Hisao Nakashima
104Patents
11h-index
71Co-inventors
83Inventor score
Filing activity: Mar 24, 1977 → Dec 27, 2022
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US9048957B2 | Signal processing circuit, optical receiver, detector and method for compensating for waveform distortion | Electricity | 51 | Active |
| US4503540A | Phase-locked semiconductor laser device | Electricity | 40 | Expired |
| US4905060A | Light emitting device with disordered region | Electricity | 23 | Expired |
| US8249464B2 | Optical receiver and method for optical reception | Electricity | 22 | Active |
| US8301039B2 | Delay processing apparatus, signal amplification apparatus, opto-electric conversion apparatus, analog-digital conversion apparatus, receiving apparatus, and receiving method | Electricity | 20 | Active |
| US4161701A | Semiconductor laser | Electricity | 17 | Expired |
| US8526828B2 | Optical transmitter and optical transmitter unit | Electricity | 17 | Active |
| US8406635B2 | Optical communication system and optical receiver | Electricity | 16 | Active |
| US7720392B2 | Differential quadrature phase-shift modulator and method for setting driving voltage thereof | Physics | 13 | Active |
| US8391725B2 | Optical receiver for controlling wavelength of local oscillation light and local oscillation light control method | Electricity | 11 | Active |
| US8649689B2 | Digital coherent receiving apparatus | Electricity | 11 | Active |
| US8116635B2 | Polarization multiplexing and transmitting apparatus | Electricity | 10 | Active |
| US7596315B2 | Wavelength division multiplexing optical transmission system and transmission wavelength control method therefor | Electricity | 10 | Expired |
| US4426702A | Semiconductor laser device | Electricity | 10 | Expired |
| US4509173A | Phase-locked semiconductor laser device | Electricity | 10 | Expired |
| US8532503B2 | Optical receiver and optical receiving method | Electricity | 9 | Active |
| US8145069B2 | Optical transmitter | Electricity | 9 | Active |
| US7630650B2 | Multi-level modulation receiving device | Electricity | 8 | Active |
| US10122489B2 | Polarization state detector, optical transmitter, and optical receiver | Electricity | 7 | Active |
| US7061669B2 | Optical apparatus with loss compensation capability and optical amplifier for loss compensation | Electricity | 7 | Expired |
| US8078066B2 | Optical coherent receiver, frequency offset estimating apparatus and method for optical coherent receiver | Electricity | 6 | Active |
| US8103177B2 | Apparatus and method for frequency offset monitoring used in digital coherent optical receiver | Electricity | 6 | Active |
| US7602322B2 | Analog-to-digital conversion controller, optical receiving device, optical receiving method, and waveform-distortion compensating device | Electricity | 6 | Active |
| US8331793B2 | Optical transmission apparatus and method | Electricity | 5 | Active |
| US8331805B2 | Digital coherent optical receiver | Electricity | 5 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.