Wavelength division multiplexing optical transmission apparatus and wavelength division multiplexing optical transmission method
US-2016006537-A1 · Jan 7, 2016 · US
Optical signal transmitter
US9419720B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9419720-B2 |
| Application number | US-201514629123-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 23, 2015 |
| Priority date | Sep 26, 2008 |
| Publication date | Aug 16, 2016 |
| Grant date | Aug 16, 2016 |
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Abstract
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An optical signal transmitter includes first and second modulation units, a combiner, and a control unit. The first and second modulation units generate first and second modulated optical signals, respectively. The combiner combines the first and second modulated optical signals to generate a polarization multiplexed optical signal. The control unit controls at least one of the first and second modulation units so that the optical powers of the first and second modulated optical signals become approximately equal to each other.
First claim
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What is claimed is: 1. An optical signal transmitter comprising: an intensity modulation unit configured to adjust an intensity of a first wavelength component and a second wavelength component, a first wavelength of the first wavelength component being different from a second wavelength of the second wavelength component; a demultiplexer configured to extract the first wavelength component and the second wavelength component; a first modulation unit configured to generate a first modulated optical signal from the first wavelength component obtained by the demultiplexer; a second modulation unit configured to generate a second modulated optical signal from the second wavelength component obtained by the demultiplexer; a multiplexer configured to multiplex the first modulated optical signal and the second modulated optical signal to generate a multiplexed optical signal; and a control unit configured to control the intensity modulation unit so that optical powers of the first modulated optical signal and the second modulated optical signal become approximately equal to each other. 2. The optical signal transmitter according to claim 1 , wherein the intensity modulation unit has an LN modulator; and wherein the control unit controls a bias of the LN modulator. 3. The optical signal transmitter according to claim 1 , wherein the multiplexer performs polarization multiplexing of the first modulated optical signal and the second modulated optical signal.
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Classifications
- H04B10/54Primary
Intensity modulation · CPC title
using external modulation · CPC title
Polarisation multiplex systems · CPC title
for the control of polarisation, e.g. state of polarisation [SOP] control, polarisation scrambling, TE-TM mode conversion or separation (G02F1/0353 takes precedence) · CPC title
Digital phase modulation · CPC title
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- What does patent US9419720B2 cover?
- An optical signal transmitter includes first and second modulation units, a combiner, and a control unit. The first and second modulation units generate first and second modulated optical signals, respectively. The combiner combines the first and second modulated optical signals to generate a polarization multiplexed optical signal. The control unit controls at least one of the first and second…
- Who is the assignee on this patent?
- Fujitsu Ltd
- What technology area does this patent fall under?
- Primary CPC classification H04B10/54. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Aug 16 2016 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 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).