首页> 外文会议>Conference on broadband access communication technologies III; 20090128-29; San Jose, CA(US) >Linearity enhancement of uncooled DFB laser diode using opto-electrical predistortion method for radio-over-fiber systems
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Linearity enhancement of uncooled DFB laser diode using opto-electrical predistortion method for radio-over-fiber systems

机译:光电预失真方法在光纤无线系统中增强非冷却DFB激光二极管的线性

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摘要

We propose and demonstrate a pre-distortion method for reducing the third-order intermodulation distortion (IMD3) of the distributed-feedback laser diode. The pre-distortion scheme consists of two loops and uses two laser diodes (LD), a photodetector (PD), RF attenuators, RF combiners/dividers, and an RF amplifier. In our scheme, the error signal is generated by the slave LD through controlling the phase and attenuation adjustment in the inner loop and then drives the master LD to reduce nonlinear property in the outer loop. The experimental results show that the significant reduction of about 30 dB in the third-order intermodulation distortion (IMD3) is achieved at 2.4 GHz in the implemented system. For the broad frequency range from 1.97 GHz to 2.48 GHz (510 MHz), IMD3 is enhanced by more than 10 dB.
机译:我们提出并演示了一种用于减小分布式反馈激光二极管的三阶互调失真(IMD3)的预失真方法。预失真方案由两个环路组成,并使用两个激光二极管(LD),光电检测器(PD),RF衰减器,RF组合器/分频器和RF放大器。在我们的方案中,误差信号是通过控制内部环路中的相位和衰减调整由从属LD产生的,然后驱动主LD来减少外部环路中的非线性特性。实验结果表明,在所实现的系统中,在2.4 GHz下可以实现三阶互调失真(IMD3)的大约30 dB的显着降低。在1.97 GHz至2.48 GHz(510 MHz)的宽频率范围内,IMD3增强了10 dB以上。

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