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United States Patent US010727971B1, 2020
In some embodiments , an apparatus includes a reconfigu rable optical add-drop multiplexer (ROADM... more In some embodiments , an apparatus includes a reconfigu rable optical add-drop multiplexer (ROADM). The ROADM has a wavelength selective switch (WSS) that does not perform power equalization when the WSS is operative. The ROADM also has a first pre-amplifier , a first channel power equalizer operatively coupled to the first pre-ampli fier , a second pre-amplifier operatively coupled to the first 210 Channel Power Equalizer 11 Pre Amplifier Stage 2 154 232 WSS Channel Route 142. Line In Line Out 144 120
US Patent 10341039 B1, 2019
The Philosophy of the Kalam, Harry Austryn Wolfson
Papers by Essam Tony
United States Patent US 10 341039 B1, 2019
In some embodiments , an apparatus includes a reconfigu rable optical add-drop multiplexer (ROADM... more In some embodiments , an apparatus includes a reconfigu rable optical add-drop multiplexer (ROADM). The ROADM has a wavelength selective switch (WSS) that does not perform power equalization when the WSS is operative. The ROADM also has a first pre-amplifier , a first channel power equalizer operatively coupled to the first pre-ampli fier , a second pre-amplifier operatively coupled to the first 210 Channel Power Equalizer 11 Pre Amplifier Stage 2 154 232 WSS Channel Route 142. Line In Line Out 144 120
IEEE Potentials, 1994
Optical filters are an important building block in the next generation of optical communication s... more Optical filters are an important building block in the next generation of optical communication systems. Optical networks seem to be headed towards densely packed wavelength-division multiplexing (WDM) systems. These WDM systems require optical filters for the purpose of wavelength selection and switching. Numerous optical filters have been proposed including acousto-optical filters, electro-optical filters, and Fabry-Perots. Acoustically tunable optical filters (ATOFs) are considered promising. ATOFs are not only an important WDM device; they have great potential in many other applications such as optical spectroscopy. The acousto-optic tunable filter has a unique combination of desirable properties. These properties make it a potentially important building block.<<ETX>>
Integrated Photonics Research, 1996
Page 1. 64 / IMD2-1 Electromagnetic Modeling of Optical Guided-wave controlled Microstrip Circuit... more Page 1. 64 / IMD2-1 Electromagnetic Modeling of Optical Guided-wave controlled Microstrip Circuits Essam S. Tony & Sujeet K. Chaudhuri Electrical and Computer Engineering Department , University of Waterloo Waterloo, Ontario, Canada, N2L 3G1. ...
Journal of Lightwave Technology, 1994
A two-waveguide directional coupler filter with an acoustically induced grating structure is prop... more A two-waveguide directional coupler filter with an acoustically induced grating structure is proposed. The directional coupler filter has the advantage that it does not require input and output polarizers and does not require specific birefringent material properties. Since multiple acoustic waves could be applied simultaneously, this property could be used to couple both TE and TM polarizations from one waveguide to the other. This allows for filtering the required optical wavelength from both polarizations simultaneously. A notable weakness of acoustooptical filters and all mode-coupling filters is the high sidelobe levels in their optical transmission spectrum. A technique to suppress these high sidelobe levels in the proposed acoustooptic filter is presented. It is based on simultaneous application of several acoustic waves on the optical waveguide. This technique could be applied to any existing configuration of acoustooptic filters.
IEEE Transactions on Microwave Theory and Techniques, 2001
The spatial Green's function for a rectangular cavity partially filled with multiple layers of lo... more The spatial Green's function for a rectangular cavity partially filled with multiple layers of lossy dielectrics has been derived. The Green's function is used to compute the fields around a discontinuity in a transmission line. To analyze a discontinuity, the unknown surface current maintained on the microstrip discontinuity is expanded in terms of known suitable basis functions. The electric-field components in the plane of the discontinuity region are then written in terms of this current. Imposing the boundary condition that the component of the electric-field tangential to the metallization is zero yields the electric-field integral equation (EFIE). The method of moments is applied to the EFIE to obtain a system of linear equations. The resultant semianalytical expressions were used to conduct accurate modeling of a variety of structures. The validity and accuracy of this method are established through comparison with other published results. Convergence considerations are outlined and verified.
IEEE Transactions on Microwave Theory and Techniques, 1999
Page 1. 1760 IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 47, NO. 9, SEPTEMBER 1999... more Page 1. 1760 IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 47, NO. 9, SEPTEMBER 1999 Effect of Depletion Layer on the Propagation Characteristics of MIS Transmission Lines Essam S. Tony ...
