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We demansuate GaAs integration of an encoder for aotical DOPSK transmission. Exoeriments demohrate ap'plication to dispersion-tolerant 10 Gbls transmission over an uncompensated fiber span up to 250 km, and high spectral efficiency 20 Gbls transport. e:.=

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The market for Information technology and wireless communication systems is growing rapidly to meet the increasing demand for more capacity on existing networks and new systems with greater bandwidth. Access points to these networks are moving closer to individual desks and homes, driving up the volumes, and driving down the prices, of the required components. GaAs MMIC technology is ideally placed to meet these requirements, bringing with it small size and weight, low cost and inherent reproducibility. The MESFET. HEMT and HBT W I C processes at GMMT have produced .4SICs for commercial products in such systems, and are available as foundry services for external customers to design their own ASIC chips.