Improve Gain, Noise figure and Spurious Free Dynamic Range in Intensity Modulation Analog Photonic link using Digital Signal postprocessing compensation by Linearized Downconverting Algorithm.

In this paper, we describe technique for performance improvement in analog photonics link incorporating digital signal post processing compensation technique by linearized down converting algorithm. We are investigating the performance components in this link and discuss the extent to which their performance varies with frequency, and show which of these components frequency-dependent parameters which affect; figure of merit in terms of gain, noise figure, and spurious free dynamic range. The proposed linearization does not require knowing the precise transfer function of the whole nonlinear system, which is achieved by directly acquiring the output third-order intercept point (IMD3) from Down converting algorithm. Using a high-performance improved link noise figure and gain are obtained while the nonlinearity can be also be compensated by the proposed algorithm. In our previous work measured noise figure and gainof the photonic link are 8.9 and 27.5 dB, respectively and spurious-free dynamic range of 128.3 dB in 1-Hz bandwidth which when compared by using linearized down converting algorithm improves to give noise figure and gain of the photonics link as 2.7 and 31.08 dB and spurious-free dynamic range of 130.49dB in 1-Hz bandwidth for a digitizer noise limited analog photonics link without using any cascade structure of pre and post amplifier