Controllable Optoelectric Composite Logic Gates Based On The Polarization Switching

At present,all-optical storage and all-optical logic signal processing devices are not mature enough,and all-optical network technology has not yet reached the practical stage.Optical packet switching technology is an effective way to solve the transmission and switching of optical network.The main work of this paper is listed in the following:(1)Starting from the coupling-wave theory of quasi-phase-matched(QPM)linear EO effect,the logical calculation methods of AND and OR gates with optoelectric composite were proposed based on a single PPLN.And those of the exclusive-OR gate,half-adder and half-substractor were further explored based on cascading PPLN crystal.The calculation scheme can be generalized to applications of more complex basic logic gate,and the various basic logic gates of more than three logic inputs and outputs.This work can be found in chapter 2.(2)For the PS and the nonlinear dynamic behaviors(NDBs)of the optically injected laser system composed of M-VCSEL and slave one(S-VCSEL),we put forward a novel manipulation scheme and explore their control law by means of EO modulation with quasi-phase matched technology in PPLN.It is found that the PS of the S-VCSEL subject to parallel or orthogonal optical injection takes on a change of periodic oscillation with the applied transverse electric field.The envelope trajectory of the oscillation peak appears to be a cosine curve.And that of the oscillation wave trough becomes a sine curve.For a certain fixed bias current of the M-VCSEL,the optically injected slave VCSEL can emit an arbitrary polarization mode and its NDBs experience different evolutions when the light from the M-VCSEL goes through EO intensity modulation.The related work can be found in chapter 3.(3)Based on the polarization switching mechanism in an optically injected vertical cavity surface emitting laser,and the new electro-optic modulation theory,we propose a novel approach to implement optoelectronic logic gates.Here,the two linearly polaruzed lights from the output of the laser are considered as two logic outputs.Under the electro-optic modulation,one of the logic outputs is the NOT operation with the other.With the same logic input signal,we perform various digital singal processing(AND,OR,XNOR,NAND,NOR and XOR)in the optical domain,controlling the logic operation of the applied electric field between the two logic input signals.On this basis,the logic operation of half-adder is further implemented.This work can be found in chapter 4.