Xu Kun, Niu Jian, Dai Yitang, Sun Xiaoqiang, Dai Jian, Wu Jian, Lin Jintong
Key Laboratory of Information Photonics & Optical Communications, Ministry of Education, Beijing University of Posts and Telecommunications, China.
Appl Opt. 2011 May 10;50(14):1995-2000. doi: 10.1364/AO.50.001995.
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.
提出并通过实验验证了一种基于萨格纳克环和平衡接收机的全光模数转换方案。利用多波长光脉冲实现相移光量化，从而获得关于萨格纳克环传递函数的可调相移。得益于萨格纳克环透射和反射端口的互补输出，平衡接收机可用于获得用于编码操作的量化输出二进制信号。使用波长可调谐连续波激光二极管进行了概念验证实验。利用16种不同波长，展示了16个量化级别，并获得了4比特的有效位数（ENOB）。
