Abstract
By implanting nonreciprocal phase shifts (NPS) into a ring-coupled Mach–Zehnder
interferometer (RCMZI) structure, wavelength-selective isolation can be obtained
over a wideband range. Different transmission lineshapes and structures of
the nonreciprocal RCMZI were examined to meet the requirements of multiwavelength
usage. It was demonstrated that a multiwavelength isolation with wideband
and high-peak isolation could be achieved with just a reciprocal ring-coupled
arm and a nonreciprocal linear arm in a MZI structure. For 5% ring loss per
loop, the ring power coupling ratio $\kappa$ has a tolerance of 0.06 to keep the 30-dB isolation band wider
than 0.3 $\times$ FSR.
Also, an isolator over C-band was designed to verify the feasibility and discuss
the wavelength-dependence issues.
© 2008 IEEE
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