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提出了一种基于垂直腔表面发射激光器(VCSEL)的无本振光子微波上变频方案。该方案将相对低速的伪随机基带信号注入VCSEL中,利用注入信号的高次谐波注入锁定VCSEL。被锁定激光器波长与原注入光信号在谐振腔中相干差拍,产生上变频调幅微波信号。实验中利用2.5Gb/s非归零码强度调制信号注入锁定VCSEL,无需本振,实现了载波频率为14.3GHz的光子微波上变频,10kHz偏移处载波相位噪声达-81dBc/Hz。通过调节注入光信号的波长和功率,进一步实现载波频率在7.5~23GHz之间的调谐,验证了该方案的可行性,并对系统性能进行了误码分析,系统代价为1.4dB。结果证明该方案无需微波本振,仅需采用价格低廉的VCSEL即可实现光子微波上变频,从而为无线光混合接入网中光子微波信号产生技术提供了一种低成本的解决思路。
A non-local photon up-conversion scheme based on VCSEL is proposed. The scheme injects the relatively low-speed pseudo-random baseband signal into the VCSEL and locks the VCSEL by using the high-order harmonic injection of the injected signal. The locked laser wavelength and the original injected optical signal coherence beat in the resonant cavity to generate an upconverted amplitude modulated microwave signal. In this experiment, a 2.5Gb / s non-return-to-zero intensity modulated signal is injected into the locked VCSEL to achieve the up-conversion of photon microwave at a carrier frequency of 14.3 GHz and the carrier phase noise of -81 dBc / Hz at a frequency offset of 10 kHz without local oscillation. By adjusting the wavelength and power of the injected optical signal, the carrier frequency can be further tuned between 7.5 and 23 GHz. The feasibility of this scheme is verified and the error analysis of the system performance is carried out. The system cost is 1.4 dB. The results show that the proposed scheme does not need microwave local oscillator and can be upconverted by low cost VCSEL, which provides a low cost solution for photonic microwave signal generation in wireless hybrid access network.