Generation of Tunable and Ultra-Broadband Microwave Frequency Combs Based on a Semiconductor Laser Subject to Pulse Injection From a Current Modulated Laser
We have experimentally demonstrated and characterized the generation of tunable and ultra-broadband microwave frequency combs (MFCs) based on a slave laser (SL) subject to regular pulse injection from a current modulated master laser (ML). Under modulation frequency <italic>f<sub>m</s...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IEEE
2018-01-01
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| Series: | IEEE Photonics Journal |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/8543585/ |
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| Summary: | We have experimentally demonstrated and characterized the generation of tunable and ultra-broadband microwave frequency combs (MFCs) based on a slave laser (SL) subject to regular pulse injection from a current modulated master laser (ML). Under modulation frequency <italic>f<sub>m</sub></italic> = 1.2 GHz and modulation power <italic>P<sub>m</sub> =</italic> 22 dBm, the current modulated ML is driven into a regular pulse state, and a seed MFC with 14.4 GHz bandwidth within a ±5 dB amplitude variation can be obtained. Such a seed MFC is then injected into the SL for producing final MFC with higher performances. For a fixed detuning frequency <italic>f<sub>i</sub></italic> = 0 GHz and optimized injection power <italic>P<sub>i</sub></italic> = 2060 <italic>μ</italic>W, the bandwidth of the final MFC is increased to 33.6 GHz, and the single-sideband phase noises of all comb lines of the MFC within the bandwidth can be decreased to below –90.9 dBc/Hz@10 kHz. Additionally, the influences of <italic>P<sub>i</sub></italic> and <italic>f<sub>m</sub></italic> on the MFC bandwidth are also analyzed. The experimental results are in agreement with numerical simulations to a certain extent. |
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| ISSN: | 1943-0655 |