H04B 10/291
In which processing or amplification is carried out without conversion of the
Official title: in which processing or amplification is carried out without conversion of the main signal from optical form
H04B10/291 (In which processing or amplification is carried out without conversion of the) appears on 2,714 US grants and 2,167 published applications in this corpus.
Search patents in H04B- Granted patents
- 2,714
- Published applications
- 2,167
- Assignees
- 563
- Inventors
- 3,554
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 3 | 0 |
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 3 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 2 | 0 |
| 1986 | 3 | 0 |
| 1987 | 2 | 0 |
| 1988 | 4 | 0 |
| 1989 | 8 | 0 |
| 1990 | 13 | 0 |
| 1991 | 12 | 0 |
| 1992 | 15 | 0 |
| 1993 | 28 | 0 |
| 1994 | 39 | 0 |
| 1995 | 44 | 0 |
| 1996 | 52 | 0 |
| 1997 | 42 | 0 |
| 1998 | 70 | 0 |
| 1999 | 74 | 0 |
| 2000 | 113 | 0 |
| 2001 | 119 | 49 |
| 2002 | 174 | 217 |
| 2003 | 186 | 182 |
| 2004 | 153 | 216 |
| 2005 | 135 | 166 |
| 2006 | 185 | 108 |
| 2007 | 124 | 117 |
| 2008 | 98 | 71 |
| 2009 | 83 | 63 |
| 2010 | 70 | 66 |
| 2011 | 59 | 59 |
| 2012 | 57 | 58 |
| 2013 | 51 | 35 |
| 2014 | 60 | 40 |
| 2015 | 60 | 43 |
| 2016 | 47 | 41 |
| 2017 | 49 | 40 |
| 2018 | 40 | 50 |
| 2019 | 50 | 50 |
| 2020 | 41 | 61 |
| 2021 | 60 | 55 |
| 2022 | 54 | 88 |
| 2023 | 62 | 87 |
| 2024 | 52 | 78 |
| 2025 | 53 | 69 |
| 2026 | 56 | 58 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Multi-band coexistence element8 Sep 2026US 12,732,276 B2Verizon Patent and Licensing Inc.
- Optical network unit testing in a multi-wavelength passive optical network system8 Sep 2026US 12,732,298 B2Verizon Patent and Licensing Inc.
- Technique to reduce signal crosstalk between cores in a multi-core optical fiber transmission8 Sep 2026US 12,732,300 B2NTT, Inc.
- Optical relay device and signal transmission system1 Sep 2026US 12,726,274 B2Boe Technology Group Co., Ltd.
- Service optical signal transmission method, network device, and optical network1 Sep 2026US 12,726,293 B2Huawei Technologies Co., Ltd.
- Optical relay apparatus, optical transmission system, and optical relay method8 Oct 2026US 2026/0312687 A1NEC Corporation
- Optical transmission device and optical transmission method1 Oct 2026US 2026/0303209 A1NTT, Inc.
- Control method for multiband optical transmission system, communication device, and storage medium1 Oct 2026US 2026/0303216 A1Zte Corporation
- Signal flatness adjustment method, electronic device and computer-readable medium24 Sep 2026US 2026/0291610 A1Zte Corporation
- Optical transmission device and optical transmission method3 Sep 2026US 2026/0261340 A1NTT, Inc.
Most cited
By later US patents
- High power fiber gain media system achieved through power scaling via multiplexing216US 6,212,310 B1SDL, Inc. · 2001
- Optical communication systems using raman repeaters and components therefor167US 4,616,898 APolaroid Corporation · 1986
- Method of activating optical communication system, channel increasing/decreasing method, and computer-readable recording medium165US 6,839,160 B2Fujitsu Limited · 2005
- High-energy eye-safe pulsed fiber amplifiers and sources operating in erbium's L-band146US 7,872,794 B1Lockheed Martin Corporation · 2011
- Method of determining optical amplifier failures137US 6,064,501 ANortel Networks Limited · 2000