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Phase sensitive amplification based on quadratic cascading in a periodically poled lithium niobate waveguide
Kwang Jo Lee1, Francesca Parmigiani, Sheng Liu
1Optoelectronics Research Centre, University of Southampton, Southampton, SO17 1BJ, United Kingdom. kjl@orc.soton.ac.uk
Optics Express
|December 10, 2009
Summary
We demonstrate a novel phase-sensitive amplification technique using cascaded nonlinear processes in a lithium niobate waveguide. This method offers broad gain bandwidths and significant amplification, showing practical viability for optical systems.
Area of Science:
- Photonics
- Nonlinear Optics
- Materials Science
Background:
- Phase-sensitive amplification is crucial for optical signal processing.
- Periodically poled lithium niobate (PPLN) waveguides offer unique nonlinear optical properties.
Purpose of the Study:
- To propose and experimentally demonstrate a novel phase-sensitive amplification (PSA) technique.
- To investigate PSA based on cascaded second harmonic generation (SHG) and difference frequency generation (DFG) in PPLN waveguides.
Main Methods:
- Utilized cascaded SHG and DFG processes within a 3-cm PPLN waveguide.
- Conducted proof-of-principle experiments and numerical simulations around 1550 nm.
- Investigated the impact of input pump power on gain/attenuation.
Main Results:
- Achieved excellent agreement between simulations and experimental results.
- Demonstrated broad achievable gain bandwidths.
- Observed a quadratic increase in gain/attenuation with pump power, reaching +/- 19.0 dB at 33 dBm pump power for a 3 cm waveguide.
Conclusions:
- The proposed PSA technique is valid and practical.
- The PPLN waveguide platform enables efficient and tunable optical amplification.
- Longer crystals can further enhance gain or reduce required pump power.
