Optical bistability in fiber ring resonator containing an EDFA

Dou, Na; Li, Chunfei

doi:10.1016/j.optcom.2007.11.087

Cited by 11 publications

(3 citation statements)

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“…Fewer investigations on fiber ring resonators have been done to develop optical bistable devices [10][11][12]. The majority of the analysis on the optical bistable behavior of fiber systems has been carried out using the so-called graphical method.…”

Section: Introductionmentioning

confidence: 99%

“…One of the approaches to analyze the complex photonic circuits and fast calculation of optical transfer functions in the Z domain is the signal flow graph (SFG) method, proposed by Mason [20,21] and developed by Moslehi et al [22]. There are two practical approaches to introduce the nonlinear effects: increase the length of the fiber or increase the optical power within the fiber [12]. One of the approaches to achieve nonlinearity in ring resonators with fixed radius is the iterative method, in which the input optical pulse is rotated iteratively though a ring resonator to compensate the required length for emergence of nonlinear phenomena [10,[23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

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Ultrafast all-optical switching using signal flow graph for PANDA resonator

Bahadoran¹,

Ali²,

Yupapin³

2013

Appl. Opt.

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In this paper, the bifurcation behavior of light in the PANDA ring resonator is investigated using the signal flow graph (SFG) method, where the optical transfer function for the through and drop ports of the PANDA Vernier system are derived. The optical nonlinear phenomena, such as bistability, Ikeda instability, and dynamics of light in the silicon-on-insulator (SOI) PANDA ring resonator with four couplers are studied. The transmission curves for bistability and instability as a function of the resonant mode numbers and coupling coefficients for the coupler are derived by the SFG method and simulated. The proposed system has an advantage as no optical pumping component is required. Simulated results show that closed-loop bistable switching can be generated and achieved by varying mode resonant numbers in the SOI-PANDA Vernier resonator, where a smooth and closed-loop bistable switching with low relative output/input power can be obtained and realized. The minimum through-port switching time of 1.1 ps for resonant mode numbers of 5;4;4 and minimum drop port switching time of 1.96 ps for resonant mode numbers of 9;7;7 of the PANDA Vernier resonator are achieved, which makes the PANDA Vernier resonator an operative component for optical applications, such as optical signal processing and a fast switching key in photonics integrated circuits.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ultrafast all-optical switching using signal flow graph for PANDA resonator

Bahadoran¹,

Ali²,

Yupapin³

2013

Appl. Opt.

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“…However, the Kerr nonlinearity in silicon fiber is very low. To overcome this problem, they suggest that using the fiber ring resonator for accumulating the nonlinear phase shift required for optical switching 15,16) .…”

Section: Introductionmentioning

confidence: 99%

Optical bistability of polythiophene derivative/polymethylmethacrylate composite thin films

et al. 2009

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Polymer composite materials have considerable attention in the modern technology and are an object of numerous fundamental and scientific investigations. Polymer composite materials have advances in physical and optical properties over single materials. It is well known that the refractive index of the optical materials play an major role for all optical functional properties. The change of refractive index due to optical intensity is important for making photo-devices such as optical switching, optical memory, and logic circuits. In the present work, we have investigated the polythiophene family derivatives i.e. poly(3-octylthiophene) (P3OT) and polymethylmethacrylate (PMMA) composites materials. The poly(3-octylthiophene)/polymethylmethacrylate (P3OT/PMMA) composite thin films were prepared by spin coating as composing a prism-coupling waveguide. The UV-visible absorption spectrum of the composite film was recorded in the range 300-900 nm using UV-visible spectrophotometer. The thickness of the composite films was measured as 3 μm using a surface profile measuring system. The optical bistability of P3OT/PMMA waveguide was measured using an Nd:YAG laser with a wavelength of 1064 nm, pulse width of 5 ns and a repetition frequency of 10 Hz. The optical bistable characteristics of P3OT/PMMA composite films were measured with different input laser power intensities (0.16, 0.20, 0.24 and 0.26 GW/m 2 ) and the measured optical bistability shows good stability and hysteresis characteristics.However, in terms of the input laser power dependence of optical bistability, the switching on-off position shifts with the increase in the input laser power intensity was observed. In the input laser power dependence of optical bistability, the switching on-off position shifted with the increase of input laser power intensity. The optical bistable behaviors are very stable for P3OT/PMMA composite thin film after exposed to organic gas. It suggests that the composite film exposed to organic gas has larger grain size, better molecular orientation, homogeneous bulk and smooth surface than before organic gas treatment. The effect of organic gas treatment and PMMA molecular weight on the optical bistable behavior of P3OT/PMMA composite waveguide was investigated. The shift of on-off position of the optical bistability is decreased with the composite films treated with organic gas due to the smooth surface, better molecular orientation than before organic gas treatment.

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