Abstract
Optical filters are crucial devices for wavelength channel selecting in
wavelength-division-multiplexed fiber-optic communication networks.
Measuring the inner physical parameters of optical filters is significant
for analyzing emerging new and more complex structures. This paper proposed
a general and easy-to-operate method to extract physical parameters for
complex filter structures with optical low-coherence measurement. By
treating optical filters with digital filter concepts and z-transform analysis, we can build the
relation between interferogram peak values and transfer function
coefficients with brief linear equations. These equations can be used to
derive the exact expression of transfer functions, which can manipulate the
physical parameters. For a given filter structure, according to relations
between transfer functions and physical parameters, the physical parameters
could be extracted. This is especially meaningful in the postfabrication
process.
© 2011 IEEE
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