Optical Parametric Chirped Pulse
Amplification in an Optical Fiber
C. Caucheteur, D. Bigourd, E. Hugonnot, P. Szriftgiser, A. Kudlinski,
M. Gonzalez-Herraez and A. Mussot
Optical parametric chirped pulse amplification (OPCPA) is now a
well-established technique for amplifying high-energy ultrashort pulses. 1
Experimentally, these systems are very
cumbersome and require a careful alignment of both signal and pump. To overcome these problems, the optical fiber
technology has great potential, as it also
provides compactness and low sensitivity to temperature. Although impressive
performances have been reported with
Yb-doped fiber technology, 2 the important amount of amplified spontaneous
emission in the short pulse regime is
detrimental for many applications. 1
;erefore, Hanna et al. have proposed combining advantages of all
fibered systems and of parametric
amplification in passive optical fibers. 3
;ese fiber-optic parametric amplifiers
(FOPAs) rely now on the third-order
nonlinearity, and their broad bandwidth,
high gain, wavelength flexibility and
wavelength conversion properties have
been reported in the context of telecommunications applications. 4
In this work, we demonstrate a fiber-based optical parametric chirped pulse
amplification (FOPCPA) in an all-fiber
configuration. ;e setup is represented
in (a). Both stretching and compression
stages are realized with the same linearly
chirped fiber Bragg grating (CFBG), and
the pulse amplification is performed in a
continuous-wave-pumped FOPA. Prior
to being amplified, the input pulses
are stretched to about 190 ps (about 30
times larger than the initial duration) by
experiencing a reflection into the short-wavelength port of the CFBG.
;e chirped signal and the pump are
launched inside the highly nonlinear fiber (HNLF), in which the amplification
process occurs. After propagation in the
HNLF, the amplified pulses are filtered
and again sent into the CFBG, this time
TL- 1 PM EDFA
(a) Experimental setup of FOPCPA. TL: tunable laser, PM: phase modulator, RFA: radiofrequency ampli;er, EDFA: erbium doped ;ber ampli;er, TF: tunable ;lter, PC 1, 2,3: polarization controllers, HNLF: highly nonlinear ;ber, CFBG: chirped ;ber Bragg grating. (b) Optical
spectra in the linear and saturated regimes. (b) Whole spectrum and (c) normalized close-up
on the signal pulses, plotted in linear scale. The input signal spectrum has been superimposed in solid line in the (c) picture.
Wavelength [nm] Wavelength [nm]
1,530 1,550 1,570 1,590 1,546 1,547 1,548
through the long-wavelength port, in
order to recompress them.
;e gain obtained for smallest signals
(about 25 dB) in the linear regime of the
amplifier is very close to the gain of a
weak monochromatic signal ( 24. 6 dB). In
the saturated regime, the gain is reduced
to about 20 dB and harmonics of the
signal and the idler waves are generated in
this four-wave mixing process (b).
;is multiple-wave interaction, which is
associated with the saturation of the amplifier, leads to a broadening and distortion of
the output pulses spectrum, as in (b) and
(c). As a consequence, the output signal
pulses keep their Gaussian temporal shape
and recover their initial pulse duration after
recompression in the linear regime, while
they are strongly distorted in the saturated
one and then become slightly larger.
We successfully amplified picosecond
Fourier-transform pulses at 1,550 nm
by 24. 6 dB and recompressed them into
their initial duration without any signifi-
cant spectral nor temporal distortions. 6
We are looking to develop a similar sys-
tem around 1 µm with pulsed pumps and
microstructured optical fibers. It should
integrate the first stage of OPCPA chain
in high-energy-amplification chains. t
C. Caucheteur, P. Szriftgiser, A. Kudlinski and
A. Mussot ( firstname.lastname@example.org) are with
Université Lille 1, Cedex, France. Caucheteur is also
with the Electromagnetism and Telecom Unit, faculté
polytechnique, Université de Mons, Belgium. D.
Bigourd and E. Hugonnot are with the Commissariat
à l’Energie Atomique, CESTA, Le Barp, France. M.
Gonzalez-Herraez is with the department of electronics, University of Alcalá, Alcalá de Henares, Spain.
1. J. D. Zuegel et al. Fus. Sci. Technol. 49, 453 (2006).
2. T. Eidam et al. Opt. Lett. 35, 94 (2010).
3. M. Hanna et al. Opt. Express 14, 2783 (2006).
4. M. E. Marhic. Fiber Optical Parametric Amplifiers, Oscillators and Related Devices, Cambridge University Press,
5. C. Caucheteur et al. Opt. Lett. 35, 1786 (2010).
6. D. Bigourd, L. Lago, A. Mussot, A. Kudlinski, J. Gleyze,
and E. Hugonnot, Opt. Lett. 35, 3480-3482 (2010)
34 | OPN Optics & Photonics News