Author details
G. Lenz
Affiliation
Lucent Technologies
Murray Hill
NJ, USA
Biography
G. Lenz, photograph and biography not available at the time of publication.(Based on document published on 7 August 2002). Author's Published Works
Author details
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Optical delay lines have some important applications, notably in optical communication systems and in phased arrays. These devices are based on the concept of optical group delay, which, in turn, can be understood as the property of an optical filter. Optical filters are well-understood devices and, in particular, their dispersive properties determine the group delay response. We review these disp...Show More
Efficient wide-band and tunable midspan spectral inverter using cascaded nonlinearities in LiNbO3 waveguides
M.H. Chou;I. Brener;G. Lenz;R. Scotti;E.E. Chaban;J. Shmulovich;D. Philen;S. Kosinski;K.R. Parameswaran;M.M. Fejer
We report on efficient (-7-dB fiber-to-fiber), wide-band (over 70 nm), tunable, and excess-noise-free mid-span spectral inverters based on cascaded second-order nonlinearities in periodically poled LiNbO/sub 3/ waveguides. We demonstrate their performance in a 4/spl times/10 Gb/s transmission over 150 km of standard single-mode fiber.Show More
Strong Bragg gratings in chalcogenide glass waveguides
S. Spalter;H.Y. Hwang;J. Rogers;T. Katsufuji;G. Lenz;S.-W. Cheong;R.E. Slusher;A. Kelsey;B. MacLeod
Summary form only given. Recently, chalcogenide glasses have generated much interest because of Kerr nonlinearities, which can be up to 600 times higher than in silica glass at the 1.55-/spl mu/m communication wavelength. Possible applications include low peak power, ultrafast all-optical switching using waveguide lengths of only a few centimeters embedded in a photonic circuit. Bragg gratings tak...Show More
Summary form only given. Recently microstructure optical fibers with large air-fill fractions were demonstrated with zero group-velocity dispersion at /spl sim/770 nm. Experimentally these fibers appear to be single-mode over long propagation lengths at wavelengths ranging from 500 nm to 1550 nm. As a result of the unusual dispersion characteristics and mode properties of the microstructure fiber,...Show More
A multi-channel dispersion slope compensating optical allpass filter
A multi-channel dispersion slope compensating filter based on a Gires-Tournois interferometer with a specially designed thin-film filter is presented. The allpass filter has low loss, and negligible birefringence.Show More
Erbium-doped planar waveguide amplifiers integrated with silica waveguide technology
J. Shmulovich;D.J. Muehlner;A.J. Bruce;J.-M. Delavaux;C. McIntosh;G. Lenz;L.T. Gomez;E.J. Laskowski;A. Paunescu;R. Pafchek;I. Ryazansky;S.G. Kosinski;A.E. White
Summary form only given. We addressed the main challenges of integration of high refractive index Er-doped aluminosilicate waveguides with silicon optical bench technology. Performance of waveguide amplifiers integrated with pump/signal WDM will be presented, and issues related to their integration will be discussed.Show More
Summary form only given. We review experiments and present new experimental results that demonstrate nonlinear polarization mode conversion in birefringent Bragg gratings, enhanced by the strong dispersion of the grating. We show that many of these experimental results can be explained using a simple intuitive NLSE model, with an effective dispersion provided by the grating. Finally, we use this N...Show More
Summary form only given. Bloch oscillations (BO) arise in a periodic potential superimposed on a linear potential, e.g., an ideal crystal under a static electric field. Observations of BO only recently become feasible using semiconductor superlattices (excitonic BO) and accelerating optical potentials (atomic BO). Landau-Zener tunneling in our geometry manifests itself as radiation losses on a sid...Show More
Highly nonlinear chalcogenide glasses for ultrafast all optical switching in optical TDM communication systems
S. Spalter;G. Lenz;R.E. Slusher;H.Y. Hwang;J. Zimmermann;T. Ktsufuji;S.-W. Cheong;M.E. Lines
Optical Fiber Communication Conference. Technical Digest Postconference Edition. Trends in Optics and Photonics Vol.37 (IEEE Cat. No. 00CH37079)
Year: 2000 | Conference Paper |
Cited by: Patents (1)
Single-mode planar waveguides were fabricated from chalcogenide glass compounds with large Kerr nonlinearities. Strong self-phase modulation of sub-ps pulses along with low linear and nonlinear absorption losses demonstrates the potential for integrated all-optical switching applications.Show More
A tunable dispersion compensating MEMS all-pass filter
C.K. Madsen;J.A. Walker;J.E. Ford;K.W. Goossen;T.N. Nielsen;G. Lenz
A tunable dispersion compensating filter based on a multistage optical all-pass filter with a microelectromechanical (MEM) actuated variable reflector and a thermally tuned cavity is described. A two-stage device was demonstrated with a tuning range of /spl plusmn/100 ps/nm, 50-GHz passband and a group delay ripple less than /spl plusmn/3 ps. The device has negligible polarization dependence and i...Show More
Optical filters are an enabling technology for high density, high bitrate WDM systems. Filters are required for a wide variety of tasks including (de)multiplexing channels, gain equalization and dispersion compensation. As the number of channels, utilized bandwidth of the fiber, spectral efficiency, and bitrate per channel increase, the demand for high performance, compact filters with greater fun...Show More
Integrated planar waveguide amplifier with 15 dB net gain at 1550 nm
J. Shmulovich;A.J. Bruce;G. Lenz;P.B. Hansen;T.N. Nielsen;D.J. Muehlner;G.A. Bogert;I. Brener;E.J. Laskowski;A. Paunescu;I. Ryazansky;D.C. Jacobson;A.E. White
A packaged Er-doped aluminosilicate planar optical waveguide amplifier (POWA) has shown net gain of 15 dB (22 dB) at 1550 nm (1532 nm) with 150 mW/980 nm pump. Low loss (0.25 dB) mode converters that couple between the POWA and standard P-glass waveguides are also demonstrated.Show More
