Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group
Journal Home About Issues in Progress Current Issue All Issues Feature Issues

Enhanced Supercontinuum Generation through Dispersion-Management

J. Nathan Kutz, C. Lyngå, and B. J. Eggleton

Open Access Open Access

Abstract

We show in theory and simulation that the supercontinuum generation from an initial continuous wave field in a highly nonlinear fiber operating near the zero-dispersion point can be significantly enhanced with the aid of dispersion management. We characterize the spectral broadening as a process initiated by modulational instability, but driven by the zero-dispersion dynamics of an N-soliton interacting with the asymmetric phase profile generated by the Raman effect, self-steepening effect, and/or higher-order dispersion. Higher N-soliton values lead to shorter pulses and a broader spectrum. This insight allows us to use dispersion management in conjunction with modulational instability to effectively increase the N value and greatly enhance the supercontiuum generation process.

©2005 Optical Society of America

Full Article  |  PDF Article
More Like This
Cavity dispersion management in continuous-wave supercontinuum generation

Sonia Martin-Lopez, Pedro Corredera, and Miguel Gonzalez-Herraez
Opt. Express 17(15) 12785-12793 (2009)

Continuous-wave pumping in the anomalous- and normal-dispersion regimes of nonlinear fibers for supercontinuum generation

Akheelesh K. Abeeluck and Clifford Headley
Opt. Lett. 30(1) 61-63 (2005)

Cascaded interactions between Raman induced solitons and dispersive waves in photonic crystal fibers at the advanced stage of supercontinuum generation

Rodislav Driben, Fedor Mitschke, and Nickolai Zhavoronkov
Opt. Express 18(25) 25993-25998 (2010)

View More...

Cited By

Optica participates in Crossref's Cited-By Linking service. Citing articles from Optica Publishing Group journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (6)
Fig. 1.
Fig. 1. Fundamental process of supercontinuum generation from a CW source. Here the MI induced instability is followed by the creation of an ultra-short (broadband) pulse train which is driven by the nonlinear interaction of the Raman effect in the zero-dispersion limit. As shown in Sec. 3, the introduction of the dispersion map helps to significantly broaden the spectrum.

Download Full Size | PDF

Fig. 2.
Fig. 2. Qualitative depiction of the eigenvalue distribution of the Zakharov-Shabat problem [20] without (a) and with (b) initial phase chirp [13] in arbitrary units. Note that the application of a large symmetric phase chirp splits the double eigenvalues of (a) as shown in (b) giving the Y-shaped zipper spectrum. Recall that the eigenvalue Zakharov-Shabat eigenvalues are given by λn =kn +iηn . Further, the real part of the eigenvalue kn determines the ejection velocity while the imaginary part ηn determines the ejected soliton pulse height and width.

Download Full Size | PDF

Fig. 3.
Fig. 3. Evolution of initial 5-soliton. The top figure shows the time-domain evolution and the ejected one-solitons due to the Raman response (TR =3 fs). The bottom figure shows the associated spectrum and the Raman red shift. Note the ejection of a≈150 fs pulse.

Download Full Size | PDF

Fig. 4.
Fig. 4. Onset of MI from an initial 800 mW CW wave (light line) for the dispersion values D̄=0.1 ps/[km-nm] (top) and D̄=1 ps/[km-nm] (bottom). The MI begins to grow substantially (bold lines) over a propagation distance of 1 km. The modulation cells, which are enclosed by the dotted lines, begin the ejection process illustrated in Fig. 3. The modulational cells for this example capture energies of ≈0.2 pJ (top) and ≈1.6 pJ (bottom) respectively.

Download Full Size | PDF

Fig. 5.
Fig. 5. Field propagation over 7 km from an initial 250 mW CW source showing the onset of MI followed pulse compression. Without dispersion management (top), the resulting FWHM pulse train is on the order of picoseconds which gives a spectrum of ≈60 nm for a D̄=0.2 ps/[km-nm]. With dispersion management (5 km of D̄=5 ps/[km-nm] fiber followed by 2 km of D̄=0.2 ps/[km-nm] fiber) gives more than four times the spectral broadening and results in a≈250 nm spectral width. The resulting pulse train (bottom) results in FWHM pulses on the order of femtoseconds.

Download Full Size | PDF

Fig. 6.
Fig. 6. Output spectrum after 7 km from an initial 250 mWCWsource. Without dispersion management (light line), the spectrum is ≈60 nm for a D̄=0.2 ps/[km-nm]. Dispersion management (5 km of D̄=5 ps/[km-nm] fiber followed by 2 km of D̄=0.2 ps/[km-nm] fiber) gives more than four times the spectral broadening and results in a≈250 nm spectral width (bold line).

Download Full Size | PDF

Equations (5)

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

i ∂ Q ∂ Z + 1 2 ∂ 2 Q ∂ T 2 + ∣ Q ∣ 2 Q − τ Q ∂ ( ∣ Q ∣ 2 ) ∂ T = 0
∂ ( ∣ Q ( 0 , T ) ∣ 2 ) ∂ T = ∂ ( N 2 sech 2 T ) ∂ T = − 2 N 2 sech 2 T tanh T .
Q = Q ( 0 , T ) exp [ − i ( 2 τ N 2 sech 2 T tanh T ) Z ] .
Q n ( Z , T ) = 2 η n sech [ 2 η n ( T − π κ n Z ) ] exp [ − i 2 T + i π ( κ n 2 − η 2 ) Z ] .
i ∂ Q ∂ Z + 1 2 ∂ 2 Q ∂ T 2 + i β ∂ 3 Q ∂ T 3 + ∣ Q ∣ 2 Q − τ Q ∂ ( ∣ Q ∣ 2 ) ∂ T + i σ ∂ ( ∣ Q ∣ 2 Q ) ∂ T + i Γ Q = 0

Metrics

Select as filters
Select Topics Cancel
Top
       
© Copyright 2023 | Optica Publishing Group. All Rights Reserved
Privacy | Terms of Use