A novel micro-bridge actuator that can satisfy the important requirements for optical switching has been designed,
fabricated and tested. These important properties of the actuator include bi-stability, large out-of-plane movement, bi-directionality
and electro-thermal actuation. The monolithic integration of a micro-mirror with this actuator is critical
to demonstrate its application for optical switching in planar light circuits. In this paper, the design, simulation,
fabrication and testing of the integrated system will be presented. The design and simulation issues include (i)the
design of the micro-mirror that can be integrated and yet maintain the bi-stability behavior of the micro-bridge (ii)
ANSYS simulations to substantiate the design (iii) the design of the dimensions of the mask lay-out of the micro-mirror
to provide the desired micro-mirror size on the micro-bridge. The integrated system was fabricated on (110)
oriented wafer. A vertical flat mirror, with verticality of 89.5° and a roughness of about 10nm has been obtained. The
fabricated optical switch is laser diced, packaged, wire-bonded and tested. A free space optical path is established by
micro-positioning optical fibers on the surface of the wafer in etched grooves to demonstrate optical switching. The
optical system is actuated between the ON and OFF positions by driving 16mA and 10mA currents through the legs
and bridge parts of the micro-bridge for respectively.
Diamond has a range of extraordinary properties and the recent ability to produce high quality synthetic diamond has
paved the way for the fabrication of practical diamond devices. This paper details the recent progress in the fabrication of
waveguide structures in diamond which are desirable as the basis for quantum key distribution (QKD), quantum computing and high-power, high speed microwave chips. The diamond ridge waveguide structures are produced by photolithography and reactive ion etching (RIE) with some additional processing with a focused ion beam (FIB). The processes currently used are discussed along with experimental results. Future fabrication goals and potential methods for achieving these goals are also presented.
Pole-zero diagrams are often employed in electronic filter design because of their simple and direct visualization of spectral characteristics. This paper proposes the use of pole-zero diagrams for tailoring the spectral response of ring resonator array filters for photonic applications. We show that there exist close relations between the pole-zero diagram features of the resonator array and its wavelength response characteristics, and demonstrate that the pole-zero diagram approach could be a very useful tool in the design of photonic devices based on resonator filters. In particular, we employ the pole-zero diagram approach for the case of a parallel-coupled ring resonator array for interleaving, and use this method to produce a new low crosstalk design.
Optical ring-resonators could be used to synthesize filters with low crosstalk and flat passbands. Their application to DWDM interleaving has been proposed and investigated previously. However, a number of important factors related to this topic have not yet been considered and appropriately addressed. In this paper, we propose a novel scheme of a symmetrically parallel-coupled ring resonator array with coupling apodisation. We show that it can be used to construct a wavelength interleaver with remarkably improved performance. Various design factors have been considered. An optimization procedure was developed based on minimizing the channel crosstalk in the through and drop ports simultaneously by adjusting the ring-bus coupling coefficients. We show that apodisation in coupling could suppress channel crosstalk effectively, by choosing the optimal coupling coefficients. We also introduced the equalization of both the input and output coupling coefficients to minimise passband ripple. For a 50 - 100 GHz DWDM applications, four rings is found to be the best choice for array size. A four-ring filter achieves crosstalk -24 dB, insertion loss at resonance <1 dB, and good passband flatness (shape factor >0.6).
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.