Edwin Jan Klein - Universiteit Twente

Chapter 9
Discussion and Conclusions
During the four years in which the work presented in this thesis was carried out the
quality and complexity of the microring resonators steadily progressed from single
resonators showing very bad responses (see for instance Figure 6.18) to multiresonator
devices such as the OADM and router presented in Chapter 7 that show
spectra that nearly look like simulations. In this thesis an attempt was made to not
only show the results obtained from the devices that have been fabricated but to also
give most of the tools and information required to continue the work on even more
complex devices.
Normalized dropped power (dB)
0
-5
-10
-15
-20
-25
-30
1538 1540 1542 1544 1546 1548 1550 1552
Wavelength (nm)
Figure 9.1. Response measured at the drop port of a 1550 nm OADM fabricated in
the Vertical II fabrication process.
Regrettably the problems with the fabrication of the router, although resulting in a few
highly interesting devices in the 1300 nm telecom window, caused such a delay
devices that the intended devices, designed to operate at 1550 nm, were not yet