Design and Analysis of a Novel 25 GHz Interleaver for DWDM Applications with Two Ring Configurations

Table 1

The characteristics comparison of interleaver systems.

Characteristics	System type
	Lee et al. [6]	Lee et al. [12]	Hsieh et al. [9]	This work
Filter channel spacing	25 GHz	25 GHz	50 GHz	25 GHz
Structure technique	Sagnac interferometer and ring cavity	Ring cavity	Gires-Tournois etalons	Two-ring cavity
Channel isolation (dB)	45	>36	30	95
0.5 dB passband (nm)	0.182	>0.145	0.35	0.156
25 dB stopband (nm)	0.155	>0.145	0.32	0.173
Flat-top ripple (dB)	<10^−3	~10^−3	NA	0.227 × 10^−9