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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Photonic preprocessor for analog-to-digital-converter using a cavity-less pulse source.

Andreas O J Wiberg1, Lan Liu, Zhi Tong

  • 1University of California San Diego, Department of Electrical and Computer Engineering, 9500 Gilman Drive, La Jolla, California 92093, USA. awiberg@ucsd.edu

Optics Express
|December 25, 2012
PubMed
Summary

This study demonstrates a photonic preprocessor for analog-to-digital conversion, achieving high effective number of bits at 10 GHz and 40 GHz using a novel optical pulse source.

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Area of Science:

  • Photonics
  • Optical Engineering
  • Signal Processing

Background:

  • Analog-to-digital converters (ADCs) are crucial components in modern electronics.
  • Photonic approaches offer potential advantages in speed and bandwidth for ADCs.

Purpose of the Study:

  • To demonstrate and characterize a photonic preprocessor for analog-to-digital conversion.
  • To evaluate the performance of a cavity-less optical pulse source for this application.

Main Methods:

  • Utilized a cavity-less optical pulse source generating 3 ps pulses at a 2 GHz repetition rate.
  • Employed cascaded amplitude and phase modulators to create chirped pulses.
  • Compressed pulses using dispersion compensating fiber.
  • Performed sampling with a dual-output Mach-Zehnder modulator for noise reduction.

Main Results:

  • Achieved 8 effective number of bits (ENOB) at 10 GHz and 7.0 ENOB at 40 GHz.
  • Demonstrated a 3 dB noise reduction using the complimentary output of the modulator.
  • Confirmed that phase noise is dictated by the radio frequency (RF) source.

Conclusions:

  • The demonstrated photonic preprocessor shows high performance for analog-to-digital conversion.
  • The cavity-less optical pulse source is suitable for high-speed sampling applications.
  • Photonic solutions can significantly enhance ADC capabilities.