Linearized Modulator for Suboctave-Bandpass Optical Analog Links

摘要

The spurious free dynamic range of a suboctave externally modulated opticalanalog link can be improved (to >140 dB Hz exp 4/5) with modest received optical power and little noise figure penalty by using a simple linearized modulator. Its design consists of two standard Mach-Zehnder interferometric modulators in series, and so can operate at microwave frequencies. This paper develops standardized measures of linearized modulator performance, and uses them to evaluate the modulator; link examples are also given. A simple experiment verifies the basic theoretical predictions.