A high-speed low-drive-voltage travelling wave electrodes InGaAsP-InP phase modulator operated at 1.55 μm is demonstrated. The modulator is fabricated using a multiple quantum-well optical waveguide with an on chip integrated termination resistor. A small signal bandwidth of 35 GHz and a V/spl pi/ of 1.8 V has been demonstrated.

Highly versatile building blocks for polarization-mode dispersion (PMD) emulation and compensation are demonstrated using tunable all-pass filters fabricated in 4%-index-contrast planar waveguides. While the all-pass filters can approximate any phase response, the complexity in setting the individual filter parameters is minimized by restricting the all-pass filter responses to realize a range of differential delays, dispersion, and dispersion slope. A single section can approximate first-order or a higher-order PMD term or emulate chromatic or higher-order dispersion. A differential group delay (DGD) tuning range over 100 ps is demonstrated for 10 Gb/s and 25 ps for 40 Gb/s data. Second-order PMD with a tuning range of 255 ps/sup 2/ and third-order PMD with a range of 2430 ps/sup 3/ are also demonstrated. The larger index contrast required for the ring-resonator-based all-pass filters is advantageous in reducing the thermooptic response time to achieve polarization rotation speeds on the order of 0.1 /spl mu/s/degree. The device is interferometrically stable and compact in size. It can be fully integrated, scaled to many sections, and can implement a variety of PMD synthesis and statistical-emulation approaches.

A high-speed low-drive-voltage travelling wave electrodes InGaAsP-InP phase modulator operated at 1.55 m is demonstrated. The modulator is fabricated using a multiple quantum-well optical waveguide with an on chip integrated ter- mination resistor. A small signal bandwidth of 35 GHz and a V of 1.8 V has been demonstrated.

An endless, reset-free polarization controller implemented with planar lightwave circuits using phase shifters for tuning is proposed and demonstrated. By avoiding the need for tunable polarization mode converters, simple fabrication processes and a large range of material systems can be used, since neither the electrooptic effect nor a rotatable birefringence axis are necessary for device operation. The proof of concept is demonstrated by implementing the equivalent of a rotating waveplate using Ge-doped silica-on-silicon waveguides; and thermooptic phase shifters. The polarization controller is shown to have excellent tolerance to fabrication variations. Fast thermooptic control (on the order of 10 kHz) is achieved using high-index-contrast (4%) waveguides.

A record sensitivity of -36.2 dBm at 1552.5-nm wavelength (45 photons/bit) is reported for an optically preamplified receiver operating at 42.7 Gb/s. The transmission format is return-to-zero differential phase-shift keying. The receiver employs a delay-interferometer demodulator followed by balanced-photodiode detection and electronic demultiplexing to 10.7 Gb/s.

A novel scheme for a digitally tunable laser requiring only P+Q+1 optical amplifiers for a device with in total P×Q wavelength channels is presented. A 32-channel InP/InGaAsP based device is fabricated. An optimised active layer and low on-chip losses result in a high optical output power.

Eighty-nine 42.7 Gbit/s, 100 GHz-spaced WDM channels in a 72 nm seamless band were transmitted over 40 x 100 km of fibre using carrier-suppressed return-to-zero differential-phase-shift-keyed modulation format with a balanced receiver, all-Raman amplification, a broadband dynamic gain equaliser and a zero-dispersion discrete Raman amplifier.

We report the first transmission of copolarized 40-Gb/s channels with 0.8-b/s/Hz spectral efficiency. We transmit 25 channels over 1200 km of nonzero-dispersion fiber (1600 km with adjacent channels orthogonally polarized). This result was obtained using differential phase-shift keying, and without forward error correction.

A receiver with an electrical decision feedback equaliser for data recovery of a 20 Gbit/s polarisation multiplex signal is demonstrated.

A new reflective configuration for a monolithically integrated channel selector with power monitor is proposed. One star coupler, one arrayed waveguide grating, and a minimum number of semiconductor optical amplifier (SOA) gates are used to achieve loss-free transmission. A 32-channel device controlled by only 12 SOA gates is realized in InP. Low on-chip losses result in strongly reduced bias currents and an improved signal to noise ratio compared to previously demonstrated devices. The use of SOAs allows for switching on a nanosecond time scale.

The limitations imposed by the frequency standards on the performance of N/spl times/N arrayed waveguide gratings (AWGs) are reviewed for different device layouts. An improved design that allows for an enhanced frequency accuracy of the transmission response of the device is presented and experimentally verified. The maximum deviation from the frequency standards is reduced by almost a factor of two in a 32 /spl times/ 32 AWG with 100 GHz channel spacing.

We present an integrated-optics device that switches any of eight wavelengths from one input fiber to any of nine output fibers with <7 dB loss. Its features are suitable for mass production: use of standard silica waveguides, double-rejection switching and filtering for all paths, and compactness.

PMD and chromatic dispersion emulator and compensator architectures using allpass filters are presented. The tuning range and bandwidth for 10 and 40 Gb/s using planar waveguide ring resonators with 75 GHz FSR are discussed.

The limitations imposed by the frequency standards on the performance of N x N arrayed waveguide gratings (AWGs) are reviewed for different device layouts. An improved design that allows for an enhanced frequency accuracy of the transmission response of the device is presented and experimentally verified. The maximum deviation from the frequency standards is reduced by almost a factor of two in a 32 x 32 AWG with 100 GHz channel spacing.

We demonstrate a 1.2 Tb/s optical packet switch fabric based on burst-mode clock-data-recovery at 40 Gb/s with packet separations of up to 400 ns and lock times under 5 ns. fast wavelength switching between 32 channels in less than 46 ns. and a 42x42 AWG with a worst-case loss of 4.2 dB.

3.08Tbit/S (77 x 42.7 Gbit/s) WDM transmission over 1200 km fibre with 100 km amplifier spacing and 100 GHz channel spacing is demonstrated. Error-free transmission of all 77 channels is achieved by employing dual C- and L-band hybrid Raman/erbium-doped inline amplifiers, experimental low dispersion slope TrueWave (R) fibre, and forward error correction.

We present an 80-channel drop filter based on planar waveguide silicon optical bench technology that accesses independently each channel. This approach offers design simplicity, robustness, size and cost reduction. Flat-top passbands and negligible chromatic dispersion are included features.

A four-node dynamically reconfigurable optical network, using integrated add/drop devices, is demonstrated. Aggregate capacity of 1.6 Tbit/s (40 × 40 Gbit/s), spectral efficiency of 0.4 bit/s/Hz, Q values > 18 dB and wide tolerance to wavelength misalignment are key results.