研究目的
To calculate the impact of nonlinearity in a modified uni-traveling carrier (MUTC) photodetector on an RF-modulated frequency comb generated using short optical pulses, considering the effect of modulation depth on nonlinearity in frequency combs.
研究成果
The study concludes that when including bleaching, the OIP3n increases with an increase in modulation depth at frequencies above 2 GHz, leading to decreased distortion. This effect is attributed to bleaching attenuating lower frequencies more than higher frequencies, with the preferential attenuation increasing as the modulation depth increases.
研究不足
The study focuses on the impact of nonlinearity and modulation depth on RF-modulated frequency combs in an MUTC photodetector, with specific conditions such as pulse duration and repetition frequency. The negative impact on the signal-to-noise ratio due to decreased responsivity should be considered in future work.
1：Experimental Design and Method Selection:
The study involves calculating the device nonlinearity for the MUTC photodetector with a pulsed optical input, using a one-dimensional drift-diffusion model incorporating an empirical model of bleaching.
2：Sample Selection and Data Sources:
The optical input is a train of short optical pulses with a duration of 100 fs and a repetition frequency of 50 MHz, modulated at microwave frequencies.
3：List of Experimental Equipment and Materials:
A Calmar Mendecino passively-modelocked erbium doped fiber laser was used to generate the optical pulses.
4：Experimental Procedures and Operational Workflow:
The output of the modelocked laser was passed through a variable attenuator and calibrated optical tap with a 90/10 split, illuminating the MUTC photodetector. The average optical power and average photocurrent were measured as the optical attenuator was adjusted.
5：Data Analysis Methods:
The three-tone modulation technique was used to calculate the IMD2n and IMD3n in the pulsed mode for modulation depths of 4% and 8% for each comb line n.
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