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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Electronics and Electrical Engineering 60 1621 1551 55 51 1136 14856

Fumio Koyama publications per year

The chart shows the history of publications by Fumio Koyama between 1981 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Fumio Koyama published across 45 years, from 1981 to 2025, averaging 26.4 papers a year. Output peaked at 60 publications in 2002. 11 of the 1,190 publications appeared in the last two years.

No. of publications
20 40 60
Bar chart. Horizontal axis: year, 1981 to 2025. Vertical axis: number of publications, 0 to 60. Peak 60 publications in 2002. 1981: 3 publications 1982: 4 publications 1983: 2 publications 1984: 6 publications 1985: 5 publications 1986: 5 publications 1987: 8 publications 1988: 14 publications 1989: 11 publications 1990: 20 publications 1991: 33 publications 1992: 24 publications 1993: 21 publications 1994: 28 publications 1995: 31 publications 1996: 21 publications 1997: 30 publications 1998: 34 publications 1999: 43 publications 2000: 46 publications 2001: 47 publications 2002: 60 publications 2003: 44 publications 2004: 59 publications 2005: 41 publications 2006: 43 publications 2007: 38 publications 2008: 50 publications 2009: 34 publications 2010: 23 publications 2011: 31 publications 2012: 38 publications 2013: 37 publications 2014: 37 publications 2015: 30 publications 2016: 23 publications 2017: 30 publications 2018: 20 publications 2019: 22 publications 2020: 12 publications 2021: 46 publications 2022: 16 publications 2023: 9 publications 2024: 5 publications 2025: 6 publications
1981 2025

1,190 publications in total across all disciplines

View publications per year as a table
Fumio Koyama: publications per year, 1981 to 2025
Year Publications
1981 3
1982 4
1983 2
1984 6
1985 5
1986 5
1987 8
1988 14
1989 11
1990 20
1991 33
1992 24
1993 21
1994 28
1995 31
1996 21
1997 30
1998 34
1999 43
2000 46
2001 47
2002 60
2003 44
2004 59
2005 41
2006 43
2007 38
2008 50
2009 34
2010 23
2011 31
2012 38
2013 37
2014 37
2015 30
2016 23
2017 30
2018 20
2019 22
2020 12
2021 46
2022 16
2023 9
2024 5
2025 6
Total 1,190
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Fumio Koyama publication distribution in Electronics and Electrical Engineering in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Electronics and Electrical Engineering in 2026. The highlighted bar marks where Fumio Koyama sits on this spectrum.

No. of scientists
100 200 300 400
Bar chart with 53 bars. Horizontal axis: publications, 34–53 to 1,065+. Vertical axis: number of scientists, 0 to 445. Most scientists, 445, have 174–193 publications. The last bar groups every scientist with 1,065 publications or more. The highlighted bar, 1,065+ publications, is where this scientist sits. 34–53 publications: 24 scientists 54–73 publications: 52 scientists 74–93 publications: 114 scientists 94–113 publications: 203 scientists 114–133 publications: 269 scientists 134–153 publications: 355 scientists 154–173 publications: 403 scientists 174–193 publications: 445 scientists 194–213 publications: 430 scientists 214–233 publications: 431 scientists 234–253 publications: 399 scientists 254–273 publications: 366 scientists 274–293 publications: 335 scientists 294–313 publications: 300 scientists 314–333 publications: 276 scientists 334–353 publications: 250 scientists 354–373 publications: 214 scientists 374–393 publications: 187 scientists 394–413 publications: 152 scientists 414–433 publications: 169 scientists 434–453 publications: 147 scientists 454–473 publications: 111 scientists 474–493 publications: 117 scientists 494–513 publications: 103 scientists 514–533 publications: 99 scientists 534–553 publications: 92 scientists 554–573 publications: 75 scientists 574–593 publications: 58 scientists 594–613 publications: 69 scientists 614–633 publications: 50 scientists 634–653 publications: 62 scientists 654–673 publications: 54 scientists 674–693 publications: 44 scientists 694–713 publications: 37 scientists 714–733 publications: 28 scientists 734–753 publications: 26 scientists 754–773 publications: 26 scientists 774–793 publications: 19 scientists 794–813 publications: 23 scientists 814–833 publications: 20 scientists 834–853 publications: 16 scientists 854–873 publications: 20 scientists 874–893 publications: 11 scientists 894–913 publications: 11 scientists 914–933 publications: 16 scientists 934–953 publications: 13 scientists 954–973 publications: 10 scientists 974–993 publications: 11 scientists 994–1,013 publications: 9 scientists 1,014–1,033 publications: 9 scientists 1,034–1,053 publications: 10 scientists 1,054–1,064 publications: 6 scientists 1,065+ publications: 99 scientists
34–53 publications 1,065+

This scientist: 1,136 publications — 99th percentile

99% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,065 publications or more.

