| Presentation | 2018-08-23 Coherence Length Extension Effect of Swept Light Source by Constant Output Power Control Masahiro Ueno, Mingchen Chen, Seiji Toyoda, Takashi Sakamoto, Yuichi Akage, Joji Yamaguchi, Tadashi Sakamoto, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Swept source optical coherence tomography (SS-OCT) is a technique to capture tomographic images of moving objects at high speed with high resolution of several 10 ?m level. Since coherence length of a light source used in the SS-OCT is proportional to the observable depth, it is desirable that the coherence length is long. However, since the wavelength shifts before gain of a gain medium , which is a semiconductor optical amplifier (SOA), used in the light source is saturated due to laser oscillation while the light source changes in wavelength, it is difficult to obtain the effect of narrowing the oscillation linewidth due to gain saturation. In order to the problem, by maintaining the laser threshold at all wavelengths during the wavelength sweep, it is assumed that the wavelength band where the gain exceed the loss can be narrowed even if the gain saturation does not occur. And as a method of maintain the laser threshold, we attempted a method for controlling the laser output power constant to control the output power to around the threshold power. As a result, it was confirmed that the coherence length increase as the laser output power became smaller, and it was also confirmed that the coherence length was extended as compare with the case without power control. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Coherence length / Constant power control / SS-OCT / Laser threshold / PI control |
| Paper # | R2018-22,EMD2018-25,CPM2018-25,OPE2018-52,LQE2018-41 |
| Date of Issue | 2018-08-16 (R, EMD, CPM, OPE, LQE) |
| Conference Information | |
| Committee | EMD / LQE / OPE / CPM / R |
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| Conference Date | 2018/8/23(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Otaru Camber of Commerce & Industry |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | Shinichi Wada(TMC System) / Kiichi Hamamoto(Kyusyu Univ.) / Kouki Sato(Furukawa Electric Industries) / Fumihiko Hirose(Yamagata Univ.) / Tetsushi Yuge(National Defense Academy) |
| Vice Chair | Yoshiki Kayano(Univ. of Electro-Comm.) / Hiroshi Aruga(Mitsubishi Electric) / Hiroshi Takahashi(Sophia Univ.) / Mayumi Takeyama(Kitami Inst. of Tech.) / Akira Asato(Fujitsu) |
| Secretary | Yoshiki Kayano(Muroran Inst. of Tech.) / Hiroshi Aruga(Fuji Electric) / Hiroshi Takahashi(SEI) / Mayumi Takeyama(Furukawa Electric Industries) / Akira Asato(Univ. of Tokyo) |
| Assistant | Yuichi Hayashi(ＮＡＩＳＴ) / Masaya Nagai(Osaka Univ.) / Yuya Shoji(Tokyo Inst. of Tech.) / Kazunori Seno(NTT) / Yasuo Kimura(Tokyo Univ. of Tech.) / Hideki Nakazawa(Hirosaki Univ.) / Tomoaki Terasako(Ehime Univ.) / Shinji Inoue(Kansai Univ.) / Hiroyuki Okamura(Hiroshima Univ.) |
| Paper Information | |
| Registration To | Technical Committee on Electromechanical Devices / Technical Committee on Lasers and Quantum Electronics / Technical Committee on OptoElectronics / Technical Committee on Component Parts and Materials / Technical Committee on Reliability |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Coherence Length Extension Effect of Swept Light Source by Constant Output Power Control |
| Sub Title (in English) | |
| Keyword(1) | Coherence length |
| Keyword(2) | Constant power control |
| Keyword(3) | SS-OCT |
| Keyword(4) | Laser threshold |
| Keyword(5) | PI control |
| 1st Author's Name | Masahiro Ueno |
| 1st Author's Affiliation | Nippon Telgraph and Telephone Corporation(NTT) |
| 2nd Author's Name | Mingchen Chen |
| 2nd Author's Affiliation | Nippon Telgraph and Telephone Corporation(NTT) |
| 3rd Author's Name | Seiji Toyoda |
| 3rd Author's Affiliation | Nippon Telgraph and Telephone Corporation(NTT) |
| 4th Author's Name | Takashi Sakamoto |
| 4th Author's Affiliation | Nippon Telgraph and Telephone Corporation(NTT) |
| 5th Author's Name | Yuichi Akage |
| 5th Author's Affiliation | Nippon Telgraph and Telephone Corporation(NTT) |
| 6th Author's Name | Joji Yamaguchi |
| 6th Author's Affiliation | Nippon Telgraph and Telephone Corporation(NTT) |
| 7th Author's Name | Tadashi Sakamoto |
| 7th Author's Affiliation | Nippon Telgraph and Telephone Corporation(NTT) |
| Date | 2018-08-23 |
| Paper # | R2018-22,EMD2018-25,CPM2018-25,OPE2018-52,LQE2018-41 |
| Volume (vol) | vol.118 |
| Number (no) | R-185,EMD-186,CPM-187,OPE-188,LQE-189 |
| Page | pp.pp.25-30(R), pp.25-30(EMD), pp.25-30(CPM), pp.25-30(OPE), pp.25-30(LQE), |
| #Pages | 6 |
| Date of Issue | 2018-08-16 (R, EMD, CPM, OPE, LQE) |