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40 GHz adiabatic compression of a modulator based dual frequency beat signal using Raman amplification in dispersion decreasing fiber

Ju Han Lee, Young-Geun Han, Sang Bae Lee, Taichi Kogure, and David J. Richardson

Open Access Open Access

Abstract

We demonstrate the use of distributed Raman amplification (DRA) in a dispersion decreasing fiber (DDF) for the efficiency enhancement of adiabatic soliton compression of a dual frequency beat signal. We compress a 40 GHz beat signal generated from a LiNbO3 modulator at a driving RF frequency of 20 GHz into ~ 2.2 ps soliton pulses using DRA in a 20 km DDF. The generation of high quality of soliton pulses from the 40 GHz sinusoidal beat signal is readily achieved with a significantly enhanced efficiency using DDF based DRA, compared to the case of using a DDF without DRA or a DSF with DRA.

©2004 Optical Society of America

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Figures (6)
Fig. 1.
Fig. 1. (a) Experimental setup. (b) Dispersion profile of the dispersion decreasing fiber (DDF).

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Fig. 2.
Fig. 2. Numerically calculated results after the DDF with DRA. (a) Normalized output soliton pulses at a repetition rate of 40 GHz. (b) The corresponding optical spectrum of the soliton train.

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Fig. 3.
Fig. 3. Measured autocorrelation traces of the output compressed pulses after the DDF for both the case with and without distributed Raman amplification.

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Fig. 4.
Fig. 4. (a) Measured autocorrelation trace of a single pulse compressed with distributed Raman amplification in the DDF. (b) The corresponding optical spectrum of the pulse.

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Fig. 5.
Fig. 5. Measured autocorrelation traces of the compressed pulses after a 20 km long DSF with a GVD of 3.8 ps/nm-km for both the case with and without distributed Raman amplification.

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Fig. 6.
Fig. 6. (a) Measured autocorrelation trace of a single pulse compressed with distributed Raman amplification in the DSF. (b) The corresponding optical spectrum of the pulse.

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Equations (4)

Equations on this page are rendered with MathJax. Learn more.

dI s dz = g R I p I s − α s I s ,
dI p dz = λ s λ p g R I p I s + α p I p ,
∂ I s ∂ z = − ρ s ( z ) · I s
∂ A ∂ z + β 1 ∂ A ∂ t + i 2 β 2 ∂ 2 A ∂ t 2 − 1 6 β 3 ∂ 3 A ∂ t 2 + ρ s ( z ) 2 A = iγ ∣ A ∣ 2 A
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