基于偏振旋转光反馈下的外光注入VCSEL产生高性能毫米波

本文提出一种基于偏振旋转光反馈下的外光注入垂直腔 表面发射激光器(VCSEL)产生高性能毫米波的方案, 并利用描述外部扰动下VCSEL动态特性的自旋反转模型(SFM), 对所产生的毫米波的特性进行了数值研究. 研究结果表明: 一个受到主VCSEL(M-VCSEL)光注入的副VCSEL(S-VCSEL)在一定条件下可以产生单周期(P1)振荡, 即在光波上调制了一个微波信号. 通过调节外光注入强度ξ_i以及S-VCSEL与M-VCSEL之间频率失谐Δν, 可以获得频率在30---60 GHz范围内连续可调的毫米波信号. 在外光注入VCSEL中引入偏振旋转光反馈, 通过选取合适的反馈强度ξ_f以及反馈延迟时间τ, 产生的毫米波信号的线宽可以得到明显窄化. 对于光注入S-VCSEL所产生的线宽为5.509 MHz的毫米波, 在引入偏振旋转光反馈后, 毫米波线宽可以降低到230.2 kHz. 本文的研究对高速光载无线(RoF)系统中优质毫米波信号的获取具有一定的参考意义.

Optical generation of high-quality millimeter-wave based on an optically injected VCSEL subject to polarization-rotated external optical feedback

A scheme of optical generation of high-quality millimeter-wave based on the optically injected vertical-cavity- surface-emitting laser(VCSEL) subject to polarization-rotated optical feedback is proposed in this paper.Based on the spin-flip model(SFM),wich external disturbances taken into account,the performances of the millimeter-wave generated by this scheme are numerically investigated. The results show that under suitable operation conditions,a slave VCSEL(S-VCSEL) injected by a master VCSEL(M-VCSEL) will operate in a period-one(P1) oscillation state and the output optical intensity of S-VCSEL looks like being modulated by a microwave signal.By adjusting the injection strengthξ_i and the frequency detuningΔv between S-VCSEL and M-VCSEL,a millimeter-wave, whose frequency can be continuously adjusted in a large range from 30 GHz to 60 GHz,is obtained.After introducing polarizationrotated optical feedback,the linewidth of millimeter-wave can be obviously narrowed by adjusting the feedback strengthξ_i and the feedback delay timeτ.For a millimeter-wave with a linewidth of 5.509 MHz,generated by the optically injected VCSEL.its linewidth can be reduced to 230.2 kHz under optimum feedback parameters.The results obtained in this paper are helpful for acquiring high-quality millimeter-wave used in high speed Radio-over-Fiber(RoF) system.