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Low distortion slow light in flat Brillouin gain spectrum by using optical frequency comb
Taiji Sakamoto1, Takashi Yamamoto, Kazuyuki Shiraki
1NTT Access Network Service Systems Laboratories, NTT Corporation, 1-7-1 Hanabatake, Tsukuba, Ibaraki, 305-0805 Japan. taiji@ansl.ntt.co.jp
Optics Express
|June 12, 2008
Summary
Researchers developed a new method for slow light using an optical frequency comb, achieving broadband flat Brillouin gain with minimal distortion. This technique enables significant pulse delay while preserving pulse quality.
Area of Science:
- Photonics and Optical Engineering
- Quantum Optics
- Signal Processing
Background:
- Slow light techniques are crucial for optical buffering and signal processing.
- Stimulated Brillouin Scattering (SBS) offers a promising mechanism for slow light generation.
- Achieving broadband flat gain with low distortion in SBS has been a significant challenge.
Purpose of the Study:
- To introduce a novel method for generating slow light.
- To achieve broadband flat Brillouin gain with suppressed distortion.
- To enable large pulse delays for practical applications.
Main Methods:
- Utilized an optical frequency comb to generate pump light with 20 discrete line spectra.
- Employed a stimulated Brillouin scattering (SBS) gain medium.
- Characterized the generated slow light for bandwidth, gain flatness, pulse delay, and broadening factor.
Main Results:
- Achieved a flat SBS gain with a 200 MHz bandwidth.
- Realized a large relative pulse delay of 2.46.
- Suppressed the pulse broadening factor to less than 1.19 for a 5.44 ns pulse.
Conclusions:
- The proposed method effectively generates slow light with broadband flat gain and low distortion.
- The use of an optical frequency comb is a viable strategy for enhancing SBS-based slow light.
- This advancement holds potential for applications in optical communications and signal processing.
