A clock generation circuit for a transmitter which transmits data according to an output clock signal is provided. The method includes: obtaining monitoring information of an Optical Line Terminal and an Optical Network Unit ; and determining a failure of a passive ONU according to the obtained monitoring information of the OLT and the ONU. The switch assembly provides actuators that interface with non-contact sensors in the switch interface. The cooling fluid cools the RF coils to improve imaging of the sample. Using the LFVR in place of a conventional silicon diode rectifier in the secondary of a flyback converter reduces average power dissipation and increases power supply efficiency. More particularly, embodiments of the present invention provide an edge ring having one or more fins formed on an energy receiving surface of the edge ring.