Fiber-optic links are attractive for transmitting microwave/millimeter wave signals for applications such as radar,
imaging and astronomy. However, current fiber-optic links that employs intensity modulation and direct detection suffer
from limited spurious free dynamic range (SFDR). For solution, a new coherent fiber-optic link using linear phase
modulation/demodulation has been proposed. The new link should be able to achieve an SFDR two orders of magnitude
higher. The key for this link is an Optical Phase Locked Loop (OPLL) linear phase demodulator. In this paper we
describe the design and preliminary measurements for the first generation ACP-OPLL photonic integrated circuits.
Current IP/ATM routers use an electrical switching fabric/backplane and either optical or electrical interconnects between the line cards to route data. An electrical backplane and associated connectors limit the number of high speed interconnections due to practical considerations. Scaling these so-called third generation routers to the terabit regime with high port densities faces enormous problems due to the high interconnect and electrical power density. Packet routers with an optical switching fabric are considered as the next generation of IP/ATM Multi-Service routers which enable scalability towards the Terabit and Petabit regime. In this paper, various architectures with electrically active or passive optical switch fabrics will be highlighted and differences in terms of switching speed and scalability will be discussed. Recent results using a passive Array Waveguide Grating (AWG) router and fast wavelength tunable laser are presented in the second half of this paper.
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