Ultrafast all‐optical switching using pulse trapping by ultrashort soliton pulse in birefringent optical fiber
01 Feb 2007-Electrical Engineering in Japan (Wiley Subscription Services, Inc., A Wiley Company)-Vol. 158, Iss: 3, pp 38-44
TL;DR: In this paper, the authors demonstrate the use of pulse trapping in birefringent optical fiber for all-optical switching and show that only a signal pulse in the pulse train with temporal separation of about 1.2 ps is successfully picked off.
Abstract: Ultrafast all-optical switching by use of pulse trapping in birefringent optical fiber is demonstrated both experimentally and numerically. The wavelengths of the control soliton pulse and the trapped soliton pulse are shifted to satisfy the condition of group velocity matching. Furthermore, the energy of the trapped pulse is increased through Raman gain of the control pulse. Only a signal pulse in the pulse train with temporal separation of about 1.2 ps is successfully picked off. The repetition frequency corresponds to 0.83 THz. The spectrogram of the optical switching is directly observed using the X-FROG technique. © 2006 Wiley Periodicals, Inc. Electr Eng Jpn, 158(3): 38–44, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.20470
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TL;DR: In this article, the authors obtained soliton solutions for Kudryashov's law which stem from quadrupled-power law and dual form of nonlocal nonlinearity, and exhibited the conservation law to paint a complete picture to the model.
39 citations
13 Oct 2010
TL;DR: In this paper, the authors used titania nanotubes (TiO 2 ) and tungsten oxide nanospheres (WO3) as devices of saturable absorption for a fiber laser in ring configuration to optical short-pulse generation.
Abstract: Experimental studies of titania nanotubes (TiO 2 ) and tungsten oxide nanospheres (WO3) as devices of saturable
absorption for a fiber laser in ring configuration to optical short-pulse generation are presented. A deposition technique,
based on optical pressure radiation generated from a coherent source at 1550 nm is used to deposit the nanostructured
materials. Since this nanomaterials can be deposited directly on the optical fiber, this proposal results very interesting for
applications of saturable absorbers. Experimental results, by using nanotubes TiO 2 and nanospheres deposited on the
fiber as a saturable absorption device, show that the TiO 2 nanotubes exhibit better saturable absorption properties than
WO 3 nanospheres, generating pulses with a wavelength of 1550 nm, frequency of 10 MHz, temporally width of 4.5 ps
and an output power of 1 mW.
4 citations
Cites background from "Ultrafast all‐optical switching usi..."
...Introduction Currently, there is a growing demand for short-pulsed laser working in the 1550 nm band for use in various science field including ultra-high speed communications [1,2], all-optical signal processing [3,4] and optical metrology [5,6]....
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TL;DR: In this article , the authors proposed an all-optical pulse switchings (AOPS) scheme where a strong pulsed field is used to switch another pulsed input signal.
Abstract: All-optical switching used to switch the input optical signals without any electro-optical conversion plays a vital role in the next generation of optical information processing devices. Even all-optical switchings (AOSs) with continuous input signals have been widely studied, all-optical pulse switchings (AOPSs) whose input signals are pulse sequences have rarely been investigated because of the time-dependent Hamiltonian, especially for dissipative quantum systems. In this paper, we propose an AOPS scheme, where a strong pulsed field is used to switch another pulsed input signal. With the help of Floquet-Lindblad theory, we identify the control field that can effectively turn on/off the input signal whose amplitude envelope is a square-wave (SW) pulse train in a three-level dissipative system. By comparing the properties of the AOPSs controlled by a continuous-wave (CW) field and an SW control field, we find that the SW field is more suitable to be a practical tool for controlling the input SW signal. It is interesting to impress that the switching efficacy is robust against pulse errors. The proposed protocol is readily implemented in atomic gases or superconducting circuits and corresponds to AOPSs or all-microwave pulse switchings.
1 citations
References
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TL;DR: In this article, an optical nonlinear element asymmetrically placed in a short fiber loop is used for demultiplexing Tb/s pulse trains that requires less than 1 pJ of switching energy and can be integrated on a chip.
Abstract: A device capable of demultiplexing Tb/s pulse trains that requires less than 1 pJ of switching energy and can be integrated on a chip is presented. The device consists of an optical nonlinear element asymmetrically placed in a short fiber loop. Its switching time is determined by the off-center position of the nonlinear element within the loop, and therefore it can use the strong, slow optical nonlinearities found in semiconductors, which all other fast demultiplexers seek to avoid. The switch's operation at 50 Gb/s is demonstrated, using 600-fJ control pulses. >
676 citations
TL;DR: In this paper, the amplitude and phase of weak ultrashort pulses are characterized using a spetrally resolved cross-correlation signal of a weak test pulse with a fully characterized intensive reference pulse.
Abstract: We present a new method to characterize the amplitude and phase of weak ultrashort pulses. Our method is based on the spetrally resolved crosscorrelation signal of a weak test pulse with a fully characterized intensive reference pulse and requires no spectral overlap between the signal and the reference. To retrieve the amplitude and phase of the test pulse, we use an iterative Fourier transform algorithm with generalized projections.
284 citations
TL;DR: In this paper, the authors proposed a system of wavelength-tunable femtosecond (fs) fundamental soliton pulse generation with a monocolored soliton, not multicolored ones, with the ideal sech/sup 2/shape.
Abstract: Using passively mode-locked femtosecond (fs) fiber laser and polarization maintaining fibers, the compact system of wavelength-tunable femtosecond (fs) fundamental soliton pulse generation is realized. The monocolored soliton pulse, not multicolored ones, with the ideal sech/sup 2/ shape is generated, and its wavelength can be linearly shifted by varying merely the fiber-input power in the wide wavelength region of 1.56-1.78 /spl mu/m for a 75-m fiber. The soliton pulses of less than 200 fs are generated with the high conversion efficiency of 75%-85%. This system can be widely used as a portable and practical wavelength-tunable fs optical pulse sources.
201 citations
TL;DR: In this article, the all-fiber nonlinear optical loop mirror (NOLM) is used in the two-wavelength version to show good contrast stable switching of selected pulses from a stream of short pulses.
Abstract: The all fibre nonlinear optical loop mirror (NOLM) is used in the two wavelength version to show good contrast stable switching of selected pulses from a stream of short pulses. The polarisation properties of the device enable operation as a genuine four port demultiplexer.
140 citations
TL;DR: Almost perfect conversion efficiencies are observed for soliton self-frequency shift and pulse trapping by the ultrashort soliton pulse of an optical fiber.
Abstract: A new phenomenon of pulse trapping by the ultrashort soliton pulse of an optical fiber has been experimentally observed. The trapped pulse in the normal-dispersion region copropagates with the soliton pulse in the anomalous-dispersion region along the fiber, and the wavelength of the trapped pulse is shifted to satisfy the condition of group-velocity matching. The wavelengths of the soliton pulse and the trapped pulse change almost continuously as the power of the soliton pulse is varied. Almost perfect conversion efficiencies are observed for soliton self-frequency shift and pulse trapping.
122 citations