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All-Optical Analog-to-Digital Conversion Using Inherent Multiwavelength Phase Shift in LiNbO _{3} Phase Modulator

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4 Author(s)
Qingwei Wu ; Dept. of Electron. Eng., Tsinghua Univ., Beijing ; Hongming Zhang ; Minyu Yao ; Wei Zhou

All-optical analog-to-digital conversion utilizing inherent multiwavelength phase shift in lithium niobate phase modulator is proposed. In the experimental demonstration, a wavelength-tunable continuous-wave laser diode and a lithium niobate phase modulator are used to quantize the sinusoidal tone electrical analog signal. Using 16 different wavelengths, an effective number of bits of 4.3-bit has been obtained after software sampling measurement. Benefits of the presented approach in this letter are its simple realization of the phase shift and high stability.

Published in:

Photonics Technology Letters, IEEE  (Volume:20 ,  Issue: 12 )