View publications distribution as a table
Number of Electronics and Electrical Engineering scientists by publication count, Research.com 2026 ranking edition. Based on 6,875 ranked scientists.
Publications Scientists This scientist
34–53 24
54–73 52
74–93 114
94–113 203
114–133 269
134–153 355
154–173 403
174–193 445
194–213 430
214–233 431
234–253 399
254–273 366
274–293 335
294–313 300
314–333 276
334–353 250
354–373 214
374–393 187
394–413 152
414–433 169
434–453 147
454–473 111
474–493 117
494–513 103
514–533 99
534–553 92
554–573 75
574–593 58
594–613 69
614–633 50
634–653 62
654–673 54
674–693 44
694–713 37
714–733 28
734–753 26
754–773 26
774–793 19
794–813 23
814–833 20
834–853 16
854–873 20
874–893 11
894–913 11
914–933 16
934–953 13
954–973 10
974–993 11
994–1,013 9
1,014–1,033 9
1,034–1,053 10
1,054–1,064 6
1,065+ 99 1,136
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Fumio Koyama D-index placement in Electronics and Electrical Engineering in 2026

The chart shows the D-index (discipline H-index) distribution of Electronics and Electrical Engineering scientists ranked by Research.com in 2026. The highlighted bar marks where Fumio Koyama sits on this spectrum.

No. of scientists
50 100 150 200 250
Bar chart with 82 bars. Horizontal axis: D-Index, 30 to 111+. Vertical axis: number of scientists, 0 to 263. Most scientists, 263, have 32 D-Index. The last bar groups every scientist with 111 D-Index or more. The highlighted bar, 60 D-Index, is where this scientist sits. 30 D-Index: 178 scientists 31 D-Index: 257 scientists 32 D-Index: 263 scientists 33 D-Index: 262 scientists 34 D-Index: 244 scientists 35 D-Index: 236 scientists 36 D-Index: 211 scientists 37 D-Index: 220 scientists 38 D-Index: 214 scientists 39 D-Index: 214 scientists 40 D-Index: 205 scientists 41 D-Index: 187 scientists 42 D-Index: 194 scientists 43 D-Index: 201 scientists 44 D-Index: 155 scientists 45 D-Index: 189 scientists 46 D-Index: 148 scientists 47 D-Index: 160 scientists 48 D-Index: 134 scientists 49 D-Index: 130 scientists 50 D-Index: 141 scientists 51 D-Index: 156 scientists 52 D-Index: 108 scientists 53 D-Index: 130 scientists 54 D-Index: 112 scientists 55 D-Index: 97 scientists 56 D-Index: 111 scientists 57 D-Index: 102 scientists 58 D-Index: 108 scientists 59 D-Index: 120 scientists 60 D-Index: 103 scientists 61 D-Index: 93 scientists 62 D-Index: 92 scientists 63 D-Index: 74 scientists 64 D-Index: 77 scientists 65 D-Index: 73 scientists 66 D-Index: 64 scientists 67 D-Index: 69 scientists 68 D-Index: 60 scientists 69 D-Index: 39 scientists 70 D-Index: 57 scientists 71 D-Index: 59 scientists 72 D-Index: 46 scientists 73 D-Index: 49 scientists 74 D-Index: 38 scientists 75 D-Index: 35 scientists 76 D-Index: 32 scientists 77 D-Index: 35 scientists 78 D-Index: 31 scientists 79 D-Index: 22 scientists 80 D-Index: 34 scientists 81 D-Index: 31 scientists 82 D-Index: 34 scientists 83 D-Index: 23 scientists 84 D-Index: 18 scientists 85 D-Index: 30 scientists 86 D-Index: 19 scientists 87 D-Index: 19 scientists 88 D-Index: 20 scientists 89 D-Index: 8 scientists 90 D-Index: 17 scientists 91 D-Index: 7 scientists 92 D-Index: 14 scientists 93 D-Index: 9 scientists 94 D-Index: 15 scientists 95 D-Index: 10 scientists 96 D-Index: 12 scientists 97 D-Index: 10 scientists 98 D-Index: 10 scientists 99 D-Index: 12 scientists 100 D-Index: 16 scientists 101 D-Index: 5 scientists 102 D-Index: 7 scientists 103 D-Index: 7 scientists 104 D-Index: 8 scientists 105 D-Index: 9 scientists 106 D-Index: 13 scientists 107 D-Index: 4 scientists 108 D-Index: 5 scientists 109 D-Index: 10 scientists 110 D-Index: 8 scientists 111+ D-Index: 96 scientists
30 D-Index 111+

