Title :
Performance Improvement in Analog Photonics Link Incorporating Digital Post-Compensation and Low-Noise Electrical Amplifier
Author :
Yitang Dai ; Yan Cui ; Xi Liang ; Feifei Yin ; Jianqiang Li ; Kun Xu ; Jintong Lin
Author_Institution :
State Key Lab. of Inf. Photonics & Opt. Commun., Beijing Univ. of Posts & Telecommun., Beijing, China
Abstract :
In this paper, we investigate the performance improvement in analog photonics link incorporating digital signal processing technique and low-noise electrical amplifiers. The proposed linearization does not require to know the precise transfer function of the whole nonlinear system, which is achieved by directly acquiring the output third-order intercept point from the system hardware. Through using a high-performance pre- and post-amplifier, improved link noise figure and gain are obtained while the nonlinearity of the electrical amplifiers can be also compensated by the proposed algorithm. Experimentally, spurious-free dynamic range of 128.3 dB in 1-Hz bandwidth is achieved for a digitizer noise limited analog photonics link. The measured noise figure and gain of the photonics link are 8.9 and 27.5 dB, respectively.
Keywords :
analogue circuits; low noise amplifiers; microwave photonics; signal processing; analog photonics link; bandwidth 1 Hz; digital post-compensation; digital signal processing; digitizer noise; gain; linearization; link noise figure; low-noise electrical amplifiers; performance improvement; spurious-free dynamic range; Bandwidth; Gain; Modulation; Noise; Noise measurement; Photonics; Radio frequency; Radio frequency photonics; digital signal processing;
Journal_Title :
Photonics Journal, IEEE
DOI :
10.1109/JPHOT.2014.2332474
