Evaluation of a Laser Diode for DGV Application

This paper will present the evaluation of a 300 mw, continuous wave, laser diode system which appears to be suitable for DGV use. The laser frequency range is sufficiently narrow and the lasing frequency can be adjusted across the range of the iodine reference cell (absorption line filter). A spectrum analyzer is used to document the frequency content of the laser across the frequency range of the iodine reference cell. The response of the iodine reference cell to the laser across its spectrum is measured at several iodine reference cell temperatures. The beam profile is also measured. This set of data determined the applicability of this laser for DGV use.

DFB Lasers with Tilted Waveguide for Multi-Wavelength Generation

In this paper, we present the theoretical investigation of index-coupled distributed feedback (DFB) laser with tilted single mode ridge waveguides. By tilting part of the ridge waveguide in various degrees, DFB laser with manifold effective grating periods can be realized. The structure is analyzed using couple mode theory in matrix form based on threshold analysis. Important parameters of DFB laser like resonant frequency and threshold gains are obtained by solving the eigen-equation. The results indicate not only that the lasing frequency is modulated by the waveguide titling angle, but also large Gain Margin (GM) can be achieved at the threshold condition which enhance the stable single mode operation in index-coupled DFB laser.