This scientist: 60 D-Index — 77th percentile

77% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 111 D-Index or more.

View D-Index distribution as a table
Number of Electronics and Electrical Engineering scientists by D-index, Research.com 2026 ranking edition. Based on 6,875 ranked scientists.
D-Index Scientists This scientist
30 178
31 257
32 263
33 262
34 244
35 236
36 211
37 220
38 214
39 214
40 205
41 187
42 194
43 201
44 155
45 189
46 148
47 160
48 134
49 130
50 141
51 156
52 108
53 130
54 112
55 97
56 111
57 102
58 108
59 120
60 103 60
61 93
62 92
63 74
64 77
65 73
66 64
67 69
68 60
69 39
70 57
71 59
72 46
73 49
74 38
75 35
76 32
77 35
78 31
79 22
80 34
81 31
82 34
83 23
84 18
85 30
86 19
87 19
88 20
89 8
90 17
91 7
92 14
93 9
94 15
95 10
96 12
97 10
98 10
99 12
100 16
101 5
102 7
103 7
104 8
105 9
106 13
107 4
108 5
109 10
110 8
111+ 96
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Research.com Recognitions

  • 2020 - OSA Fellows Fumio Koyama Tokyo Institute of Technology, Japan For seminal contributions to VCSEL photonics and integration

Overview

Fumio Koyama is affiliated with the Tokyo Institute of Technology in Japan. Their primary research contributions lie within the field of Engineering, with a focus on Electrical and Electronic Engineering. The scientist's work spans several subfields including Atomic and Molecular Physics, and Optics, Surfaces, Coatings and Films, Instrumentation, and Biomedical Engineering.

Their research covers multiple topics predominantly related to photonics and semiconductor technology. Major areas of focus include Photonic and Optical Devices, Semiconductor Lasers and Optical Devices, Optical Network Technologies, Semiconductor Quantum Structures and Devices, Optical Coatings and Gratings, Advanced Optical Sensing Technologies, and Optical Coherence Tomography Applications.

Recent publications by Fumio Koyama include:

  • Directly modulated membrane lasers with 108 GHz bandwidth on a high-thermal-conductivity silicon carbide substrate, 2020, Nature Photonics
  • >100-GHz Bandwidth Directly-Modulated Lasers and Adaptive Entropy Loading for Energy-Efficient >300-Gbps/λ IM/DD Systems, 2020, Journal of Lightwave Technology
  • 1060-nm single-mode transverse coupled cavity VCSEL with intra-cavity surface relief for 58-Gbps modulation and 5-km single-mode fiber transmission, 2022, Applied Physics Letters
  • High-power operations of single-mode surface grating long oxide aperture VCSELs, 2021, Applied Physics Letters
  • High power surface grating slow-light VCSEL, 2021, Applied Physics Express

Frequent co-authors associated with Fumio Koyama's work include Xiaodong Gu, Shanting Hu, Ahmed M. Hassan, Masanori Nakahama, and Satoshi Shinada.

The scientist has published extensively in several venues, with notable frequent publication venues being the Conference on Lasers and Electro-Optics, Applied Physics Express, IEICE Electronics Express, Journal of Lightwave Technology, and Japanese Journal of Applied Physics.

