title: All-optical analog-to-digital conversion scheme based on Sagnac loop and balanced receivers.
abstract: An all-optical analog-to-digital conversion scheme based on a Sagnac loop and balanced receivers is proposed and experimentally demonstrated. Adjustable phase shift about the transfer function of the Sagnac loop is obtained by using the multiwavelength optical pulses to realize the phase-shift optical quantization. Benefit from the complementary outputs at the transmitted and reflected ports of the Sagnac loop and balanced receiver can be used to obtain the quantized output binary signal for the encoding operation. A proof-of-concept experiment is implemented using a wavelength tunable continuous-wave laser diode. Using 16 different wavelengths, the 16 quantization levels are demonstrated and an effective number of bits (ENOB) of 4 bits is obtained.
authors.affiliation: Key Laboratory of Information Photonics & Optical Communications, Ministry of Education, Beijing University of Posts and Telecommunications, China. xukun@bupt.edu.cn
authors.forename: Kun
authors.initials: K
authors.lastname: Xu
authors.forename: Jian
authors.initials: J
authors.lastname: Niu
authors.forename: Yitang
authors.initials: Y
authors.lastname: Dai
authors.forename: Xiaoqiang
authors.initials: X
authors.lastname: Sun
authors.forename: Jian
authors.initials: J
authors.lastname: Dai
authors.forename: Jian
authors.initials: J
authors.lastname: Wu
authors.forename: Jintong
authors.initials: J
authors.lastname: Lin