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Improvement of dispersion tolerance for electrical-binary-signal-based duobinary transmitters
Optics Express
|June 6, 2009
Summary
We improved dispersion tolerance in duobinary transmitters using a dual-arm modulator. This method enabled successful 200 km single-mode fiber transmission by optimizing signal timing and voltage.
Area of Science:
- Optical communications
- Photonics engineering
- Signal processing
Background:
- Dispersion limits transmission distance in optical fiber systems.
- Duobinary signaling offers spectral efficiency but can be sensitive to dispersion.
- Mach-Zehnder modulators are key components in optical transmitters.
Purpose of the Study:
- To enhance the dispersion tolerance of electrical-binary-signal-based duobinary transmitters.
- To enable reliable data transmission over extended fiber lengths.
- To optimize the performance of duobinary systems using advanced modulation techniques.
Main Methods:
- Implemented a dual-arm Mach-Zehnder modulator.
- Drove the modulator with two complementary binary signals.
- Optimized the relative time delay between signals and driving voltage.
Main Results:
- Achieved successful data transmission over 200 km of single-mode fiber.
- Demonstrated improved dispersion tolerance compared to conventional methods.
- Verified the effectiveness of the optimized dual-arm modulator approach.
Conclusions:
- The proposed dual-arm Mach-Zehnder modulator design significantly improves dispersion tolerance.
- Optimizing signal delay and driving voltage is crucial for long-haul duobinary transmission.
- This technique offers a viable solution for extending the reach of spectrally efficient optical communication systems.
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