Optical Transmission System, Optical Transmission Method, Transmitter, and Receiver
US-2024380491-A1 · Nov 14, 2024 · US
Pre-distortion techniques for optical modulators to improve constellation point separation
US8948609B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8948609-B2 |
| Application number | US-201213404471-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 24, 2012 |
| Priority date | Feb 24, 2012 |
| Publication date | Feb 3, 2015 |
| Grant date | Feb 3, 2015 |
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Abstract
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According to a first aspect, techniques are provided to optimize a Mach-Zehnder modulator drive waveform by distorting the outer modulation levels of the waveform, thereby equalizing eye openings of the received optical field, and in particular creating a wider and more defined central eye opening of the received optical field. According to a second aspect, techniques are provided to adjust in-phase (I) modulation levels based on the imperfect performance of a Mach-Zehnder modulator allocated to modulate quadrature-phase (Q) modulation levels, and conversely to adjust the Q modulation levels based on the imperfect performance of an MZ modulator allocated to modulate I modulation levels.
First claim
Opening claim text (preview).
What is claimed is: 1. A method comprising: receiving as input, data to be transmitted from a transmitter to a receiver over an optical fiber in a coherent optical communications system; converting the data to sequences of one of at least four levels according to a multilevel quadrature amplitude modulation (QAM) scheme, the levels including two outer levels and two or more inner levels; distorting only the two outer levels to reduce amplitudes of the two outer levels; and d…
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Electricity · mapped topic
Electricity · mapped topic
Electricity · mapped topic
- H04B10/541Primary
Electricity · mapped topic
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- What does patent US8948609B2 cover?
- According to a first aspect, techniques are provided to optimize a Mach-Zehnder modulator drive waveform by distorting the outer modulation levels of the waveform, thereby equalizing eye openings of the received optical field, and in particular creating a wider and more defined central eye opening of the received optical field. According to a second aspect, techniques are provided to adjust in-…
- Who is the assignee on this patent?
- Whiteaway James, Duthel Thomas, Geyer Jonas, and 1 more
- What technology area does this patent fall under?
- Primary CPC classification H04B10/541. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Feb 03 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).