H04J 14/0201
Add-and-drop multiplexing
Official title: {Add-and-drop multiplexing}
H04J14/0201 (Add-and-drop multiplexing) appears on 2,512 US grants and 2,503 published applications in this corpus.
Search patents in H04J- Granted patents
- 2,512
- Published applications
- 2,503
- Assignees
- 605
- Inventors
- 3,656
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 5 | 0 |
| 1995 | 6 | 0 |
| 1996 | 10 | 0 |
| 1997 | 19 | 0 |
| 1998 | 30 | 0 |
| 1999 | 37 | 0 |
| 2000 | 51 | 0 |
| 2001 | 79 | 37 |
| 2002 | 69 | 183 |
| 2003 | 115 | 116 |
| 2004 | 81 | 139 |
| 2005 | 83 | 89 |
| 2006 | 107 | 82 |
| 2007 | 104 | 74 |
| 2008 | 66 | 72 |
| 2009 | 59 | 66 |
| 2010 | 86 | 84 |
| 2011 | 53 | 91 |
| 2012 | 83 | 122 |
| 2013 | 88 | 102 |
| 2014 | 122 | 82 |
| 2015 | 109 | 96 |
| 2016 | 91 | 119 |
| 2017 | 131 | 101 |
| 2018 | 104 | 114 |
| 2019 | 137 | 114 |
| 2020 | 115 | 114 |
| 2021 | 105 | 96 |
| 2022 | 96 | 90 |
| 2023 | 74 | 102 |
| 2024 | 71 | 82 |
| 2025 | 63 | 78 |
| 2026 | 54 | 58 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Optical fiber input/output tray with wavelength division multiplexing support for a co-packaged optical switch6 Oct 2026US 12,756,492 B2Quanta Computer Inc.
- Optical fiber test method, ROADM system, server and storage medium29 Sep 2026US 12,750,152 B2Zte Corporation
- Broadband polarization-entangled system for C+L-band flex-grid quantum networks15 Sep 2026US 12,739,047 B2UT-Battelle, LLC
- Multi-rail routing and spectrum assignment15 Sep 2026US 12,739,539 B2Ciena Corporation
- Control apparatus, communication system, control method and program8 Sep 2026US 12,732,299 B2NTT, Inc.
- Parallelized Optical Link Calibration Over an Optical Section8 Oct 2026US 2026/0312714 A1Ciena Corporation
- Optical multi-wavelength dual-polarization transceivers1 Oct 2026US 2026/0303248 A1Aloe Semiconductor Inc.
- Silicon backplanes for a liquid crystal on silicon (lcos) phase modulator1 Oct 2026US 2026/0304011 A1Molex Incorporated
- Optical assembly, chip, active antenna unit, baseband unit, base station, and communication system24 Sep 2026US 2026/0291614 A1Huawei Technologies Co., Ltd.
- Optical add drop multiplexers with asymmetrical filtering17 Sep 2026US 2026/0280744 A1Equinix, Inc.
Most cited
By later US patents
- High reflection isolation optical devices and the method for making the same357US 7,289,733 B1Alliance Fiber Optic Products, Inc. · 2007
- Wavelength-selective optical add/drop using tilting micro-mirrors256US 5,960,133 ATellium, Inc. · 1999
- Method and apparatus for multiplexing in a wireless communication infrastructure211US 6,826,163 B2NEXTG Networks · 2004
- Method and apparatus for multiplexing in a wireless communication infrastructure201US 6,826,164 B2NEXTG Networks · 2004
- Method of activating optical communication system, channel increasing/decreasing method, and computer-readable recording medium165US 6,839,160 B2Fujitsu Limited · 2005