H04J 14/0287
Protection in wdm systems
Official title: {Protection in WDM systems}
H04J14/0287 (Protection in wdm systems) appears on 1,142 US grants and 1,082 published applications in this corpus.
Search patents in H04J- Granted patents
- 1,142
- Published applications
- 1,082
- Assignees
- 320
- Inventors
- 2,126
- Latest grant
- 23 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 5 | 0 |
| 1993 | 2 | 0 |
| 1994 | 5 | 0 |
| 1995 | 2 | 0 |
| 1996 | 3 | 0 |
| 1997 | 9 | 0 |
| 1998 | 13 | 0 |
| 1999 | 21 | 0 |
| 2000 | 30 | 0 |
| 2001 | 38 | 16 |
| 2002 | 34 | 106 |
| 2003 | 50 | 85 |
| 2004 | 51 | 90 |
| 2005 | 58 | 80 |
| 2006 | 60 | 66 |
| 2007 | 71 | 48 |
| 2008 | 56 | 40 |
| 2009 | 59 | 45 |
| 2010 | 64 | 44 |
| 2011 | 33 | 43 |
| 2012 | 37 | 31 |
| 2013 | 36 | 34 |
| 2014 | 51 | 32 |
| 2015 | 35 | 36 |
| 2016 | 41 | 36 |
| 2017 | 40 | 33 |
| 2018 | 29 | 24 |
| 2019 | 35 | 42 |
| 2020 | 43 | 32 |
| 2021 | 25 | 31 |
| 2022 | 34 | 22 |
| 2023 | 23 | 33 |
| 2024 | 25 | 15 |
| 2025 | 14 | 9 |
| 2026 | 9 | 9 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Systems and methods for resilient switch devices23 Jun 2026US 12,665,839 B2Mellanox Technologies, Ltd.
- FlexO/ZR subrating and partial survivability21 Apr 2026US 12,609,766 B2Ciena Corporation
- Proactive path computation element to accelerate path computation7 Apr 2026US 12,597,996 B2Cisco Technology, Inc.
- Communication network optical apparatus and method of providing an optical signal17 Mar 2026US 12,580,661 B2Telefonaktiebolaget LM Ericsson (publ)
- Optical path route design device and optical path route design method17 Mar 2026US 12,581,223 B2NTT, Inc.
- Stretched single optical span communications system and method avoiding hazardous power levels24 Sep 2026US 2026/0291637 A1Ciena Corporation
- Methods and apparatus for multiplexing and demultiplexing optical signals of protected optics17 Sep 2026US 2026/0280746 A1Molex Incorporated
- Wavelength Management in Multi-Rail Optical Networks13 Aug 2026US 2026/0238373 A1Ciena Corporation
- Coordinated Layer-0 and Layer-1 Control for Right-Sizing Optical Interfaces6 Aug 2026US 2026/0230177 A1Ciena Corporation
- Connection Node Apparatus, Optical Transmission System, And Connection Method25 Jun 2026US 2026/0181289 A1NTT, Inc.
Most cited
By later US patents
- Method and system for detecting optical faults within the optical domain of a fiber communication network248US 6,005,694 AMCI WorldCom, 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
- Inter-ring cross-connect for survivable multi-wavelength optical communication networks178US 6,226,111 B1Telcordia Technologies, Inc. · 2001
- System and method for packet level distributed routing in fiber optic rings168US 6,532,088 B1Alcatel · 2003