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Photonic generation of frequency-doubling Nyquist pulses using external modulation
Applied Optics
|September 14, 2023
Summary
This study introduces a novel method for creating frequency-doubling sinc-shaped optical Nyquist pulses using external modulation. The technique successfully generates phase-locked optical frequency combs and Nyquist pulses at various frequencies.
Area of Science:
- Photonics
- Optical Communications
- Signal Processing
Background:
- Optical Nyquist pulses are crucial for high-speed optical communication systems.
- Generating precisely shaped optical pulses with controlled frequency characteristics remains a challenge.
Purpose of the Study:
- To propose and demonstrate an approach for generating frequency-doubling sinc-shaped optical Nyquist pulses.
- To achieve phase-locked optical frequency combs (OFCs) with equal frequency intervals.
Main Methods:
- Utilizing external modulation techniques, including dual-electrode Mach-Zehnder modulators for optical carrier suppression.
- Employing an optical interleaver to split and manipulate phase-locked OFCs.
- Implementing a dual-parallel Mach-Zehnder modulator for radio frequency (RF) modulation quadrupling.
Main Results:
- Successfully generated a phase-locked 12-line flat optical frequency comb (OFC).
- Achieved sinc-shaped optical Nyquist pulses with equal frequency intervals.
- Demonstrated Nyquist pulses at 2.5 GHz, 5 GHz, 10 GHz, and 15 GHz.
Conclusions:
- The proposed external modulation approach is effective for generating frequency-doubling optical Nyquist pulses.
- This method offers a viable solution for creating spectrally precise optical signals for advanced communication systems.
