Abstract
A novel scheme of all-optical analog-to-digital conversion (ADC) based on polarization modulation and wavelength-dependent birefringence is proposed and experimentally demonstrated. A polarization modulator and a polarization beam splitter are employed to realize polarization modulation and polarization modulation-to-intensity modulation conversion. Thanks to the wavelength-dependent birefringence in a section of a polarization-maintaining fiber, phase-shift optical quantization is obtained by adjusting the wavelength spacing of a multiwavelength pulse laser array. A proof-of-concept experiment is performed. An all-optical ADC with 16 quantization levels and an effective number of bits of 3.7 is demonstrated by using 8 different wavelengths with identical wavelength interval.
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