Yahei Koyamada: search on Z-Library

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1

Optical Nonlinearities in Coherent Optical Time Domain Reflectometry Enhanced with Optical Fiber Amplifiers

Hisashi Izumita, Yahei Koyamada, Shin-Ichi Furukawa, Izumi Sankawa

Journal:

Electronics and Communications in Japan (Part I: Communications))

Year:

1994

Language:

english

File:

PDF, 1.08 MB

english, 1994

2

[OSA Optical Fiber Communication Conference - San Jose, California (1992..-..)] Digest of Conference on Optical Fiber Communication - Coherent optical time-domain reflectometer with a 40-dB dynamic range enhanced with erbium-doped fiber amplifiers

Izumita, Hisashi, Koyamada, Yahei, Sankawa, Izumi, Furukawa, Shin-ichi

Year:

1992

Language:

english

File:

PDF, 105 KB

english, 1992

3

[IEEE SICE 2008 - 47th Annual Conference of the Society of Instrument and Control Engineers of Japan - Chofu (2008.08.20-2008.08.22)] 2008 SICE Annual Conference - Prototype double-pulse BOTDR for measuring distributed strain with 20-cm spatial resolution

Sakairi, Yoshiyuki, Satoshi Matsuura,, Adachi, Shoji, Koyamada, Yahei

Year:

2008

Language:

english

File:

PDF, 406 KB

english, 2008

4

Ultrafast walk-off-free nonlinear optical loop mirror by a simplified configuration for 320-Gbit / s time-division multiplexing signal demultiplexing

Sotobayashi, Hideyuki, Sawaguchi, Chikara, Koyamada, Yahei, Chujo, Wataru

Journal:

Year:

2002

Language:

english

File:

PDF, 77 KB

english, 2002

5

High Performance Coherent OTDR Enhanced with Erbium Doped Fiber Amplifiers

Koyamada, Yahei, Nakamoto, Hiroshi, Ohta, Norihisa

Journal:

Journal of Optical Communications

Year:

1992

Language:

english

File:

PDF, 1.53 MB

english, 1992

6

Finite-difference time-domain analysis of ultrashort laser pulse propagation in a fiber with nonlinear effects

Shinki Nakamura, Yahei Koyamada, Naoki Karasawa, Hiroyasu Sone, Ryuji Morita, Mikio Yamashita

Journal:

Electronics and Communications in Japan (Part I: Communications))

Year:

2004

Language:

english

File:

PDF, 1.42 MB

english, 2004

7

Stochastic amplitude fluctuation in coherent optimal time domain reflectometry and its reduction technique

Hisashi Izumita, Yahei Koyamada, Shin-Ichi Furukawa, Izumi Sankawa

Journal:

Electronics and Communications in Japan (Part I: Communications))

Year:

1994

Language:

english

File:

PDF, 1.05 MB

english, 1994

8

Use of signal processing techniques to improve the dynamic range of coherent OTDRs

Hiroshi Nakamoto, Norihisa Ohta, Yahei Koyamada

Journal:

Electronics and Communications in Japan (Part I: Communications))

Year:

1992

Language:

english

File:

PDF, 955 KB

english, 1992

9

SPIE Proceedings [SPIE European Symposium on Optics for Environmental and Public Safety - Munich, Germany (Monday 19 June 1995)] Distributed and Multiplexed Fiber Optic Sensors V - Advances in distributed sensing techniques using Brillouin scattering

Horiguchi, Tsuneo, Shimizu, Kaoru, Kurashima, Toshio, Koyamada, Yahei, Dakin, John P., Kersey, Alan D.

Year:

1995

Language:

english

File:

PDF, 188 KB

english, 1995

10

Frequency translation of light waves by propagation around an optical ring circuit containing a frequency shifter: II Theoretical analysis

Shimizu, Kaoru, Horiguchi, Tsuneo, Koyamada, Yahei

Journal:

Year:

1994

Language:

english

File:

PDF, 1.32 MB

english, 1994

11

SPIE Proceedings [SPIE Fibers '92 - Boston, MA (Tuesday 8 September 1992)] Distributed and Multiplexed Fiber Optic Sensors II - Measurement of temperature and strain distribution by Brillouin frequency shift in silica optical fibers

Horiguchi, Tsuneo, Kurashima, Toshio, Koyamada, Yahei, Dakin, John P., Kersey, Alan D.