Among the recognitions received, Fumio Koyama was named an OSA Fellow in 2020 with the citation highlighting seminal contributions to VCSEL photonics and integration.

Best Publications

  • Surface emitting semiconductor lasers

    K. Iga;F. Koyama;S. Kinoshita

  • Frequency chirping in external modulators

    F. Koyama;K. Iga

  • Recent Advances of VCSEL Photonics

    F. Koyama

  • Room-temperature continuous wave lasing characteristics of a GaAs vertical cavity surface-emitting laser

    Fumio Koyama;Susumu Kinoshita;Kenichi Iga

  • Spontaneous emission factor of a microcavity DBR surface-emitting laser

    T. Baba;T. Hamano;F. Koyama;K. Iga

  • Electron reflectance of multiquantum barrier (MQB)

    K. Iga;H. Uenohara;F. Koyama

  • Record low-threshold index-guided InGaAs/GaAlAs vertical-cavity surface-emitting laser with a native oxide confinement structure

    Y. Hayashi;T. Mukaihara;N. Hatori;N. Ohnoki

  • 1.5 μm phase-shifted DFB lasers for single-mode operation

    K. Sekartedjo;N. Eda;K. Furuya;Y. Suematsu

  • Directly modulated membrane lasers with 108 GHz bandwidth on a high-thermal-conductivity silicon carbide substrate

    Suguru Yamaoka;Nikolaos Panteleimon Diamantopoulos;Hidetaka Nishi;Ryo Nakao

  • Microcavity GalaAs/GaAs surface-emitting laser with Ith = 6 mA

    K. Iga;S. Kinoshita;F. Koyama

  • 1.5-1.6 µm GaInAsP/InP dynamic-single-mode (DSM) lasers with distributed Bragg reflector

    F. Koyama;Y. Suematsu;S. Arai;T. Tawee

  • 29 GHz directly modulated 980 nm vertical-cavity surface emitting lasers with bow-tie shape transverse coupled cavity

    Hamed Dalir;Fumio Koyama

  • Room temperature cw operation of GaAs vertical cavity surface emitting laser

    Fumio Koyama;Susumu Kinoshita;Kenichi Iga

  • Near room temperature continuous wave lasing characteristics of GaInAsP/InP surface emitting laser

    T. Baba;Y. Yogo;K. Suzuki;F. Koyama

  • Analysis of dynamic spectral width of dynamic-single-mode (DSM) lasers and related transmission bandwidth of single-mode fibers

    F. Koyama;Y. Suematsu

  • Image display device and image display method

    Tatsuhiko Nobori;Fumio Koyama

  • Polarization control of vertical-cavity surface emitting lasers using a birefringent metal/dielectric polarizer loaded on top distributed Bragg reflector

    T. Mukaihara;N. Ohnoki;Y. Hayashi;N. Hatori

  • Thermal Annealing of GaInNAs/GaAs Quantum Wells Grown by Chemical Beam Epitaxy and Its Effect on Photoluminescence

    Takeo Kageyama;Tomoyuki Miyamoto;Shigeki Makino;Fumio Koyama

  • A Novel Short-Cavity Laser with Deep-Grating Distributed Bragg Reflectors

    Toshihiko Baba;Motoshi Hamasaki;Nobuaki Watanabe;Pasu Kaewplung Akihiro Matsutani

  • Growth of highly strained GaInAs/GaAs quantum wells for 1.2 μm wavelength lasers

    D Schlenker;T Miyamoto;Z Chen;F Koyama

  • Recent advances in VCSEL photonics

    Fumio Koyama

Frequent Co-Authors

Kenichi Iga
Kenichi Iga Tokyo Institute of Technology
Hamed Dalir
Hamed Dalir University of Florida
Toshihiko Baba
Toshihiko Baba Yokohama National University
Yasuharu Suematsu
Yasuharu Suematsu Tokyo Institute of Technology
Connie J. Chang-Hasnain
Connie J. Chang-Hasnain University of California, Berkeley
Shigehisa Arai
Shigehisa Arai Tokyo Institute of Technology
C. Caneau
C. Caneau Corning (United States)
Andrei Faraon
Andrei Faraon California Institute of Technology
Alan E. Willner
Alan E. Willner University of Southern California
Masashi Yoshimura
Masashi Yoshimura Osaka University

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