More than 100-wavelength-channel picosecond optical pulse generation from single laser source using supercontinuum in optical fibres

Morioka, Toshio; Mori, Koichi; Saruwatari, M.

doi:10.1049/el:19930576

Cited by 164 publications

(39 citation statements)

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“…It has a broad range of applications in areas such as optical fiber communication [1], optical coherence tomography [2] and frequency metrology [3]. Of particular importance is its use in the measurement of the carrier envelope offset frequency (f ceo ) of femtosecond optical frequency combs, wherein a spectrum extending over one optical octave is necessary when employing the f-2f interferometer technique.…”

Section: Introductionmentioning

confidence: 99%

Supercontinuum generation and carrier envelope offset frequency measurement in a tapered single-mode fiber

et al. 2014

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We report supercontinuum generation by launching femtosecond Yb-fiber laser pulses into a tapered single-mode fiber of 3-lm core diameter. A spectrum of more than one octave, from 550 to 1,400 nm, has been obtained with an output power of 1.3 W at a repetition rate of 250 MHz, corresponding to a coupling efficiency of up to 60 %. Using a typical f-2f interferometer, the carrier envelope offset frequency was measured and found to have a signal-to-noise ratio of nearly 30 dB.

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Section: Introductionmentioning

confidence: 99%

Supercontinuum generation and carrier envelope offset frequency measurement in a tapered single-mode fiber

et al. 2014

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Section: Introductionmentioning

confidence: 99%

“…Often SCG has been considered at visible wavelengths, which can be used for optical coherence tomography. But also at the telecommunication wavelengths around 1550 nm SCG also has possible applications, since it can be used to produce short pulses at multiple wavelengths simultaneously, which can be used for WDM communication systems [3].In the present work we propose a supercontinuum light source in the near infrared spectrum consisting of a capillary silica tube infiltrated with LC. The high electronic nonlinearity of the LC allows us to generate 100nm wide spectra from 10 ps pulses with peak power 1.5 kW.…”

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confidence: 99%

Supercontinuum Generation in Fibers Infiltrated with Liquid Crystals

Rasmussen

Bang

Lægsgaard

et al. 2006

2006 International Conference on Transparent Optical Networks

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Supercontinuum generation in a capillary tube infiltrated with a nematic liquid crystal is investigated theoretically in the near infrared region. A liquid crystal with a high electronic nonlinearity is chosen, which makes it possible to generate 100 nm wide supercontinua using 10 ps pulses with peak power 1.5 kW in a 10 cm long waveguide. The possibility of tuning the spectrum of the generated supercontinuum by changing the dispersion of the waveguide is also considered. It is found that the broadening of the spectrum in both the normal and anomalous regime is mainly due to self phase modulation, and therefore the dispersion of the waveguide is only of minor importance. The tuning of the dispersion is achieved by varying the temperature of the liquid crystal inside the capillary. Keywords: nonlinear optics, liquid crystals, supercontinuum generation. INTRODUCTIONRecently the possibility of making tunable optical devices based on liquid crystals (LCs) has attracted much attention [1]. Such devices can be realized, because the optical properties of LCs can be varied by changing the temperature or applying an external electric field. Together with the unique properties of photonic crystal fibers (PCFs) such as endlessly singlemode, and zero dispersion wavelengths in the visible spectrum, optical devices based on PCFs and LCs hold ongoing promise for potential applications in photonics. Along with these tunable properties, LCs also possess high nonlinearities. When using LCs in nonlinear optics it is often the reorientational nonlinearity of the LC that is being exploited, since this nonlinearity can be several orders of magnitude larger than in silica [2]. But since the time it takes to reorient the LC molecules is of the order of microseconds it cannot be used for supercontinuum generation (SCG) with short pulses, where the pulses are of the order of picoseconds or femtoseconds. For such short pulses it is the fast electronic nonlinearity of the material that is responsible for SCG. It turns out that this fast electronic nonlinearity for many LCs is about two orders of magnitude larger than in silica. Often SCG has been considered at visible wavelengths, which can be used for optical coherence tomography. But also at the telecommunication wavelengths around 1550 nm SCG also has possible applications, since it can be used to produce short pulses at multiple wavelengths simultaneously, which can be used for WDM communication systems [3].In the present work we propose a supercontinuum light source in the near infrared spectrum consisting of a capillary silica tube infiltrated with LC. The high electronic nonlinearity of the LC allows us to generate 100nm wide spectra from 10 ps pulses with peak power 1.5 kW. The temperature dependence of the refractive index of the LC allows us to change the dispersion profile of the device, and thereby investigate how the generated spectra are modified.

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“…It is also used for phase sensitive amplification [17], wavelength conversion [18][19][20] and optical signal reshaping [21]. The phenomenon also plays an important role in parametric oscillation [9], generation of frequency comb and supercontinuum in suitable fibers [22]. Supercontinuum (SC) generation is a process where different nonlinear mechanisms such as self phase modulation, cross phase modulation, stimulated Raman scattering and FWM interact together to create a large spectral enrichment.…”

Section: Introductionmentioning

confidence: 99%