In this work, we have experimentally investigated the generation of broadband Optical Frequency Comb (OFC) based on a gain-switching Vertical-Cavity Surface-Emitting Laser (VCSEL) driven by different modulation signals (including triangular-current, sinusoidal-current and square-current) under optical injection. For such a system, various modulation signals are first used to drive the VCSEL into the gain-switching state, and then an external optical injection is further introduced into the gain-switching VCSEL to generate broadband OFC. The experiment results show that the OFC output from the square current modulated VCSEL subject to optical injection has better performance compared to other two modulation signals. Driven by square signal with matched operation parameters, a high-quality OFC can be acquired, with stable comb lines, high coherence, wide bandwidth of 72.0 GHz within 10 dB amplitude variation and low single sideband phase noise at the fundamental frequency below −113.3 dBc/Hz at 10 kHz.
We propose a scheme to generate wavelength-tunable broadband Optical Frequency Combs (OFCs) based on an optical injection gain-switched Weak-Resonant-Cavity Fabry-Perot Laser Diode (WRC-FPLD). Firstly, a sinusoidal signal with frequency of 1.6 GHz and power of 19 dBm is utilized to drive the WRC-FPLD into the gain-switched state. Then, external optical injection is introduced into the gain-switched WRC-FPLD for generating wavelength-tunable broadband OFCs. The experimental results demonstrate that, when the wavelength of injected light is in the middle of the two modes, the OFCs with larger bandwidth can be obtained. When the wavelength and power of the injection light are 1545.6522 nm and 3.397 μW, respectively, the maximum bandwidth of generated OFC can arrive at 76.8 GHz (49 comb lines), and the single sideband phase noise for the fundamental frequency of the beat signal is as low as -125.5 dBc/Hz@10 kHz. The coherence of comb lines increases with the decrease of modulation frequency. Through varying the wavelength of injection light and selecting the matched injection power, the central wavelength of OFC can be adjusted within the range of (1525 nm, 1565 nm).
We have experimentally investigated the generation of tunable and broadband Optical Frequency Comb (OFC) based on a gain-switching vertical-cavity surface emitting laser driven by a square wave signal under optical injection. During the experiment, the influences of modulation frequency fm and injection light wavelength λion OFC performances are analyzed systematically. The experimental results indicate that under suitable operation parameters, an OFC with bandwidth of 77.0 GHz within 10 dB power variation and single sideband phase noise of -115.7 dBc/Hz @ 10 kHz can be generated. Also, during the modulation frequency range of 1.5 GHz - 2.8 GHz, broadband OFCs with bandwidth exceeding 70.0 GHz can be obtained based on the square-current modulated VCSEL under optical injection.
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