Abstract
In this paper, a microwave frequency comb (MFC) is generated from a semiconductor laser subject to optical injection from a commercial small form-factor pluggable (SFP) optical module which is modulated by an arbitrary periodic signal. A sinusoidal signal or square wave signal is employed as the arbitrary periodic signal instead of the electric pulse signal adopted in the former references. When the frequency of the modulated signal is 1 GHz, the MFC with a maximal bandwidth of 15 GHz can be obtained. In addition, taking a sinusoidal signal as an example, the influence of the injection optical power to the slave laser and the modulation frequency of the optical module on the generation of the MFC is analyzed in detail. Finally, the results of MFC generated with a square wave signal injection are presented. The experimental results of this paper provide an important reference for the practical applications of MFC.
Highlights
With the external disturbances such as external optical injection, optical feedback, or opto-electric feedback, a semiconductor laser can produce some nonlinear dynamic phenomena, including period one oscillation [1, 2], perioddoubling oscillation, quasiperiod oscillation, and chaos [3,4,5,6,7,8]
By injecting the regular optical pulse generated by opto-electric feedback of semiconductor laser into the other semiconductor lasers, the microwave frequency comb (MFC) signal was generated with an amplitude of ±5 dB and bandwidth of 20 GHz [13, 14]
The numerical simulations and experiments have been presented for the generation of tunable MFC signal by semiconductor laser subject to optical injection, in which the master laser is modulated by a periodic electric pulse signal [18,19,20]
Summary
With the external disturbances such as external optical injection, optical feedback, or opto-electric feedback, a semiconductor laser can produce some nonlinear dynamic phenomena, including period one oscillation [1, 2], perioddoubling oscillation, quasiperiod oscillation, and chaos [3,4,5,6,7,8]. 3. Effect of the Injection Optical Power on MFC e initial frequency of the signal generator is 1 GHz with an amplitude of +0.7 V. e attenuation coefficient of the VOA is between 11 dB and 25 dB with an attenuation step of 1 dB. E comb line spacing of the MFC is equal to the frequency of the modulation signal, which is 1 GHz. e bandwidth of MFC can be determined by the electrical spectrum analyzer as follows. According to the above method of bandwidth determination, it can be concluded that the bandwidth of the MFC is 11 GHz for this case For this experiment, we measured the optical spectrum of the optical signal generated from SL after optical injection. When the attenuation coefficient is from 14 dB to 24 dB, the MFC bandwidth presents a general decreasing trend with the increasing attenuation coefficient. erefore, the bandwidth of the MFC generated in this experiment generally decreases with the decrease in the output power of the SFP module, but the overall fluctuation is not big
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