United States Patent US010727971B1, 2020
In some embodiments , an apparatus includes a reconfigu rable optical add-drop multiplexer (ROADM... more In some embodiments , an apparatus includes a reconfigu rable optical add-drop multiplexer (ROADM). The ROADM has a wavelength selective switch (WSS) that does not perform power equalization when the WSS is operative. The ROADM also has a first pre-amplifier , a first channel power equalizer operatively coupled to the first pre-ampli fier , a second pre-amplifier operatively coupled to the first 210 Channel Power Equalizer 11 Pre Amplifier Stage 2 154 232 WSS Channel Route 142. Line In Line Out 144 120
US Patent 10341039 B1, 2019
The Philosophy of the Kalam, Harry Austryn Wolfson
United States Patent US 10 341039 B1, 2019
In some embodiments , an apparatus includes a reconfigu rable optical add-drop multiplexer (ROADM... more In some embodiments , an apparatus includes a reconfigu rable optical add-drop multiplexer (ROADM). The ROADM has a wavelength selective switch (WSS) that does not perform power equalization when the WSS is operative. The ROADM also has a first pre-amplifier , a first channel power equalizer operatively coupled to the first pre-ampli fier , a second pre-amplifier operatively coupled to the first 210 Channel Power Equalizer 11 Pre Amplifier Stage 2 154 232 WSS Channel Route 142. Line In Line Out 144 120
IEEE Potentials, 1994
Optical filters are an important building block in the next generation of optical communication s... more Optical filters are an important building block in the next generation of optical communication systems. Optical networks seem to be headed towards densely packed wavelength-division multiplexing (WDM) systems. These WDM systems require optical filters for the purpose of wavelength selection and switching. Numerous optical filters have been proposed including acousto-optical filters, electro-optical filters, and Fabry-Perots. Acoustically tunable optical filters (ATOFs) are considered promising. ATOFs are not only an important WDM device; they have great potential in many other applications such as optical spectroscopy. The acousto-optic tunable filter has a unique combination of desirable properties. These properties make it a potentially important building block.<<ETX>>
Integrated Photonics Research, 1996
Page 1. 64 / IMD2-1 Electromagnetic Modeling of Optical Guided-wave controlled Microstrip Circuit... more Page 1. 64 / IMD2-1 Electromagnetic Modeling of Optical Guided-wave controlled Microstrip Circuits Essam S. Tony & Sujeet K. Chaudhuri Electrical and Computer Engineering Department , University of Waterloo Waterloo, Ontario, Canada, N2L 3G1. ...
Journal of Lightwave Technology, 1994
A two-waveguide directional coupler filter with an acoustically induced grating structure is prop... more A two-waveguide directional coupler filter with an acoustically induced grating structure is proposed. The directional coupler filter has the advantage that it does not require input and output polarizers and does not require specific birefringent material properties. Since multiple acoustic waves could be applied simultaneously, this property could be used to couple both TE and TM polarizations from one waveguide to the other. This allows for filtering the required optical wavelength from both polarizations simultaneously. A notable weakness of acoustooptical filters and all mode-coupling filters is the high sidelobe levels in their optical transmission spectrum. A technique to suppress these high sidelobe levels in the proposed acoustooptic filter is presented. It is based on simultaneous application of several acoustic waves on the optical waveguide. This technique could be applied to any existing configuration of acoustooptic filters.
IEEE Transactions on Microwave Theory and Techniques, 2001
The spatial Green's function for a rectangular cavity partially filled with multiple layers of lo... more The spatial Green's function for a rectangular cavity partially filled with multiple layers of lossy dielectrics has been derived. The Green's function is used to compute the fields around a discontinuity in a transmission line. To analyze a discontinuity, the unknown surface current maintained on the microstrip discontinuity is expanded in terms of known suitable basis functions. The electric-field components in the plane of the discontinuity region are then written in terms of this current. Imposing the boundary condition that the component of the electric-field tangential to the metallization is zero yields the electric-field integral equation (EFIE). The method of moments is applied to the EFIE to obtain a system of linear equations. The resultant semianalytical expressions were used to conduct accurate modeling of a variety of structures. The validity and accuracy of this method are established through comparison with other published results. Convergence considerations are outlined and verified.
IEEE Transactions on Microwave Theory and Techniques, 1999
Page 1. 1760 IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 47, NO. 9, SEPTEMBER 1999... more Page 1. 1760 IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 47, NO. 9, SEPTEMBER 1999 Effect of Depletion Layer on the Propagation Characteristics of MIS Transmission Lines Essam S. Tony ...