H04J 14/083
Add and drop multiplexing
Official title: {Add and drop multiplexing}
H04J14/083 (Add and drop multiplexing) appears on 40 US grants and 26 published applications in this corpus.
Search patents in H04J- Granted patents
- 40
- Published applications
- 26
- Assignees
- 24
- Inventors
- 86
- Latest grant
- 2 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 4 | 0 |
| 1999 | 2 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 9 |
| 2003 | 2 | 1 |
| 2004 | 1 | 2 |
| 2005 | 2 | 0 |
| 2006 | 3 | 1 |
| 2007 | 2 | 1 |
| 2008 | 0 | 0 |
| 2009 | 1 | 3 |
| 2010 | 2 | 1 |
| 2011 | 2 | 0 |
| 2012 | 0 | 0 |
| 2013 | 1 | 0 |
| 2014 | 0 | 1 |
| 2015 | 1 | 1 |
| 2016 | 1 | 1 |
| 2017 | 2 | 2 |
| 2018 | 2 | 0 |
| 2019 | 0 | 0 |
| 2020 | 2 | 1 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 1 | 0 |
| 2024 | 0 | 0 |
| 2025 | 1 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Apparatus for optical demultiplexing2 Dec 2025US 12,489,542 B2Innolume GmbH
- Optical demultiplexer, optical separation device, optical transmission system, and optical transmission method16 May 2023US 11,652,563 B2Nippon Telegraph and Telephone Corporation
- Fiber input power selection for probabilistically shaped signals in optical networks30 Jun 2020US 10,700,807 B1Fujitsu Limited
- Service synchronization in retain home path scenarios in a control plane network14 Jan 2020US 10,536,216 B1Ciena Corporation
- Low cost gain clamped EDFA for TWDM passive optical network application17 Apr 2018US 9,948,422 B2Google Inc.
- Apparatus for optical demultiplexing10 Apr 2025US 2025/0119228 A1Innolume GmbH
- Optical demultiplexer, optical separation device, optical transmission system, and optical transmission method10 Nov 2022US 2022/0360355 A1Nippon Telegraph and Telephone Corporation
- Service synchronization in Retain Home Path scenarios in a control plane network30 Jan 2020US 2020/0036439 A1Ciena Corporation
- System and method for virtual network topologies and vpn in multi-layer networks20 Jul 2017US 2017/0208377 A1Infinera Corporation
- Low Cost Gain Clamped EDFA for TWDM Passive Optical Network Application1 Jun 2017US 2017/0155461 A1Google Inc.
Most cited
By later US patents
- Wavelength division optical signalling network apparatus and method86US 5,600,466 ABritish Telecommunications Public Ltd.Co. · 1997
- WDM network with control wavelength86US 5,864,414 ABritish Telecommunications Public Ltd.Co. · 1999
- Adjustable optical delay line34US 5,703,708 ASiemens Aktiengesellschaft · 1997
- Optical TDMA ring network with a central transmitting and receiving device27US 5,786,913 AAlcatel · 1998
- Optical bus communication system utilizing frame format signals23US 4,850,047 AFujitsu Limited · 1989