Year:

1993

Language:

english

File:

PDF, 528 KB

english, 1993

12

A Tunable 1.6 μm Band Optical Time-domain Reflectometer

Sato, Toshiya, Horiguchi, Tsuneo, Koyamada, Yahei

Journal:

Journal of Optical Communications

Year:

1998

Language:

english

File:

PDF, 1.81 MB

english, 1998

13

SPIE Proceedings [SPIE Fibers '92 - Boston, MA (Tuesday 8 September 1992)] Distributed and Multiplexed Fiber Optic Sensors II - New technique to shift lightwave frequency for distributed fiber optic sensing

Shimizu, Kaoru, Kurashima, Toshio, Horiguchi, Tsuneo, Koyamada, Yahei, Dakin, John P., Kersey, Alan D.

Year:

1993

Language:

english

File:

PDF, 577 KB

english, 1993

14

Ray Tracing Analysis of Light Radiation from Sharp Bends in Graded-Index Multimode Fibers

Koyamada, Yahei, Nakano, Hayato, Furukawa, Shin-ichi

Journal:

Journal of Optical Communications

Year:

1993

Language:

english

File:

PDF, 512 KB

english, 1993

15

Coherent synthesis of two continuous microwave signals generated by two optical beats

Takeuchi, Daiki, Chujo, Wataru, Yamamoto, Shin-ichi, Koyamada, Yahei

Journal:

IEICE Electronics Express

Year:

2014

Language:

english

File:

PDF, 2.64 MB

english, 2014

16

Numerical Analysis of Induced Phase Modulation between Two Ultrashort Pulses in Silica Fiber by the Extended Finite-Difference Time-Domain Method

Shinki Nakamura, Naoya Takasawa, Takeshi Saeki, Yahei Koyamada

Journal:

Year:

2004

Language:

english

File:

PDF, 201 KB

english, 2004

17

Impedance element and band rejection filter using the same

Koyamada, Yahei

Journal:

The Journal of the Acoustical Society of America

Year:

1981

Language:

english

File:

PDF, 158 KB

english, 1981

18

Frequency translation of light waves by propagation around an optical ring circuit containing a frequency shifter: I Experiment

Shimizu, Kaoru, Horiguchi, Tsuneo, Koyamada, Yahei

Journal:

Year:

1993

Language:

english

File:

PDF, 1.29 MB

english, 1993

19

[IEEE SICE Annual Conference 2007 - Takamatsu, Japan (2007.09.17-2007.09.20)] SICE Annual Conference 2007 - Novel type brillouin optical time-domain reflectometry for measuring distributed strain and temperature with sub-meter spatial resolution in km-long fiber

Yahei Koyamada,, Yoshiyuki Sakairi,, Nobuaki Takeuchi,, Shoji Adachi,

Year:

2007

Language:

english

File:

PDF, 597 KB

english, 2007

20

[IEEE 2008 Joint Conference of the Opto-Electronics and Communications Conference (OECC) and the Australian Conference on Optical Fibre Technology (ACOFT) - Sydney, Australia (2008.07.7-2008.07.10)] OECC/ACOFT 2008 - Joint Conference of the Opto-Electronics and Communications Conference and the Australian Conference on Optical Fibre Technology - Prototype double-pulse BOTDR for measuring distributed strain with 20-cm spatial resolution

Yoshiyuki Sakairi,, Satoshi Matsuura,, Shoji Adachi,, Yahei Koyamada,

Year:

2008

Language:

english

File:

PDF, 102 KB

english, 2008

21

Observation of Slowly Varying Envelope Approximation Breakdown by Comparison between the Extended Finite-Difference Time-Domain Method and the Beam Propagation Method for Ultrashort-Laser-Pulse Propagation in a Silica Fiber

Nakamura, Shinki, Saeki, Takeshi, Koyamada, Yahei

Journal:

Japanese Journal of Applied Physics

Year:

2004

Language:

english

File:

PDF, 478 KB

english, 2004

22

Recent progress in optical fibre measurement techniques

Journal:

Optics & Laser Technology

Year:

1992

Language:

english

File:

PDF, 146 KB

english, 1992

23

Design of multimode graded-index fiber parameters in the long-wavelength region

Ohashi, Masaharu, Kitayama, Ken-ichi, Koyamada, Yahei, Uchida, Naoya, Seikai, Shigeyuki

Journal:

Year:

1984

Language:

english

File:

PDF, 563 KB

english, 1984

24

Extended Finite Difference Time Domain Analysis of Induced Phase Modulation and Four-Wave Mixing between Two-Color Femtosecond Laser Pulses in a Silica Fiber with Different Initial Delays

Nakamura, Shinki, Takasawa, Naoya, Koyamada, Yahei, Sone, Hiroyasu, Xu, Lin, Morita, Ryuji, Yamashita, Mikio

Journal:

Japanese Journal of Applied Physics

Year:

2005

Language:

english

File:

PDF, 247 KB

english, 2005

25

Measurement of distributed strain and temperature in a branched optical fiber network by use of Brillouin optical time-domain reflectometry

