Abstract
When butt coupling a Fabry–Perot laser diode to an extremely
closely spaced waveguide (separation less than or equal to a few
times the Rayleigh range of the laser beam), there is a trade-off
between the optimal power coupling and the variation of the coupled
laser diode’s operational characteristics. Changes in the
butt-coupling configuration parameters influence the coupling
efficiency, as well as the strength of the feedback into the laser
diode. Using a previously reported phenomenological model that
treats the butt-coupled laser diode as an extremely short
external-cavity (ESEC) device, we quantitatively describe how the
butt-coupling parameters can be used to control the output power,
threshold current, wavelength, and relative intensity noise of the ESEC
laser diode. Our analyses are supported by experimental
results. The importance of choosing the correct coordinate plane
for evaluation of the overlap integrals that are used in the model is
also discussed.
© 1998 Optical Society of America
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