has not been reported yet.

  • https://doi.org/10.5369/JSST.2016.25.4.280 인용 PDF KSCI

Arc-Flash Detection Sensor Based on Surface Coupling of Plastic Optical Fiber (플라스틱 광섬유 표면 입사 현상을 이용한 아크플래시 검출 광센서)

  • Jeong, Hoonil;Kim, Myoung Jin;Kim, Young Ho;Kim, Youngwoong;Rho, Byung Sup
    • Journal of Sensor Science and Technology
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    • v.25 no.3
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    • pp.208-212
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    • 2016

  • In this work, a loop sensor for Arc-Flash detections has been developed in order to trip a circuit breaker within 2.5 ms after an Arc-Flash event. For an efficient capturing of the flash light, plastic optical fibers, where light attenuations are larger than those in silica-based ones, with different diameters and surface conditions were utilized. The performance was comparatively analyzed with those of a point sensor and a commercialized product. The point sensor module was designed for hemisphere-like capturings of Arc-Flashes larger than 3 kA at 2 meters from the sensor. On the other hand, the loop sensor allowed 360-degree-detections around the fiber axis and the measurement range was dependent on the length of the fiber connected to the sensor module. The trip-level-dependent brightness measurement results showed that the fabricated point sensor and loop sensor satisfied a brightness condition, 10~40 klux, and the responses of the system to Arc-Flashes were completed within 2.5 ms.

  • https://doi.org/10.5369/JSST.2016.25.3.208 인용 PDF KSCI

A Cost-competitive Optical Receiver Engine Based on Embedded Optics Technology for 400G PAM4 Optical Transceivers in Data Center Applications

  • Lee, Eun-Gu;Lee, Jyung Chan;Kang, Chang Hyun;Jeon, Kyeongwan;Choi, Jun-Seok;Lee, Hyun Soo;Park, Jong Woon;Moon, Jong Ha
    • Current Optics and Photonics
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    • v.5 no.2
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    • pp.121-128
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    • 2021

  • We propose a novel, tiny optical receiver engine utilizing an all-in-one package based on embedded optics technology. The package's best transmission S21 and reflection S22 opto-electric (OE) bandwidths are 49.8 GHz and 34.9 GHz, respectively, and the reflectance of the optical engine is below -31.7 dB for all channels. The engine satisfies the MIL-STD-883G standard for reliability tests, such as mechanical and thermal shock, and vibration resistance. The sensitivity after 10 km single-mode fiber (SMF) transmission is below -8 dBm. The optical receiver engine is cost-competitive and applicable for 400G coarse wavelength division multiplexing 4 (CWDM4) 10 km optical transceivers.

  • https://doi.org/10.3807/COPP.2021.5.2.121 인용 PDF KSCI