Shimizu, Kaoru, Horiguchi, Tsuneo, Koyamada, Yahei

Journal:

Year:

1995

Language:

english

File:

PDF, 239 KB

english, 1995

26

Non-Blocking 100 × 100 Optomechanical Matrix Switch

Katagiri, Toshiaki, Koyamada, Yahei

Journal:

Journal of Optical Communications

Year:

1993

Language:

english

File:

PDF, 870 KB

english, 1993

27

Frequency-difference stabilization of distributed-feedback laser diodes by use of an optical frequency translation circuit

Shimizu, Kaoru, Horiguchi, Tsuneo, Koyamada, Yahei

Journal:

Year:

1993

Language:

english

File:

PDF, 421 KB

english, 1993

28

Launching and receiving conditions for optical fiber loss measurements using an OTDR

Shin-Ichi Furukawa, Yahei Koyamada

Journal:

Electronics and Communications in Japan (Part II: Electronics))

Year:

1988

Language:

english

File:

PDF, 759 KB

english, 1988

29

Measurement of Distributed Strain in Frozen Cables and its Potential for Use in Predicting Cable Failure

Kurashima, Toshio, Hogari, Kazuo, Matsuhashi, Satoshi, Horiguchi, Tsuneo, Koyamada, Yahei, Wakui, Yutaka, Hirano, Hiroshi

Journal:

Journal of Optical Communications

Year:

1997

Language:

english

File:

PDF, 1.80 MB

english, 1997

30

[OSA Optical Fiber Sensors - Sapporo, Japan (1996..-..)] Optical Fiber Sensors - Coherent OFDR Using Phase Decorrelated Lightwaves for Characterizing Optical Fiber Transmission Lines

Tsuji, Kohju, Shimizu, Kaoru, Horiguchi, Tsuneo, Koyamada, Yahei

Year:

1996

Language:

english

File:

PDF, 408 KB

english, 1996

31

Absolute frequency synthesis of pulsed coherent light waves through phase-modulation active optical feedback

Shimizu, Kaoru, Horiguchi, Tsuneo, Koyamada, Yahei

Journal:

Year:

1996

Language:

english

File:

PDF, 1.11 MB

english, 1996

32

Enhancement of otdr performance with an optical fiber amplifier

Shin-Ichi Furukawa, Yahei Koyamada, Izumi Sankawa, Hisashi Izumita

Journal:

Electronics and Communications in Japan (Part I: Communications))

Year:

1992

Language:

english

File:

PDF, 751 KB

english, 1992

33

SPIE Proceedings [SPIE 10th Optical Fibre Sensors Conference - Glasgow, United Kingdom (Tuesday 11 October 1994)] Tenth International Conference on Optical Fibre Sensors - Measurement of distributed strain and temperature in a branched optical fiber network by using Brillouin optical time domain reflectometry (OTDR)

Shimizu, Kaoru, Horiguchi, Tsuneo, Koyamada, Yahei, Culshaw, Brian, Jones, Julian D. C.

Year:

1994

Language:

english

File:

PDF, 278 KB

english, 1994

34

Influence of tunneling rays to baseband frequency response of step-index plastic optical fibers

Tomonari Yoshimura, Yahei Koyamada

Journal:

Electronics and Communications in Japan (Part I: Communications))

Year:

2005

Language:

english

File:

PDF, 224 KB

english, 2005

35

Coherent self-heterodyne detection of spontaneously Brillouin-scattered light waves in a single-mode fiber

Shimizu, Kaoru, Horiguchi, Tsuneo, Koyamada, Yahei, Kurashima, Toshio

Journal:

Year:

1993

Language:

english

File:

PDF, 385 KB

english, 1993

36

Spectral-linewidth broadening in synchronous Raman fiber amplification caused by cross-phase modulation effects and its suppression

Sato, Toshiya, Horiguchi, Tsuneo, Tateda, Mitsuhiro, Koyamada, Yahei, Izumita, Hisashi

Journal:

Year:

1997

Language:

english

File:

PDF, 302 KB

english, 1997

37

Theoretical analysis of optical fiber mode exciters constructed with alternate concatenation of step-index and graded-index fibers

Yahei Koyamada, Tsuneo Horiguchi, Masamitsu Tokuda, Naoya Uchida

Journal:

Electronics and Communications in Japan (Part I: Communications))

Year:

1985

Language:

english

File:

PDF, 519 KB

english, 1985

38

Technique for translating light-wave frequency by using an optical ring circuit containing a frequency shifter

Shimizu, Kaoru, Horiguchi, Tsuneo, Koyamada, Yahei

Journal:

Year:

1992

Language:

english

File:

PDF, 455 KB

english, 1992

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