This map shows the geographic impact of Masafumi Koga's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Masafumi Koga with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Masafumi Koga more than expected).
This network shows the impact of papers produced by Masafumi Koga. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Masafumi Koga. The network helps show where Masafumi Koga may publish in the future.
Co-authorship network of co-authors of Masafumi Koga
This figure shows the co-authorship network connecting the top 25 collaborators of Masafumi Koga.
A scholar is included among the top collaborators of Masafumi Koga based on the total number of
citations received by their joint publications. Widths of edges
represent the number of papers authors have co-authored together.
Node borders
signify the number of papers an author published with Masafumi Koga. Masafumi Koga is excluded from
the visualization to improve readability, since they are connected to all nodes in the network.
Koga, Masafumi, et al.. (2014). Q-value improvement by electrical maximum ratio combining in optical diversity transmission through multi-core fiber. Australian Conference on Optical Fibre Technology. 697–698.2 indexed citations
5.
Takada, Atsushi, et al.. (2014). Optical phase locking between pump and multiple-carrier signal lights in frequency-nondegenerate parametric phase-sensitive amplifier. Australian Conference on Optical Fibre Technology. 823–824.
6.
Furuta, Takayuki, et al.. (2011). Simply and cost-effectively configured radio on fiber link demonstration for 1-GHz frequency band to enhance intercept point. 393–394.
7.
Yamazaki, Etsushi, et al.. (2006). Waveband path virtual concatenation with contention resolution provided by transparent waveband conversion using QPM-LN waveguides. IEICE Technical Report; IEICE Tech. Rep.. 106(69). 55–60.1 indexed citations
Noguchi, Kazuhiro & Masafumi Koga. (2003). Reliability and Lifetime Estimation for Large-Scale Photonic Cross-Connect Switches of Photonic Networks. IEICE Transactions on Communications. 86(5). 1530–1538.3 indexed citations
10.
Koga, Masafumi, et al.. (2003). Fast Restoration on Network Control Plane Established through Photonic MPLS Routers. IEICE Transactions on Communications. 86(5). 1522–1529.2 indexed citations
11.
Sahara, A., et al.. (2002). Demonstration of Fast Restoration for Distributed Control Plane on Photonic Network. European Conference on Optical Communication. 3. 1–2.2 indexed citations
Suzuki, H., et al.. (1999). 32×10 Gb/s distributed Raman amplification transmission with 50-GHz channel spacing in the zero-dispersion region over 640 km of 1.55-µm dispersion-shifted fiber. 10(6). 45.17 indexed citations
14.
Nagatsu, Naohide, Satoru Okamoto, Masafumi Koga, & Ken-ichi Sato. (1999). Flexible OADM Architecture and Its Impact on WDM Ring Evolution for Robust and Large-Scale Optical Transport Networks. IEICE Transactions on Communications. 82(8). 1105–1114.1 indexed citations
Koga, Masafumi, et al.. (1996). Optical path cross-connect demonstrator designed to achieve 320 Gbit/s. European Conference on Optical Communication. 5. 29–32.12 indexed citations
17.
Okamoto, Satoru, et al.. (1996). Packaging of 8/spl times/16 delivery and coupling switch for a 320 Gb/s throughput optical path cross-connect system. European Conference on Optical Communication. 4. 111–114.9 indexed citations
18.
Aisawa, S., Kazuhiro Noguchi, Masafumi Koga, Takao Matsumoto, & Yoshihito Amemiya. (1994). Very-High-Speed Analog Neural Network LSI Using Super Self-Aligned Si Bipolar Process Technology. IEICE Transactions on Electronics. 77(6). 1005–1008.2 indexed citations
19.
Koga, Masafumi, et al.. (1993). Hardware Implementation of the Multifrequency Oscillation Learning Method for Analog Neural Networks. IEICE Transactions on Information and Systems. 76(6). 717–719.3 indexed citations
20.
Koga, Masafumi, et al.. (1989). Multiwavelength bidirectional repeater system using a semiconductor laser amplifier. Conference on Lasers and Electro-Optics.3 indexed citations
Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive
bibliographic database. While OpenAlex provides broad and valuable coverage of the global
research landscape, it—like all bibliographic datasets—has inherent limitations. These include
incomplete records, variations in author disambiguation, differences in journal indexing, and
delays in data updates. As a result, some metrics and network relationships displayed in
Rankless may not fully capture the entirety of a scholar's output or impact.