Abstract

Narrow bandpass filters (NBP) have historically been made of layers which are a quarter wave optical thickness (QWOT) at the passband wavelength, and each layer has been monitored by terminating at the turning points (TPs) of those layers as illustrated in Fig. 1. Studies[1-3] have shown the benefits of terminating well beyond those TPs as shown in Fig. 2. This gives an advantage of making the layer cuts where the slope of the %T with increasing thickness is larger than at the TP, where it is zero. The preferred strategy is to make the terminations at a certain Percentage down or up from the previous Optical Extrema (TP) in the Monitoring trace (POEM). The companion paper at this conference demonstrates that this strategy generally gives better results than TP monitoring strategies.

© 2013 Optical Society of America