Depolarized laser diode module and depolarized laser diode light source

摘要

The present invention provides the following designing method: in a laser diode module or a depolarized laser diode module which has one laser diode and one polarization maintaining fiber connected to the output side thereof, the length of the polarization maintaining fiber is a value obtained by calculation of equation 37 with use of a longitudinal mode spacing Deltalambdaoutput light from the Fabry Perot (FP) laser diode, an oscillating center wavelength lambda₀ of the laser light, a beat length L_{Beat 1} of the polarization maintaining fiber and an optical wavelength lambda_Beat used in the measurement of the L_{Beat 1}. (Equation 37) $L_{\mathrm{Pig}}<\frac{{\mathrm{lambda}}_0^2}{\mathrm{Deltalambda}}x\frac{L_{\mathrm{Beat}1}}{{\mathrm{lambda}}_{\mathrm{Beat}1}}$