Exposed-core single-mode-fiber channel-dropping filter using a high-index overlay waveguide.

Using the coupling between a standard single-mode fiber and single higher-order modes in a high-index overlay waveguide, we demonstrate a wavelength-filtering device with a channel-dropping response. Two types of filter are described. One uses a thin overlay waveguide, giving a single tunable dropped band response in the 1.2-1.6-microm wavelength region with rejection greater than 20 dB and an insertion loss of about 0.5 dB. The other uses a thick overlay waveguide and gives a comb-filter response with a dropped channel spacing of 13 nm with 20-dB rejection and an insertion loss of between 1 and 4 dB.

Wavelength-selective filters for single-mode fiber WDM systems using Fabry-Perot interferometers.

The applications of the Fabry-Perot interferometer to high capacity wavelength division multiplexed optical systems are discussed. The performances of several practical embodiments, their anticipated role and ultimate performance limitations are described.

Optimization of thick lenses for single-mode optical-fiber microcomponents.

A technique is presented that allows the lengths of thick miniature lenses to be controlled with great accuracy, yielding low-loss micro-optic connectors and components for single-mode fiber systems. A comparison between a simple model of the performance of the lens assemblies and the experimental results produces a close correlation.