Integrated all-pass filters for tunable dispersion and dispersion slope compensation
C.K. Madsen;G. Lenz;A.J. Bruce;M.A. Cappuzzo;L.T. Gomez;R.E. Scotti
New integrated optical all-pass filters are presented that can be used for tunable dispersion compensation, dispersion slope compensation, and as building blocks in tunable bandpass filters. The dispersion slope compensation capability is demonstrated using ring resonators in /spl Delta/=2% Ge-doped silica planar waveguides. In addition, a tunable four-stage filter with free-spectral range (FSR)=2...Show More
General optical all-pass filter structures for dispersion control in WDM systems
All-pass filters (APFs) are devices that allow phase correction or equalization without introducing any amplitude distortion. An optical implementation of such devices is very attractive since they can be used for dispersion compensation. In contrast to other dispersion control devices, optical APFs can correct any order of dispersion. This can be achieved by careful design of multistage APFs to a...Show More
Dispersion and crosstalk of optical minimum-phase filters in wavelength division multiplexed systems
The amplitude and phase responses of optical minimum-phase filters are uniquely related to each other and therefore their cross talk and dispersion characteristics cannot be adjusted independently. The implications for wavelength-division multiplexed (WDM) systems will be shown experimentally and analytically.Show More
An all-pass filter dispersion compensator using planar waveguide ring resonators
C.K. Madsen;G. Lenz;A.J. Bruce;M.A. Cappuzzo;L.T. Gomez;T.N. Nielsen;L.E. Adams;I. Brenner
A compact, multichannel dispersion-compensating filter is demonstrated with D=/spl plusmn/4200 ps/nm, a /spl plusmn/5 ps group delay ripple, low loss, a 4.5-GHz passband, and the design to compensate for higher-order dispersion.
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First Page of the Article
Show MoreDispersion of optical filters in WDM systems: theory and experiment
24th European Conference on Optical Communication. ECOC '98 (IEEE Cat. No.98TH8398)
Year: 1998 | Conference Paper |
Cited by: Papers (1)
The phase response of an optical filter gives rise to dispersion, which may lead to detrimental pulse distortion and transmission errors. These dispersive properties and their impact on system performance are analysed and transmission experiment results at 10 Gbit/s are presented.Show More
Summary form only given. We propose a novel pulse compressor based on an apodized fiber Bragg grating (FBG) in transmission, where the dispersion can be orders of magnitude greater than standard fiber dispersion. Using coupled-mode theory we derive analytic expressions for the effective dispersion of the fibre Bragg grating to yield the ideal optical pulse compressor.Show More
Wavelength division multiplexing (WDM) communication systems invariably require good optical filters meeting stringent requirements on their amplitude response, the ideal being a perfectly rectangular filter. To achieve high bandwidth utilization, the phase response of these filters is of equal importance, with the ideal filter having perfectly linear phase and therefore constant time delay and no...Show More
Dispersion penalty measurements of narrow fiber Bragg gratings at 10 Gb/s
We measure the dispersion penalty of a narrow fiber Bragg grating (0.25 nm) at 10 Gb/s, in both transmission (pass through channel) and reflection (drop channel). We investigate the effects of transmitter chirp conditions on the dispersion penalty performance.Show More
Summary form only given. Fiber Bragg gratings are often used for routing in WDM lightwave systems. A fiber grating, operating in reflection, permits adding or dropping a selected channel while other channels are transmitted through the grating. Bragg gratings exhibit strong dispersion in transmission at wavelengths close to the stop band. As a result, dispersion-induced degradation of the transmit...Show More
Optical all-pass filters for phase response design with applications for dispersion compensation
Lossless all-pass optical filters are introduced, which can approximate any desired phase response while maintaining a constant, unity amplitude response. Architectures using cascade and lattice structures based on ring resonators and cavities defined by reflectors are discussed. Two applications are presented: 1) for fiber dispersion compensation and 2) for compensation of the nonlinear phase res...Show More
The phase response of optical filters determines their dispersive properties and impacts wavelength-division multiplexing (WDM) system performance. We present a general analysis of the phase response of optical filters used in WDM systems and suggest ways to minimize the detrimental dispersive effects of these filters. Some filters are found to be inherently linear phase filters and in principle a...Show More
Summary form only given. Fiber gratings have become one of the important optical filtering devices in wavelength-division multiplexed (WDM) communication systems. These filters are inherently dispersive elements, which affect the pulses propagating through or reflecting off them by spreading them in time. This dispersion-induced pulse broadening leads ultimately to transmission penalties. Recently...Show More
A hitless reconfigurable add-drop multiplexer for WDM networks utilizing planar waveguides, thermo-optic switches and UV-induced gratings
R.E. Scotti;C. Madsen;C.H. Henry;G. Lenz;Y.P. Li;H. Presby;A. White
Summary form only given. We describe a reconfigurable add-drop multiplexer that can insert or remove a single channel per stage without disrupting service on the remaining channels. The device was fabricated in Ge-doped SiO/sub 2/ channel waveguides with a delta of 1.2 percent on silicon substrates. The device design consists of two null path Mach-Zehnder thermo-optic switches on either side of an...Show More
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