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Journal of Engineering of Heilongjiang University

Achievement of optical bistable operation by using non-linear power spectrum of ASE light source

Chunyu Liu

Published Jan 1, 2011• 0 citations
OpenAlex

Abstract

By using non-linear spontaneous emission spectrum of erbium-doped fiber pumped in the active state,optical bistable operation was realized.Keeping two of three parameters the input light intensity,bias voltage and gain constant and adjusting the third parameter,bistable operation could be realized.An experimental result is agreed with theoretical analysis.The feasibility of ASE light source output power stability was discussed by utilizing a double feedback Structure of the optical bistable device.

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By using non-linear spontaneous emission spectrum of erbium-doped fiber pumped in the active state,optical bistable operation was realized.Keeping two of three parameters the input light intensity,bias voltage and gain constant and adjusting the third parameter,bistable operation could be realized.An experimental result is agreed with theoretical analysis.The feasibility of ASE light source output power stability was discussed by utilizing a double feedback Structure of the optical bistable device.
The structure of combining two segments of erbium-doped fiber (EDF) together—one EDF acting as an amplifier and the other as an absorber—has a special gain characteristic curve which has a maximum gain with an increase in the input signal power. This special gain characteristic curve can lead to an optical bistability (OB) phenomenon in a fiber-ring laser employing an EDF of this structure. By adjusting the pump light power injected into the second segment of the EDF, we can change the behavior of the absorber and can, therefore, control the range of the bistability region. A method is proposed to calculate the tunable optical bistability, and the calculation result is in accordance with our experiment.
Optical bistability phenomenon in a single fiber ring laser employing erbium-doped fiber (EDF) as gain medium is observed in our experiment. In the EDF amplifiers, the photons of pump light cannot completely transfer into that of signal light because of various attenuation factors. This part of loss (useless pump loss) and active spontaneous emission (ASE) can both lower the small-signal gain of the EDF, and can eventually result in the bistability phenomenon. The range of this bistability has a complicated relationship with the length of the EDF, the erbium-ion doping concentration, the cavity loss and the useless loss coefficient of the pump light.
A theoretical model that allows numerical simulations of optical bistability phenomena in CW-pumped erbium-doped fiber lasers is presented. Results of the simulations match correctly with previous experimental data. In order to simulate this phenomenon, the population inversion and optical powers longitudinal distributions along the active fiber have been considered. If this fiber is long enough, it has been found that the transition between the non-lasing and the lasing states involves a dramatic redistribution of the population inversion along the active medium. This fact makes that non-lasing and lasing states constitute different enough initial conditions which determine different final responses to the same control parameter, that is to say, bistability. On the other hand, a theoretical justification is found for a previous experimental result which pointed out that the bistability range becomes reduced if an external signal is launched to the cavity. Finally, the bistability range width dependence on the active fiber length is analyzed.
The nonlinear optical properties of many materials and devices have been the main object of research as potential candidates for sensing in different places. Just one of these properties has been, in most of the cases, the basis for the sensing operation. As a consequence, just one parameter can be detected. In this paper, although just one property will be employed too, we will show the possibility to sense different parameters with just one type of sensor. The way adopted in this work is the use of the optical bistability obtained from different photonic structures. Because this optical bistability has a strong dependence on many different parameters the possibility to sense different inputs appears. In our case, we will report the use of some non-linear optical devices, mainly Semiconductor Optical Amplifiers, as sensing elements. Because their outputs depend on many parameters, as the incident light wavelength, polarization, intensity and direction, applied voltage and feedback characteristics, they can be employed to detect, at the same time, different type of signals. This is because the way these different signals affect to the sensor response is very different too and appears under a different set of characteristics.