title: All-optical binary phase-coded UWB signal generation for multi-user UWB communications.
abstract: An all-optical incoherent scheme for generation of binary phase-coded ultra-wideband (UWB) signals is proposed and experimentally demonstrated. The binary phase coding is performed based on all-optical phase modulation in a semiconductor optical amplifier (SOA) and phase modulation to intensity modulation (PM-IM) conversion in a fiber delay interferometer (DI) that serves as a multichannel frequency discriminator. By locating the phase-modulated light waves at the positive and negative slopes of the DI transmission spectra, binary phase encoded UWB codes (0 and π) are generated. We also experimentally demonstrate a bipolar UWB coding system with a code length of 4, operating at 1.25 Gb/s. And the decoding is analyzed as well. Our proposed system has potential application in future high-speed UWB impulse radio over optical fiber access networks.
authors.affiliation: Wuhan National Lab for Optoelectronics, College of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 43007, China. jjdong@mail.hust.edu.cn
authors.forename: Jianji
authors.initials: J
authors.lastname: Dong
authors.forename: Yuan
authors.initials: Y
authors.lastname: Yu
authors.forename: Yin
authors.initials: Y
authors.lastname: Zhang
authors.forename: Xiang
authors.initials: X
authors.lastname: Li
authors.forename: Dexiu
authors.initials: D
authors.lastname: Huang
authors.forename: Xinliang
authors.initials: X
authors.lastname: Zhang