研究目的
Investigating the performance of an octave-band voltage-controlled oscillator phase-locked on the envelope of the pulse train from a mode-locked laser, employing a balanced Mach-Zehnder modulator with two photodiodes as a phase detector.
研究成果
The developed OEPLL demonstrates superior phase noise and jitter performance with an octave-band frequency range, marking an advancement in MZM-based OEPLL technology. The system's in-band phase noise of -135 dBc/Hz and jitter as low as 13.8 fs at 10.032 GHz highlight its potential for applications requiring ultra-low phase noise signal sources.
研究不足
The phase noise performance is influenced by the MLL source quality and the VCO's higher phase noise at 1 MHz frequency offset, which affects the overall jitter performance.
1：Experimental Design and Method Selection:
The OEPLL design employs a balanced Mach-Zehnder modulator (MZM) as a phase detector, utilizing a mode-locked laser (MLL) as a reference. The system includes a loop filter and an octave-band switched-capacitor voltage-controlled oscillator (VCO).
2：Sample Selection and Data Sources:
An ORIGAMI MLL was selected for its low phase noise, with a repetition rate of 76 MHz. The VCO provides a high tuning range.
3：List of Experimental Equipment and Materials:
Includes a balanced MZM (X-cut Lithium Niobate Dual-Output Modulator from EOSPACE), InGaAs PIN photodiodes, and a PCB containing the loop filter and auxiliary circuitry.
4：Experimental Procedures and Operational Workflow:
The MZM samples the VCO signal with the reference optical pulse train. The photodetector difference current indicates the phase difference, which is used to phase-lock the VCO signal onto the reference pulse train envelope.
5：Data Analysis Methods:
Phase noise and jitter measurements were conducted using an Anapico phase noise analyzer (APPH20G).
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