Power-induced polarization switching and bistability characteristics in 1550-nm VCSELs subjected to orthogonal optical injection

We design an 850 nm tunable vertical-cavity surface-emitting laser (VCSEL) structure using an internal-cavity sub-wavelength grating. The use of such a tuning structure allows for wider wavelength tuning range and more stable single-polarization as compared to conventional tunable VCSELs. The features of the internal-cavity grating effect on the wavelength tuning and polarization characteristics of the tunable VCSEL are analyzed. The simulation results show that the largest wavelength tuning range achieves 44.2 nm, and the maximum orthogonal polarization suppression ratio (OPSR) is 33.4 dB (TE-type) and 38.7 dB (TM-type).

Section: Introductionmentioning

confidence: 99%

Polarization control and tuning efficiency of tunable vertical-cavity surface-emitting laser with internal-cavity sub-wavelength grating*

Wang¹,

Zou²,

He³

et al. 2020

“…Several researches have been done to explore logic gates by using the chaotic synchronization between two semiconductor lasers [11][12][13][14][15] or the PB of the VCSEL [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] In 2013, according to a master-slave-response synchronization system of chaotic multiple-quantum-well lasers, Yan proposed the computing methods of chaotic XNOR, NOR, NOT logic gates, [11] and implemented optoelectronic NOR and XNOR logic gates by using parallel synchronization of three chaotic lasers. [13] Recently, different types of chaotic logic gates have been explored by using the PB of the optically injected VCSEL in different setups.…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable dynamic all-optical chaotic logic operations in an optically injected VCSEL

Zhong¹,

Xu²,

Luo³

et al. 2017

In a chaotic system of vertical cavity surface emitting laser (VCSEL) with external optical-injection, we propose a novel implementation scheme for reconfigurable dynamic all-optical chaotic logic operations (AOCLOs). Under different key parameters, such as the bias current, the injection strength and the frequency detuning of the injected light field and the VCSEL, we also explore the evolutions of the polarization-bistability with the amplitude of the injected light field when the output of VCSEL is chaotic wave. According to the dynamic evolutions, we find out the optimal value of the frequency detuning that is considered as a control logic signal, and further implement different AOCLOs, such as AND, NAND, OR, NOR, XOR, and XNOR, by controlling the logic operation of the control logic signal between two logic inputs. Moreover, the ability to reconstruct these logic operations is demonstrated under relatively low noise strength of the spontaneous emission.

“…The polarization switching (PS) or the polarization bistability (PB) can be induced by varying the pump current, or by changing the injected power, or by varying the detuning of the injected light. [2][3][4][5][6][7][8][9][10][11][12][13][14][15] Currently, these phenomena are generalized to apply into some areas of great concern, such as the optical logic devices and the storage installations of optical logic signals. [2][3][4][5][6][7] It is very attractive that the logic devices and the storage ones can be implemented based on the PS or the PB of the optically injected VCSEL.…”

Section: Introductionmentioning

confidence: 99%

“…[5]- [7], the slight variations of some key parameters, such as the pump current, the optical injection strength, and the detuning of the injected light, can induce the change of the output polarization state. [8][9][10][11][12][13][14][15][18][19][20][21][22][23][24][25][26][27][28][29][30][31] So the basic logic gates implemented in those setups have poor stability due to the instability of the PS. In Ref.…”

Section: Introductionmentioning

confidence: 99%

Controllable all-optical stochastic logic gates and their delay storages based on the cascaded VCSELs with optical-injection

Zhong

Luo

2016

Using the dynamical properties of the polarization bistability that depends on the detuning of the injected light, we propose a novel approach to implement reliable all-optical stochastic logic gates in the cascaded vertical cavity surface emitting lasers (VCSELs) with optical-injection. Here, two logic inputs are encoded in the detuning of the injected light from a tunable CW laser. The logic outputs are decoded from the two orthogonal polarization lights emitted from the optically injected VCSELs. For the same logic inputs, under electro-optic modulation, we perform various digital signal processing (NOT, AND, NAND, XOR, XNOR, OR, NOR) in the all-optical domain by controlling the logic operation of the applied electric field. Also we explore their delay storages by using the mechanism of the generalized chaotic synchronization. To quantify the reliabilities of these logic gates, we further demonstrate their success probabilities.