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The authors describe a new deterministic algorithm for endless reset-free polarization control (PC) based on sequences of tunable phase shifters and directional couplers, which can be implemented in a variety of discrete (e.g., rotating waveplates) and integrated optic material platforms. They provide a novel quantitative formulation of what endless reset-free PC operation means and prove in a rig...Show More
Reset-free integrated polarization controller using phase shifters
C.K. Madsen;P. Oswald;M. Cappuzzo;E. Chen;L. Gomez;A. Griffin;A. Kasper;E. Laskowski;L. Stulz;A. Wong-Foy
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 operati...Show More
Analysis of scalable PMD compensators using FIR filters and wavelength-dependent optical power measurements
Journal of Lightwave Technology
Cited by: Papers (9)
We investigate the potential of optical n-stage FIR filter architectures for PMD compensation (PMDC) based on frequency-dependent optical power monitoring. The measurement information is used to partially estimate the channel's Jones matrix U(/spl omega/), and the filter parameters are adjusted based on solving a nonlinear least-squares problem which mimics the approximate inversion of U(/spl omeg...Show More
This paper starts a systematic study of capacity-achieving (c.a.) sequences of low-density parity-check codes for the erasure channel. We introduce a class A of analytic functions and develop a procedure to obtain degree distributions for the codes. We show various properties of this class which help us to construct new distributions from old ones. We then study certain types of capacity-achieving...Show More
Capacity-achieving sequences for the erasure channel
Proceedings. 2001 IEEE International Symposium on Information Theory (IEEE Cat. No.01CH37252)
Year: 2001 | Conference Paper |
Cited by: Papers (3)
This paper starts a systematic study of capacity-achieving sequences of low-density parity-check codes for the erasure channel. We introduce a class A of analytic functions, show various useful properties of it, and develop a procedure to obtain degree distributions for the codes. We then study certain types of capacity-achieving sequences and introduce new measures for their optimality. For insta...Show More
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