Thermal Response Analysis of a Tunable Laser Diode Using a Mode Density Method

Mitsuteru ISHIKAWA, Hiroyuki ISHII, Yuzo YOSHIKUNI

Summary :

The thermal response of a tunable laser is analyzed by using a mode density method based on a Fourier-Laplace analysis. This method introduces a mode density function for mode distribution of the Fourier-Laplace transform and gives temperature time-dependency in an integral form instead of an infinite weighted summation. When symmetric structures are assumed, the mode density method gives the transient thermal response in a simple form: error functions (spherical-symmetry case) and exponential integral functions (cylindrical-symmetry case). The cylindrical-symmetry analysis was extended to the noncylindrical-symmetry model and the thermal response of the tunable laser was calculated by the mode density method. The result shows good agreement with a Fourier-Laplace analysis (deviation 2%) and experimental results. As a rough estimation, the thermal response of the laser is in proportion to the logarithm of time in some range that depends on the chip and tuning-section size of the laser.

• Publication: IEICE TRANSACTIONS on Electronics Vol.E85-C No.1 pp.85-92
• Publication Date: 2002/01/01
• Type of Manuscript: Special Section PAPER (Special Issue on Recent Progress in Semiconductor Lasers and Light-Emitting Devices)

Authors

Mitsuteru ISHIKAWA
Hiroyuki ISHII
Yuzo YOSHIKUNI

Keyword

tunable laser diodes,  thermal response,  mode density,  numerical calculation,  Fourier analysis