William P. Krug

Analysis of the tuning sensitivity of silicon-on-insulator optical ring resonators

High-quality-factor optical ring resonators have recently been fabricated in thin silicon-on-insulator (SOI). Practical applications of such devices will require careful tuning of the precise location of the resonance peaks. In particular, one often wants to maximize the resonance shift due to the presence of an active component and minimize the resonance shift due to temperature changes. This paper presents a semianalytic formalism that allows the prediction of such resonance shifts from the waveguide geometry. This paper also presents the results of experiments that show the tuning behavior of several ring resonators and find that the proposed semianalytic formalism agrees with the observed behavior.

A Hybrid Electrooptic Microring Resonator-Based

Pairing high-quality factor (Q) silicon-on-insulator microring resonators with rapidly tunable organic electrooptic claddings has allowed the first demonstration of a silicon-organic hybrid electrooptic reconfigurable optical add/drop multiplexer (ROADM). A coplanar electrode geometry provides up to 0.36 GHz/V of electrooptic voltage tuning for each channel, corresponding to an electrooptic coefficient of r33 = 64 pm/V at wavelengths around 1550 nm. Individual ring resonator devices have 40- mum ring radii, 2.7-nm free spectral range, and tuning ranges of 180 GHz. The 1 times 4 times1 ROADM has a footprint of less than 1 mm2 and has been shown to reconfigure in less than a microsecond.

1 \times 4\times 1

Recently there has been strong interest in wireless optical (WO) communication link applications in airplanes and avionics platforms for size, weight, power, cost, and electromagnetic interference (EMI) reduction. Wireless optical link has additional advantage of providing network security because the optical signal from wireless optical link is well confined within an airplane or avionics vehicle. In this paper we discuss some potential wireless optical link applications in commercial airplanes and the challenges in the implementation of wireless optical links for these applications. We will present our experimental results on using white LED (WLED), visible laser source and free-space small-form-factor (SFF) optical transceivers to demonstrate the viability of applying wireless optical links in avionics platforms.

ROADM for Wafer Scale Optical Interconnects

We presented a low cost experimental WLED transceiver which is capable to perform wireless communication at 10 Mb/s in an airplane or a space craft physical environment. From the experimental results, we derived the operational requirements of the WLED transceiver with OOK NRZ modulation. These results demonstrate the WLED wireless communication link technology is viable for size, weight, power and cost reduction in future generation of airplanes and space vehicles.

Wireless optical links for avionics applications

Recently there has been strong interest in wireless white LED (WLED) communication link applications in airplanes and avionics platforms for size, weight, cost, and electromagnetic interference (EMI) reduction. Wireless WLED link has additional advantage of providing network security because the optical signal from WLED link is well confined within an airplane or avionics vehicle. In this paper we discuss and analyze commercial-off-he-shelf WLED design and color measurement results. An experimental implementation of a low cost WLED transceiver which shows error free freespace operation at 10Mb/s is successfully demonstrated. The feasibly of implementing free space optical link which meets both lighting and communication requirements using WLED array is analyzed by mathematical modeling using MATLAB simulation technique.