H04B 10/556
Digital modulation
Official title: Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]
H04B10/556 (Digital modulation) appears on 645 US grants and 675 published applications in this corpus.
Search patents in H04B- Granted patents
- 645
- Published applications
- 675
- Assignees
- 214
- Inventors
- 1,096
- Latest grant
- 30 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 1 |
| 2002 | 0 | 2 |
| 2003 | 2 | 9 |
| 2004 | 6 | 5 |
| 2005 | 0 | 15 |
| 2006 | 5 | 16 |
| 2007 | 7 | 24 |
| 2008 | 16 | 19 |
| 2009 | 15 | 28 |
| 2010 | 13 | 29 |
| 2011 | 25 | 25 |
| 2012 | 27 | 31 |
| 2013 | 22 | 27 |
| 2014 | 43 | 32 |
| 2015 | 41 | 64 |
| 2016 | 44 | 49 |
| 2017 | 60 | 44 |
| 2018 | 48 | 40 |
| 2019 | 65 | 46 |
| 2020 | 50 | 37 |
| 2021 | 38 | 36 |
| 2022 | 33 | 32 |
| 2023 | 30 | 21 |
| 2024 | 25 | 19 |
| 2025 | 20 | 15 |
| 2026 | 6 | 9 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Transmitting device and method for transmitting a broadband optical transmission signal30 Jun 2026US 12,671,501 B2Rheinisch-Westfalische Technische Hochschule Aachen (Rwth) Aachen
- Systems and methods for in-phase and quadrature modulation16 Jun 2026US 12,659,044 B2Huawei Technologies Co., Ltd.
- Polarization modulator with separate optical sections14 Apr 2026US 12,601,936 B2Tesat-Spacecom GmbH & Co. KG
- Semiconductor IQ modulator24 Feb 2026US 12,560,852 B2NTT, Inc.
- Communication device including nested modulator and bias control method for nested modulator10 Feb 2026US 12,549,258 B2NEC Corporation
- Optical transmission device, optical transmission system, optical module, and optical controller1 Oct 2026US 2026/0303220 A11FINITY Inc.
- Data Processing Method and Apparatus6 Aug 2026US 2026/0230225 A1Huawei Technologies Co., Ltd.
- Optical transmission system and transmitter21 May 2026US 2026/0142730 A1Fujitsu Limited
- Optical signal generation device and optical signal generation method14 May 2026US 2026/0133462 A1NTT, Inc.
- Differential qpsk encoding and decoding23 Apr 2026US 2026/0113122 A1Attltude, Inc.
Most cited
By later US patents
- Optical transmission apparatuses, methods, and systems122US 7,826,752 B1Level 3 Communications, LLC · 2010
- Method and device for generating optical signals95US 8,831,440 B2Huawei Technologies Co., Ltd. · 2014
- Electro-optical integrated transmitter chip for arbitrary quadrature modulation of optical signals62US 7,272,271 B2CeLight, Inc. · 2007
- Digital-to-analog converter and generation of high-bandwidth analog signals57US 10,374,623 B1Ciena Corporation · 2019
- Digital radio frequency tranceiver system and method54US 8,260,143 B2Hypres, Inc. · 2012