A 8-Skip-0 WDM Filter

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An 8-skip-0 WDM filter is capable of adding or dropping 8 channels of a 100-GHz spacing fiberoptic telecommunication system. The design we present has the following specifications: centered at 1550 nm, passband width of 6.0 nm at the -0.5 dB (about 89%) transmission level, bandwidth of 6.8 nm at the -25 dB (about 0.3%) transmission level, 0.1% ripple in the passband materials H (index 2.065) and L (index 1.47) TFCalc 3.5 has the capability of designing narrow bandpass (NPB) filters using the prototype method. To obtain the steep edges required in this design, we used 13 cavities. After a few minutes, TFCalc produced a design whose performance is shown below. The design's width at the -25 dB level is 6.7 nm, which is better than required. The stack formula for this 303-layer design is HLHLHLHL 3H 2L HLH 3L HLHLHL 3H LHLHLHL 3H LH 2L HLHLHLH 3L HLH 3L HLHLHLH 3L HL 3H 2L 3H LHLHLH 3L HLH 3L HLHLH 3L HLHL 3H 2L H 3L HLHLHLH 3L H 3L HLHLHLHLH 3L 3H 2L 3H LH 3L HLHLHLH 3L HLHLH 3L HLHL 3H 2L 3H LHLHLHLHLH 3L HLH 3L HLHL 3H L 3H 2L 3H L 3H LHLH 3L HLH 3L HLHLHLHLHL 3H 2L 3H LHLH 3L HLHLH 3L HLHLHLH 3L HL 3H 2L 3H 3L HLHLHLHLH 3L H 3L HLHLHLH 3L H 2L 3H LHLH 3L HLHLH 3L HLH 3L HLHLHL 3H 2L 3H LH 3L HLHLHLH 3L HLH 3L HLHLHLH 2L HL 3H LHLHLHL 3H LHLHLH 3L HLH 2L 3H LHLHLHLH

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