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| Presentation | 2018-08-23 15:20 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 (NTT)  R2018-22 EMD2018-25 CPM2018-25 OPE2018-52 LQE2018-41 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (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 µm 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) |
| (in English) | Coherence length / Constant power control / SS-OCT / Laser threshold / PI control / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 118, no. 187, CPM2018-25, pp. 25-30, Aug. 2018. | |
| Paper # | CPM2018-25 | |
| Date of Issue | 2018-08-16 (R, EMD, CPM, OPE, LQE) | |
| ISSN | Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 | |
| Copyright and reproduction |
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) | |
| Download PDF | R2018-22 EMD2018-25 CPM2018-25 OPE2018-52 LQE2018-41 |
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| Conference Information | |
| Committee | EMD LQE OPE CPM R |
| Conference Date | 2018-08-23 - 2018-08-24 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Otaru Camber of Commerce & Industry |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Paper Information | |
| Registration To | CPM |
| Conference Code | 2018-08-EMD-LQE-OPE-CPM-R |
| Language | Japanese |
| 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 |
| Keyword(6) | |
| Keyword(7) | |
| Keyword(8) | |
| 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) |
| Speaker | Author-1 |
| Date Time | 2018-08-23 15:20:00 |
| Presentation Time | 25 minutes |
| Registration for | CPM |
| Paper # | R2018-22, EMD2018-25, CPM2018-25, OPE2018-52, LQE2018-41 |
| Volume (vol) | vol.118 |
| Number (no) | no.185(R), no.186(EMD), no.187(CPM), no.188(OPE), no.189(LQE) |
| Page | pp.25-30 |
| #Pages | 6 |
| Date of Issue | 2018-08-16 (R, EMD, CPM, OPE, LQE) |
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