研究目的
Proposing a novel any point bias control scheme for the Mach–Zehnder modulator that is independent of input optical power fluctuations and suitable for various modulation formats.
研究成果
The proposed bias control technique effectively stabilizes the MZ modulator at any operating point, independent of input optical power fluctuations, and is suitable for various modulation formats without degrading system BER performance.
研究不足
The technique's effectiveness is demonstrated under controlled conditions with specific equipment. Real-world applications may require adjustments for different modulator types or environmental conditions.
1：Experimental Design and Method Selection:
The study involves theoretical analysis and experimental validation of a novel bias control technique for MZ modulators. The technique uses the average output optical power and its deviations as feedback signals.
2：Sample Selection and Data Sources:
A commercially available MZ modulator from JDS Uniphase is used, with specific parameters such as insertion loss and half-wave voltage.
3：List of Experimental Equipment and Materials:
Equipment includes a CW laser, MZ modulator, PIN photodiode, RF power detector, ADC, DAC, DSP unit, VOA, EDFA, BER analyzer, and sampling oscilloscope.
4：Experimental Procedures and Operational Workflow:
The setup involves modulating light from a CW laser, tapping a portion for feedback, processing the signal through the bias control system, and evaluating performance with BER measurements.
5：Data Analysis Methods:
The first and second derivatives of the average optical power and their ratio are calculated to maintain the desired bias point.
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