A.J. Bruce

An all-pass filter dispersion compensator using planar waveguide ring resonators

A compact, multichannel dispersion-compensating filter is demonstrated with D=/spl plusmn/4200 ps/nm, a /spl plusmn/5 ps group delay ripple, low loss, a 4.5-GHz passband, and the design to compensate for higher-order dispersion.

Gain flatness of a planar optical waveguide amplifier

We report on the broad gain and gain flatness spectra (1530-1565 nm) of a 14 cm long Er/sup 3+/ doped aluminosilicate waveguide amplifier pumped at 1470 nm. We demonstrate its successful use as an in-line amplifier in an 8 channels WDM 155 Mbit/s transmission fiber experiment.

Integrated planar waveguide amplifier with 15 dB net gain at 1550 nm

A packaged Er-doped aluminosilicate planar optical waveguide amplifier (POWA) has shown net gain of 15 dB (22 dB) at 1550 nm (1532 nm) with 150 mW/980 nm pump. Low loss (0.25 dB) mode converters that couple between the POWA and standard P-glass waveguides are also demonstrated.

A multi-port add/drop router using UV-induced gratings in planar waveguides

A low-loss, reconfigurable add/drop multiplexer that can route channels between two fibers is presented. Hitless switching is demonstrated on a two-channel device with signals and switching times <500 /spl mu/s.

Erbium-doped planar waveguide amplifiers integrated with silica waveguide technology

Summary form only given. We addressed the main challenges of integration of high refractive index Er-doped aluminosilicate waveguides with silicon optical bench technology. Performance of waveguide amplifiers integrated with pump/signal WDM will be presented, and issues related to their integration will be discussed.

Bandpass filter demonstration using all-pass filter decomposition and ring resonators

Elliptic filters are optimum in the sense of providing the most ideal bandpass response, i.e. the most square response, for a given passband and stopband ripple and with the fewest number of stages; consequently, they are very attractive for (de)multiplexing and add/drop applications in WDM systems. Recently, a new optical architecture based on all-pass filter decomposition was described in theory which can exactly realize elliptic filters as well as other designs such as the Butterworth and Chebyshev. The first experimental demonstration of this architecture is reported using planar waveguide ring resonators.

Phase engineering applied to integrated optical filters

Optical filters are an enabling technology for high density, high bitrate WDM systems. Filters are required for a wide variety of tasks including (de)multiplexing channels, gain equalization and dispersion compensation. As the number of channels, utilized bandwidth of the fiber, spectral efficiency, and bitrate per channel increase, the demand for high performance, compact filters with greater functionality and integration increases. Optical allpass filters are compact and easily fabricated in planar waveguides, offer new functionality such as dispersion compensation, and yield more efficient architectures (i.e. fewer stages) for realizing bandpass filters.

Integrated optics for WDM

It is clear that WDM has arrived, that the trend is to more and more wavelengths, and that integrated optical components are going to be critical to future system developments. The opportunities and challenges for these devices will be discussed.