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Radio-over-fiber transmission using semiconductor laser under weak external light injection

机译:在弱外部光注入下使用半导体激光器进行光纤无线电传输

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摘要

Optical injection locking is a promising method to overcome the limitations exhibited by directly modulated distributed feedback lasers in analog radio-over-fiber applications. Here the effects of optical injection locking are investigated experimentally for relatively low injection ratio, which is favored for practical applications. The measured responses of optical injection locking with low injection ratio still show distinctive modulation characteristics, controllable by the frequency detuning and the injection ratios. At the higher positive detuning the resonance peak can extend to 22 GHz (limited only by the analyzer instrument), which is 4.2 times greater than in the free running case. Reduction in the noise level becomes better as the system moves towards negative detuning. The reduction reaches to 5.97 dB at the resonance peak for -20 GHz detuning and a -2.9 dB injection ratio. Moreover, reduction also can be realized in the low frequency regime 0-10 GHz. We also achieved a 9.1 dB spur free dynamic range improvement. The error vector magnitude requirement specification of 3.1 % for 64-QAM OFDMA can be satisfied by an injection locked laser with 5-10 dB enhancements, comparing to a free running laser even after transmission over different transmission distances.
机译:光学注入锁定是一种有前途的方法,可以克服直接调制的分布式反馈激光器在模拟无线光纤应用中表现出的局限性。在这里,对于相对较低的注入比率,通过实验研究了光学注入锁定的效果,这对于实际应用是有利的。低注入比率的光学注入锁定的测量响应仍然显示出独特的调制特性,可通过频率失谐和注入比率来控制。在较高的正失谐下,谐振峰可以扩展到22 GHz(仅受分析仪仪器的限制),是自由运行情况下的4.2倍。随着系统趋向负失谐,降低噪声水平变得更好。对于-20 GHz失谐和-2.9 dB的注入比,在共振峰处的降低达到5.97 dB。而且,在0-10GHz的低频状态下也可以实现减小。我们还实现了9.1 dB无杂散动态范围的改进。与自由运行的激光器相比,即使在不同的传输距离上进行传输之后,与自由运行的激光器相比,通过64%QAM OFDMA的3.1%的误差矢量幅度要求规格也可以满足5-10 dB增强的注入锁定激光器的要求。

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