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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.

Performance Improvement in Analog Photonics Link Incorporating Digital Post-Compensation and Low-Noise Electrical Amplifier