Design Of Driver Circuits For Photonic Integrated Chaotic Laser

Chaotic lasers are usually generated by simple optical feedback semiconductor lasers.However,it requires a variety of discrete optical devices and semiconductor lasers to generate chaotic light.The structure of the semiconductor laser with various external planar mirrors is not only bulky,but also susceptible to environmental impact,output instability and high power consumption,which greatly limits the application of chaotic lasers and the commercial application of chaotic laser-related industries.In order to overcome this problem,photon integrated chaotic laser--a light source which is easy to integrate,stable and broadband,has been widely concerned and studied.However,the current photon integrated chaotic lasers are driven by commercialized temperature-controller and current-driver sources.On the one hand,the commercial temperature controller has the problem of low control accuracy and the small change of temperature,which has an impact on the wavelength and threshold current of the laser.Especially,the photonic integrated chaotic laser is very sensitive to the wavelength and threshold current of the laser,which will lead to the instability of chaotic state.On the other hand,the commercialized temperature controller has a large volume,which is not conducive to the integration of the whole system.Recently,our research group has designed a high-precision temperature control and DC drive circuit system for laser,which can effectively adjust and control the temperature and the injection current of chaotic laser.However,compared with the DFB-packaged laser,the control stability of the output wavelength of the TOSA-packaged laser in the designed circuit is seriously reduced,and the control stability of the commercial NEWPORT driver for the TOSA laser is also decreased.Therefore,it is necessary to develop a stable and reliable chaotic laser temperature and current drive control circuit,and to realize the convenience and visual operation of chaotic laser control.Due to the high cost and huge volume of existing laser controllers,needing transmission control lines and fixtures to control the laser,unconducive to the integration and convenience of the control system,the lack of flexibility to control different types of TEC lasers,and the control effect's being not good,aiming at the problems in practical application,and on the basis of previous research,we improved the control circuit and designed a control system for different TEC chaotic semiconductor lasers.The design can achieve a stable control of temperature and current for different TEC chaotic lasers.The maximum voltage regulation range is 0-3.3V and the output current stability is less than 0.02%.By controlling the temperature,the output wavelength fluctuation of the laser can be stabilized within 9pm.Compared with the Newport driver,the normalized mean square deviation of the output wavelength of TOSA laser is reduced from 0.0044 to 0.0020,and the control stability is improved.