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Ultrafast optical pulse digitization with unary spectrally encoded cross-phase modulation
Applied Optics
|May 20, 1997
Summary
This study introduces a novel method for digitizing ultrashort laser pulse intensity using cross-phase modulation (XPM). This technique enables high-speed optical signal processing with potential for 5-GHz sampling rates.
Area of Science:
- Nonlinear Optics
- Optical Signal Processing
- Ultrafast Lasers
Background:
- High-speed optical signal processing requires efficient methods for digitizing optical signal intensity.
- Nonlinear optical phenomena offer pathways for manipulating and encoding optical signals.
Purpose of the Study:
- To describe a method for digitizing ultrashort laser pulse intensity for high-speed optical signal processing.
- To demonstrate a unary cross-phase modulation (XPM) encoding approach for digital encoding of laser pulse intensity.
Main Methods:
- Utilized spectral broadening of a probe pulse by an intense signal pulse via cross-phase modulation (XPM).
- Varied signal pulse intensity to generate different spectral widths for digital encoding.
- Employed a 50-ps time-divided multiplexing pulse train with waveguide components and variable-length fibers.
Main Results:
- Demonstrated a unary XPM encoding approach for digitizing laser pulse intensity.
- Achieved spectral encoding that can be translated into digital formats.
- Showcased the potential for a 5-GHz sampling rate with 16-level accuracy.
Conclusions:
- The described spectral encoding scheme based on XPM is effective for digitizing ultrashort laser pulse intensity.
- This method facilitates high-speed optical signal processing applications.
- The approach offers a promising route towards achieving high sampling rates and accuracy in optical systems.
