title: High channel count and high precision channel spacing multi-wavelength laser array for future PICs.
abstract: Multi-wavelength semiconductor laser arrays (MLAs) have wide applications in wavelength multiplexing division (WDM) networks. In spite of their tremendous potential, adoption of the MLA has been hampered by a number of issues, particularly wavelength precision and fabrication cost. In this paper, we report high channel count MLAs in which the wavelengths of each channel can be determined precisely through low-cost standard μm-level photolithography/holographic lithography and the reconstruction-equivalent-chirp (REC) technique. 60-wavelength MLAs with good wavelength spacing uniformity have been demonstrated experimentally, in which nearly 83% lasers are within a wavelength deviation of ±0.20 nm, corresponding to a tolerance of ±0.032 nm in the period pitch. As a result of employing the equivalent phase shift technique, the single longitudinal mode (SLM) yield is nearly 100%, while the theoretical yield of standard DFB lasers is only around 33.3%.
authors.affiliation: National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Microwave-Photonics Technology Laboratory, Nanjing University, Nanjing, 210093, China.
authors.forename: Yuechun
authors.initials: Y
authors.lastname: Shi
authors.affiliation: 1] National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Microwave-Photonics Technology Laboratory, Nanjing University, Nanjing, 210093, China [2] School of Engineering, University of Glasgow, Glasgow G12 8QQ, U.K.
authors.forename: Simin
authors.initials: S
authors.lastname: Li
authors.affiliation: National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Microwave-Photonics Technology Laboratory, Nanjing University, Nanjing, 210093, China.
authors.forename: Xiangfei
authors.initials: X
authors.lastname: Chen
authors.affiliation: 1] National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Microwave-Photonics Technology Laboratory, Nanjing University, Nanjing, 210093, China [2] Photonics Research Group, Department of Information Technology (INTEC), Ghent University, Sint-Pietersnieuwstraat 41, 9000 Ghent, Belgium.
authors.forename: Lianyan
authors.initials: L
authors.lastname: Li
authors.affiliation: Microelectronic Research Center, Department of Electrical Engineering, The University of Texas at Austin, Austin, Texas 78758, USA.
authors.forename: Jingsi
authors.initials: J
authors.lastname: Li
authors.affiliation: National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Microwave-Photonics Technology Laboratory, Nanjing University, Nanjing, 210093, China.
authors.forename: Tingting
authors.initials: T
authors.lastname: Zhang
authors.affiliation: National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Microwave-Photonics Technology Laboratory, Nanjing University, Nanjing, 210093, China.
authors.forename: Jilin
authors.initials: J
authors.lastname: Zheng
authors.affiliation: National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Microwave-Photonics Technology Laboratory, Nanjing University, Nanjing, 210093, China.
authors.forename: Yunshan
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Microwave-Photonics Technology Laboratory, Nanjing University, Nanjing, 210093, China.
authors.forename: Song
authors.initials: S
authors.lastname: Tang
authors.affiliation: School of Engineering, University of Glasgow, Glasgow G12 8QQ, U.K.
authors.forename: Lianping
authors.initials: L
authors.lastname: Hou
authors.affiliation: School of Engineering, University of Glasgow, Glasgow G12 8QQ, U.K.
authors.forename: John H
authors.initials: JH
authors.lastname: Marsh
authors.affiliation: Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China.
authors.forename: Bocang
authors.initials: B
authors.lastname: Qiu