Optical Bistability: Controlling Light with Light
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J App Phys 15 Phys Rev Lett 21 Springer, Berlin. Phys Rev A 77 5 Boyd RW Nonlinear optics. Academic, San Diego. J Appl Phys 15 EPL Europhys Lett 3 Phys Rev A 88 5 J Appl Phys 8 We demonstrate a new scheme for realizing the Optical Bistability OB inside an all-fiber ring cavity with an external control field. In the absence of the external control field, the pump power is fixed below the threshold value of laser, and there is no laser in the cavity.
We found that the wavelength and power of the control signal can affect the OB behavior dramatically, which can be used to manipulate efficiently the threshold intensity and the hysteresis loop. We also give an explanation of the bistability phenomenon based on numerical simulations, which are agreed very well with our experimental results.
Our scheme may provide some new possibilities for technological applications in optical power limiters, switches or memories. In the past few decades, Optical Bistability OB has been the subject of many recent studies because of its potential wide applications in optical transistor, memory element, and all-optical switching 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8. Meanwhile, many researchers have been carried out to obtain OB in erbium-doped fiber laser EDFL 9 , 10 , 11 , 12 , 13 , 14 , For example, Jung Mi Oh and Donghan Lee demonstrated strong optical bistability in a widely tunable L-band erbium-doped fiber ring laser pumped by a nm laser diode.
They found that the bistable region is as much as mW wide, and which can be controlled by the lasing wavelength or the length of erbium-doped fiber Shao et al. They show that useless pump loss and active spontaneous emission ASE can eventually resulted in the bistability phenomenon Later on, optical bistability in saturable absorber-based single-frequency Brillouin fiber laser has also been experimentally investigated Quite recently, Juan C.
Under appropriate working conditions, different bistable behaviors can be found In this work, we investigate the OB inside an all-fiber ring cavity with an external control field. Our work is mainly based on the 13 , 14 , however, which is drastically different from those works. The major differences are obtained as follows. First and foremost is that we are interested in investigating the Optical bistability inside an all-fiber ring cavity with an external control field when the pump power is fixed below the threshold value of laser.
Optical Bistability: Controlling Light by Light
Second, when the control signal was injected into the cavity, laser begins to oscillate and the OB appears. The wavelength and power of the control signal can affect the OB behavior dramatically, which can be used to manipulate efficiently the threshold intensity and the hysteresis loop.
Third, we give an explanation of the bistability phenomenon based on numerical simulations, which are agreed very well with our experimental results. The experiment setup is shown in Fig. The control signal is injected into ring cavity through the Tunable Laser TL, Agilent B , and isolator2 ensures the cavity light does not damage the control laser source. The reason can be qualitatively explained as follows. When the control signal is taken into account, there appears a supplementary pump power that affects the absorption of EDF.
In Fig. Clearly, the bistable region depends crucially on the pump power, which might be useful to control the threshold value and the hysteresis cycle width of the OB simply by adjusting the power of pump laser. In order to gain deeper insight into the above phenomena, we also give the numerical simulations in this Section.
Next, we calculated series of laser responses as a function of the control signal power, first in ascending order and then in descending order P c1 , P c2 , …P c,n-1 , P c,n , P c,n-1 ,… P c2 , P c1. For carrying out the simulations as close as possible to the experimental conditions, every laser response is obtained as the final result of a transient process that is fully calculated. This final result is taken as the initial condition for the calculation of the next transient in other words, for the calculation of the next point in the series. Transient calculations are carried out by means of the model described in ref.
The transmission factor of the ring passive part transmission of all the elements except the active fiber plus transmission of the active-passive fiber splices has been estimated in 0. For the calculations, we also need the radius of the doped transversal area in the active fiber. As the manufacturer does not provide this information, we have tried several values.
Here we present the results obtained with a radius of 3. The other parameters in the numerical simulations have been specified in the previous experiment section. So, in order to reproduce the experiment shown in Fig. From Fig. The effect of the pump power on the width of the bistable region has also been numerically simulated in Fig.
As shown in Fig. The numerical results provide a clear explanation of the OB observed. Each laser response in CW regime takes place after a transient stage. When all the laser inputs pump and control power are stable along time, the laser adopts a certain population distribution and there is a balance between emission and absorption at every point along the fiber.
Optical Bistability Controlling Light with Light - AbeBooks
If the power of control signal is changed, the balance is suddenly altered and the population distribution experiences a transient stage until the system reaches a new balance. Thanks in advance for your time. Skip to content. Search for books, journals or webpages All Pages Books Journals.
View on ScienceDirect. Authors: Hyatt Gibbs. Imprint: Academic Press. Published Date: 4th November Page Count: Flexible - Read on multiple operating systems and devices.
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Institutional Subscription. Free Shipping Free global shipping No minimum order. Preface Chapter 1. Introduction to Optical Bistability 1. Definition and Types of optical Bistability 1. Optical Logic with Bistable Devices 1. Optical Bistability in Lasers 1. Steady-State Models of Optical Bistability 2. Model of Absorptive Optical Bistability 2. Simple Model of Dispersive Optical Bistability 2. Bonifacio-Lugiato Models 2. Mean-Field Theory of Absorptive Bistability 2. Mixed Absorptive and Dispersive Optical Bistability 2.
Conditions for Optical Bistability 2. Standing-Wave Effects 2. Unsaturable Background Absorption 2.
Graphical Solutions 2. Potential Well Description 2. Spectra 2. Transverse Effects 2. Analytical Approaches 2.
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Numerical Solutions 2. Relation to Other Work 2. Intrinsic Optical Bistability Experiments 3. Early Searches for Absorptive Optical Bistability 3.