Optical signal transmitter and method for controlling polarization multiplexed optical signal

A technology for optical signals and transmitters, applied in polarization multiplexing systems, electromagnetic transmitters, multiplexing communications, etc., can solve problems such as optical power difference

Inactive Publication Date: 2011-03-16
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For this reason, due to factors such as manufacturing variations between modulator-to-modulator characteristics (e.g., loss of the LN modulator) and characteristic

Method used

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  • Optical signal transmitter and method for controlling polarization multiplexed optical signal
  • Optical signal transmitter and method for controlling polarization multiplexed optical signal
  • Optical signal transmitter and method for controlling polarization multiplexed optical signal

Examples

Experimental program
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Embodiment approach

[0144] Figure 19 is a diagram illustrating another structure of an optical signal transmitter. In this example, Figure 19 The second control system of the optical signal transmitter exemplified in is similar to Figure 17 The instantiated structure. However, Figure 19 The illustrated first control system is different from Figure 17 Example of the first control system.

[0145] Figure 19The illustrated optical signal transmitter has a photodetector 131 , a DC component detector 132 , and a controller 133 . In the same manner as the photodetector 51, the photodetector 131 converts the polarization-multiplexed optical signal split by the optical beam splitter into an electrical signal. The DC component detector 132 extracts the DC component of the electric signal obtained by the photodetector 131 . The DC component is detected, for example, by integrating or averaging the input signal from the photodetector 131 . Next, the DC component detector 132 outputs the detec...

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Abstract

The present invention provides an optical signal transmitter and a method for controlling a polarization multiplexed optical signal. The optical signal transmitter includes: first outer modulator to generate first modulated optical signal, the first outer modulator including a pair of optical paths and a first phase shifter to give phase difference to the pair of optical paths; second outer modulator to generate second modulated optical signal, the second outer modulator including a pair of optical paths and a second phase shifter to give phase difference to the pair of optical paths; combiner to generate polarization multiplexed optical signal by combining the first and second modulated optical signals; phase controller to control the phase difference by the first phase shifter to A-[Delta][phi] and control the phase difference by the second phase shifter to A+[Delta][phi]; and power controller to control at least one of the first and second outer modulators based on AC component of the polarization multiplexed optical signal.

Description

technical field [0001] The invention relates to an optical signal transmitter and a method for controlling polarization multiplexed optical signals. The present invention can be applied, for example, to optical signal transmitters used in polarization multiplexing transmission systems. Background technique [0002] There has been a rapid increase in demand for ultra-high-speed transmission systems with speeds exceeding 40 Gbit / s (eg 100 Gbit / s). Therefore, research and development is underway to actually realize an optical transmission system employing a multilevel modulation scheme (for example, QPSK modulation employing four-level phase modulation) that has been applied to wireless systems. However, as the transmission signal speed becomes higher, solving problems related to the feasibility (feasibility) of the electric signal circuit, and attenuation related to the optical transmission signal (spectral attenuation of the transmission signal due to the optical filter, and...

Claims

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Application Information

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IPC IPC(8): H04B10/04H04B10/12H04J14/06G02F1/01H04B10/07H04B10/2507H04B10/40H04B10/50H04B10/516H04B10/532H04B10/564H04B10/60H04B10/61H04J14/00H04J14/04
CPCH04B10/5053H04J14/06H04B10/50572H04B10/5057H04B10/50575
Inventor 秋山祐一水口纪明
Owner FUJITSU LTD
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