Showing papers by "R. Ryf published in 2005"
01 Jan 2005
TL;DR: In this paper, the authors demonstrate the characterization of optical sources with high sensitivity, high temporal resolution, and phase sensitivity using linear optical sampling and reconstruct eye diagrams and constellation diagrams using the interference of the source under test with a train of sampling pulses.
Abstract: We demonstrate the characterization of optical sources with high sensitivity, high temporal resolution, and phase sensitivity using linear optical sampling. Eye diagrams and constellation diagrams are reconstructed using the interference of the source under test with a train of sampling pulses. This concept is implemented using a waveguide optical hybrid, which splits and recombines the sources and adjusts the phase between the recombined signals to provide optimal detection. This diagnostic is used to characterize on-off keyed (OOK) waveforms at rates up to 640 Gb/s and various phase-shift keyed (PSK) signals at 10 and 40 Gb/s.
114 citations
10 Jan 2005
TL;DR: In this article, a channel blocking optical filter is presented for use as a reconfigurable optical add/drop multiplexer (ROADM), which seamlessly supports data rates from 2.5 to 160 Gb/s.
Abstract: This work presents a high-resolution (13.2 GHz) channel-blocking optical filter, suitable for use as a reconfigurable optical add/drop multiplexer (ROADM), which seamlessly supports data rates from 2.5 to 160 Gb/s. The filter consists of a linear array of 64 MEMS micromirrors and a high-dispersion echelle grating. The demonstrated device had an insertion loss of 9 dB, a loss ripple of 1.2 dB, and a group delay ripple of 15 ps. Data transmission through the device with various mixed data rate scenarios ranging from 2.5 to 160 Gb/s showed negligible penalty, except at 40 Gb/s where a maximum penalty of 1.5 dB was observed due to a phase coherence with the blocker filter ripple.
67 citations
06 Mar 2005
TL;DR: The field of ultra high-speed (spl ges/160 Gb/s) transmission has developed rapidly over the past years from proof-of-principle demonstrations towards advanced field trial applications as discussed by the authors.
Abstract: The field of ultra high-speed (/spl ges/160 Gb/s) transmission has developed rapidly over the past years from proof-of-principle demonstrations towards advanced field trial applications. We review recent trends in 160 Gb/s signal generation and detection techniques.
11 citations
06 Mar 2005
TL;DR: A new 160-Gbit/s signal format employing phase inversion of every four consecutive bits in a group enables simple clock recovery by spectral filtering, and increases the nonlinear tolerance compared to CSRZ signals.
Abstract: We propose and demonstrate a new 160-Gbit/s signal format employing phase inversion of every four consecutive bits in a group. This format enables simple clock recovery by spectral filtering, and increases the nonlinear tolerance compared to CSRZ signals.
7 citations
10 Jan 2005
TL;DR: Oversampling in combination with maximum-likelihood estimation-based data processing of the optical-to-electronic converted signal results in a record sensitivity for an optically preamplified receiver.
Abstract: This paper describes the demonstration of a novel method for detecting optical duobinary signals. Oversampling in combination with maximum-likelihood estimation-based data processing of the optical-to-electronic converted signal results in a record sensitivity for an optically preamplified receiver. The concept is investigated at 10 Gb/s and allows data recovery at bit-error rates of 1/spl times/10/sup -9/ and 1/spl times/10/sup -3/ with a receiver sensitivity of better than -39.5 dBm and an optical signal-to-noise ratio (OSNR) of only 7.8 dB, respectively.
3 citations