Low-loss and low-dispersion-slope highly nonlinear fibers

Takahashi, Masanori; Sugizaki, Ryuichi; Hiroishi, J.; Tadakuma, Masateru; Taniguchi, Yoshio; Yagi, T.

doi:10.1109/jlt.2005.857771

Cited by 78 publications

(29 citation statements)

References 24 publications

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“…Although one can increase the input power P and then reduce the length of the fiber L, such a way requires a high-power optical amplifier and results in additional costs. To solve such problems, highly nonlinear fibers (HNLFs) [16][17][18][19] were developed to have the nonlinear coefficient γ that is ten times larger than conventional transmission fibers. Thanks to the features of HNLF, fiber-based nonlinear applications have become much practical.…”

Section: Ldmentioning

confidence: 99%

“…A standard SMF has the SiO 2 -based core with a small amount of GeO 2 as a dopant, and n 2 is estimated to be n 2 ∼ 2.6 × 10 −20 m 2 /W [15]. The n 2 of SiO 2 -based core could be increased by doping GeO 2 in a high concentration [83], and it has been shown that a conventional HNLF has n 2 of 4-5×10 −20 m 2 /W [17]. A much effective way to realize a fiber with an extremely large n 2 is to employ non-silica glasses that have large intrinsic nonlinearity as the material.…”

Section: Basic Structure Of Hnlfmentioning

confidence: 99%

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Pulse compression techniques using highly nonlinear fibers

Inoue¹,

Namiki

2008

Laser & Photonics Reviews

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We review optical pulse compression techniques based on optical fibers. After discussing the fundamental issues on pulse compression, we summarize and categorize various kinds of techniques for pulse compression. We then focus on the use of highly nonlinear fiber (HNLF) in a pulse compressor to improve the performance. Introducing a figure of merit, we discuss which kind of HNLF of those recently reported is the most suitable for applications to pulse compression. As a HNLFbased optical pulse compressor, we review the technologies of the comb-like profiled fiber (CPF) which consists of alternate concatenations of HNLF and single-mode fiber. Discussing the features of CPF, we show that CPF is a truly practical and flexible solution for optical pulse compression. Finally, we refer to a new class of pulse compression called "the stationary rescaled pulse (SRP)", which is a characteristic nonlinear stationary pulse propagating through CPF. The propagation characteristics of the SRP provides a systematic and efficient design method of CPF as well as optical pulse compression that has never been achieved by conventional pulse compression schemes. As an example, a highly steep pulse compression in CPF is demonstrated, where a pulse is compressed by a factor of 2.1 per step of the CPF, and a 7.2 ps-width optical pulse is compressed to 0.38 ps with a four-step structure of CPF. Delay time [ps] Autocorrelation [a.u.] Wavelength [nm] 1540 1550 1560 -8 -4 0 4 8 Spectrum [20dB/div] Input After 1st step After 4th step After 3rd step After 2nd step Input After 1st step After 4th step After 3rd step After 2nd stepWaveforms of the optical pulses measured at the input and the output of each step of a four-step comb-like profiled fiber.

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Section: Ldmentioning

confidence: 99%

Section: Basic Structure Of Hnlfmentioning

confidence: 99%

Pulse compression techniques using highly nonlinear fibers

Inoue¹,

Namiki

2008

Laser & Photonics Reviews

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“…While the control of dispersion in optical fibers is often associated with dispersion compensation in optical communications networks 2 there is also interest in its control for the purposes of harnessing nonlinear optical effects. Parametric processes 3 and supercontinuum generation 4 rely upon tailoring of the dispersion profile of the fiber to enhance energy transfer and thus time has been spent over the last several decades to develop technologies to fine control waveguide dispersion 5 .…”

Section: Introductionmentioning

confidence: 99%

Inverse scattering designs of dispersion-engineered single-mode planar waveguides

May

Poletti

Zervas

2014

Integrated Optics: Devices, Materials, and Technologies XVIII

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We use an inverse-scattering (IS) approach to design single-mode waveguides with controlled linear and higher-order dispersion. The technique is based on a numerical solution to the Gelfand-Levitan-Marchenko integral equation, for the inversion of rational reflection coefficients with arbitrarily large number of leaky poles. We show that common features of dispersion-engineered waveguides such as trenches, rings and oscillations in the refractive index profile come naturally from the IS algorithm without any a priori assumptions. Increasing the leaky-pole number increases the dispersion map granularity and allows design of waveguides with identical low order and differing higher order dispersion coefficients.

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“…those based on four wave mixing, a low and flat group velocity dispersion (D) is desirable, if not essential. The current state-of-the art is represented by conventional highly nonlinear fibres, offering very low dispersion slope (DS) in the C+L band [1] and by silica holey fibres (HFs), which allow a flat dispersion over an even larger wavelength range [2]. In both cases however the maximum achievable γ is limited to only 10 to 30 times that of a standard SMF, and therefore hundreds meters of fibre are generally required to achieve the desired nonlinear phase shift.…”

Section: Introductionmentioning

confidence: 99%