Abstract
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. However, when the control signal of 1505 nm to 1520 nm is injected into the cavity, laser begins to oscillate and OB appears. 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.
Highlights
We demonstrate a new scheme for realizing the Optical Bistability (OB) inside an all-fiber ring cavity with an external control field
Shao et al investigated OB in a single fiber ring laser. They show that useless pump loss and active spontaneous emission (ASE) can eventually resulted in the bistability phenomenon[13]
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
Summary
In order to gain deeper insight into the above phenomena, we give the numerical simulations . 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 transient (in other words, for the calculation of the point in the series). One can find the numerical results are the same as in the experimental results in Fig. 3 (the wavelength of the control signal has been fixed at 1515 nm). 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. Laser output power versus the control signal for different wavelengths of control signal
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