Densely integrated microroring-resonator based components for fiber-to-the-home applications


Klein, Edwin Jan (2007) Densely integrated microroring-resonator based components for fiber-to-the-home applications. thesis.

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Abstract:The design, realization and characterization of densely integrated optical components based on thermally tunable microring resonators fabricated in Si3N4/SiO2 is described. Current copper based networks are unable to meet future bandwidth demands and will therefore be slowly replaced with optical networks. A promising technology for these networks is WDM-PON. Currently, however, this technology is too expensive. The Broadband Photonics and NAIS projects within which the presented work was carried out both seek to lower the cost of WDM-PON implementations through dense integration of reconfigurable optical components based on optical microring resonators.

A number of realized designs, all based on a basic resonator building block are discussed. This building block is based on a 2.0 x 0.14 µm port waveguide from where the light is coupled into a tunable ring resonator that has waveguide dimensions of 2.5 x 0.18 µm and a radius of 50 µm. Amongst the less complex realized devices is a wavelength selective optical switch based on two cascaded resonators. The switch measures only 200 µm x 200 µm. The “on/off” attenuation of the switch is 12 dB. When the switch is “on” the crosstalk with the adjacent channels is ≈-20 dB (channel spacing of 0.8 nm).
In addition more complex devices have been realized. The characterization of two different types of OADM, for use at 1310 nm or at 1550 nm, and a Router are discussed. The 1550 nm OADM could be fully tuned and could be configured to drop one or more channels. In addition system level measurements were performed in this OADM. A 40 Gbit/s could be dropped to a single channel without a significant penalty in BER. In addition multicasting was demonstrated. The same reconfigurability was also shown for the 1300 nm OADM. Finally the 1300 nm router is discussed and basic functionality of the router, dropping one, two or three channels to a single output is demonstrated.
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Metis ID: 245981