Study of multiwavelength DFB semiconductor laser array with asymmetric structures based on sampling technique

Abstract

Multiwavelength distributed feedback (DFB) semiconductor laser arrays (MLA) with asymmetric structures are studied in this paper. Thanks to the sampling technique, the asymmetric structures, including asymmetric phase shift and asymmetric coupling coefficient, can be achieved by common holographic exposure. Therefore, the cost of fabrication is remarkably reduced. In addition, due to the large scale of the sampling pattern, the wavelength precision of these kinds of MLA can be simultaneously improved. As an example, we designed and fabricated an asymmetrically phase-shifted MLA with 10 wavelengths for the first time. Compared with the common phase-shifted DFB laser, slope efficiency is significantly improved and single longitudinal mode is still guaranteed. Besides, relatively high wavelength precision is also obtained. The proposed MLA configurations may significantly benefit multiwavelength emitters for future photonic integration.

A novel algorithm based on DFB tunable laser array for demodulation of FBG sensors

“…By tuning injection current of DFB laser diode array, wavelengths of each channel of the array can be tuned [12,13]. Based on reconstruction-equivalent chirp (REC) technology and through employing phase shift, we have realized fourchannel tunable laser array with each laser channel's wavelength can be continuously tuned on a large scale [14,15]. The characteristic of the tunable DFB-LD array used in the experiment is shown in Fig.…”