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Phase Sensitive Amplifiers For Ultra-low

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Ultra-low-noise Optical Amplifiers Using Periodically Poled LiNbO3 (PPLN) Waveguides Cutting-edge technology Phase Sensitive Amplifiers for Ultra-low-noise Optical Amplification R－3 When conventional optical amplifiers are used to amplify optical signals in photonic network systems, deterioration in signal quality is theoretically unavoidable. To overcome this problem, we are developing a phase sensitive amplifier (PSA) that can perform ultra low-noise optical amplification. Amplification using conventional amplifier Transmitter Receiver E.g., 16QAM signal Transmitter Receiver Improvement of the SNR Signal decision is difficult What is PSA? Signal Features Amplification using PSA*1 Amplification Nonlinear material (e.g., PPLN*2) Amplified signal In-phase 90°De-amplification Quadrature ■ A compact and practical low noise amplifier is possible by employing periodically poled lithium niobate (PPLN) waveguide as a nonlinear optical device (Feature #1). ■ The amplifier achieves low noise amplification without SNR degradation (i.e. noise figure of 0 dB) by using phase-sensitive parametric amplification (Feature #2). ■ Operating the PSA using a non-degenerative parametric process enables amplification of optical signals with a higher modulation format used in digital coherent systems. Pump Pump Conventional Q Excess noise amplifier Feature #1 Output I Input Pump PSA Q Application Scenarios ■ Ultra-low-noise repeater amplifiers in over-1-Tbit/s photonic transport systems connected between major cities. No excess1/G Output noise I Output Signal input PPLN*2 module *1 PSA: Phase Sensitive Amplifier *2 PPLN: Periodically Poled Lithium Niobate Input Feature #2 Image of constellation diagram 〈Contact〉[email protected] Copyright © 2015 NTT. All Rights Reserved.