Abstract
To eliminate one of the main noise sources in an optical telecom
link, it is necessary to protect the lasers from optical feedback by including
an optical isolator in the laser diode package. With today’s commercial
bulk isolators the packaging of a laser diode module represents the
largest part in the cost of the module. An isolator that can easily be integrated
with its source is therefore highly desirable. A promising scheme
consists of an amplifying waveguide covered with a magnetized ferromagnetic
metal. Earlier, we demonstrated this concept experimentally. Here we
report on the optimization of the isolator. Magneto-optic waveguide calculations
revealed a subtle interplay between the waveguide dimensions, the
cladding material and the properties of the metal film. Our experimental
result of 12.7dB optical isolation combined with full compensation of the
internal loss is the best ever obtained. With this performance practical implementation
is now within reach. Related Projects
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