The design of a multi-channel (M = 5) lattice form band pass optical delay line filter is reported. The filter synthesis is based on the division of total transfer function into unit blocks and the circuit parameters are obtained by constrained least square method. This band pass filter has better performance compared with the results obtained in the conventional design techniques. For a filter of order 35, a stop band attenuation greater than 50dB is achieved. Further, the band pass filter is introduced in a optical fiber link and simulated in Optisystem software, to verify its characteristics.
1. Jinguji, K. and T. Yasui, "Synthesis of one-input M-output optical FIR lattice circuits," Journal of Lightwave Technology, Vol. 26, No. 7, 853-866, April 1, 2008. doi:10.1109/JLT.2007.911116
2. Azam, S., T. Yasui, and K. Jinguji, "Synthesis of 1-input 3-output optical delay-line circuit with IIR architectures," Recent Patents on Electrical Engineering, Vol. 1, 214-224, August 2008.
3. Jinguji, K. and M. Kawachi, "Synthesis of coherent two-port lattice-form optical delay-line circuit," Journal of Lightwave Technology, Vol. 13, No. 1, 73-82, January 1995. doi:10.1109/50.350643
4. Benvenuti, L. and L. Farina, "The design of fiber optic filters," Journal of Lightwave Technology, Vol. 19, No. 9, 1366-1375, September 2001. doi:10.1109/50.948284
5. Lenz, G., B. J. Eggleton, C. K. Madsen, and R. E. Slusher, "Optical delay lines based on optical filters," IEEE Journal of Quantum Electronics, Vol. 37, No. 4, 525-532, April 2001. doi:10.1109/3.914401
6. Azam, S., T. Yasui, and K. Jinguji, "Synthesis of 1-input 3-output lattice-form optical delay-line circuit," IEICE Transaction on Electronics, Vol. E90-C, No. 1, 149-155, January 2007. doi:10.1093/ietele/e90-c.1.149
7. Wang, Q. J., Y. Zhang, and Y. C. Soh, "Flat-passband 3 × 3 interleaving filter designed with optical couplers in lattice structure," Journal of Lightwave Technology, Vol. 23, No. 12, 4349-4361, December 2005. doi:10.1109/JLT.2005.854041
8. Jinguji, K. and T. Yasui, "Design algorithm for multichannel interleave filters," Journal of Lightwave Technology, Vol. 25, No. 8, 2268-2276, August 2007. doi:10.1109/JLT.2007.901346
9. Azam, S., T. Yasui, and K. Jinguji, "Synthesis of a multichannel lattice-form optical delay-line circuit," Optik, Vol. 121, 1075-1083, Elsevier, 2010.
10. Selesnick, I. W., M. Lag, and C. S. Bums, "Constrained least square design of FIR filters without specified transition bands," IEEE Transaction on Signal Processing, Vol. 44, No. 8, 1878-1892, August 1996. doi:10.1109/78.533710
11. Madsen, C. K. and J. H. Zhao, Optical Filter Design and Analysis, Wiley-Interscience Publication, John Wiley & Sons, Inc., 1999.