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Jose Capmany - One of the best experts on this subject based on the ideXlab platform.
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fully tunable 360 microwave photonic phase shifter based on a single semiconductor Optical Amplifier
Optics Express, 2011Co-Authors: Juan Sancho, Ivana Gasulla, Juan Lloret, Salvador Sales, Jose CapmanyAbstract:A fully tunable microwave photonic phase shifter involving a single semiconductor Optical Amplifier (SOA) is proposed and demonstrated. 360° microwave phase shift has been achieved by tuning the carrier wavelength and the Optical input power injected in an SOA while properly profiting from the dispersion feature of a conveniently designed notch filter. It is shown that the Optical filter can be advantageously employed to switch between positive and negative microwave phase shifts. Numerical calculations corroborate the experimental results showing an excellent agreement.
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2π microwave photonic phase shifter based on single semiconductor Optical Amplifier
2011 International Topical Meeting on Microwave Photonics jointly held with the 2011 Asia-Pacific Microwave Photonics Conference, 2011Co-Authors: Juan Sancho, Ivana Gasulla, Juan Lloret, Salvador Sales, Jose CapmanyAbstract:A full tunable microwave photonic phase shifter involving a single semiconductor Optical Amplifier (SOA) is proposed and demonstrated. It is shown that the Optical filtering phase characteristic can be advantageously employed to switch between slow and fast light regimes. 360° phase shift has been achieved using two different Optical powers at the SOA input by properly adjusting the frequency detuning between the Optical notch filter and the Optical carrier. Numerical calculations corroborate the experimental results showing an excellent agreement.
Hee Sang Chung - One of the best experts on this subject based on the ideXlab platform.
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A variable gain Optical Amplifier for metro WDM networks with mixed span losses: a gain-clamped semiconductor Optical Amplifier combined with a Raman fiber Amplifier
OFC NFOEC Technical Digest. Optical Fiber Communication Conference 2005., 2005Co-Authors: Jung Mi Oh, Hee Sang ChungAbstract:A variable-gain Optical Amplifier for metro-WDM networks of mixed span losses is demonstrated. It consists of low-gain Raman-fiber-Amplifier and gain-clamped SOA. 16/spl times/10 Gb/s signals were successfully transmitted over 170 km (87dB) of mixed span losses under dynamic add/drops.
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An Optical Amplifier for metro WDM networks, based on a gain-clamped semiconductor Optical Amplifier
Proceedings of SPIE, 2005Co-Authors: Jung Mi Oh, Hee Sang Chung, I. K. Yoon, Seong Taek HwangAbstract:An Optical Amplifier for metro WDM networks, based on a gain-clamped semiconductor Optical Amplifier is proposed. The Amplifier (RAGCSOA) consists of a low gain Raman fiber Amplifier and a gain-clamped semiconductor Optical Amplifier. The RAGCSOA has over 20 dB gain and a noise figure below 3 dB. In addition, the potentially compact Amplifier shows negligible transients under dynamic add-drops. Sixteen channels of 10 Gb/s signals were successfully transmitted over five NZDSF spans of 80 km using RAGCSOAs. RAGCSOAs were also used to successfully transmit sixteen channels of 10 Gb/s WDM signals over four 40km spans of SMF with add-drops. No penalty was observed when 15 out of 16 channels were dynamically add/dropped in all the transmission systems. The RAGCSOA can be very compact when a GCSOA chip and a Raman pump LD chip are packaged in a module.
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A variable-gain Optical Amplifier for metro WDM networks with mixed span losses: a gain-clamped semiconductor Optical Amplifier combined with a Raman fiber Amplifier
IEEE Photonics Technology Letters, 2005Co-Authors: Jung Mi Oh, Hee Sang ChungAbstract:We propose a variable-gain Optical Amplifier that exhibits excellent performance in metro wavelength-division-multiplexing networks containing mixed span losses. The Amplifier consists of a variable-gain Raman fiber Amplifier and a gain-clamped semiconductor Optical Amplifier. Each span of different loss is exactly compensated by adjusting the pump power of a Raman laser diode to have the maximum Optical signal-to-noise ratio. Sixteen channels of 10-Gb/s signals were successfully transmitted over 170 km of mixed span losses (total, 87 dB) under dynamic additions/removals situations.
Anthony E. Kelly - One of the best experts on this subject based on the ideXlab platform.
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Monolithic adjustable gain-clamped semiconductor Optical Amplifier (AGC-SOA)
2013 15th International Conference on Transparent Optical Networks (ICTON), 2013Co-Authors: Jehan Akbar, Craig Michie, Ivan Andonovic, Opeoluwa A. Odedina, Anthony E. KellyAbstract:We report on a monolithic adjustable gain clamped semiconductor Optical Amplifier (AGC-SOA). The device consists of 2 tuneable gratings and a gain section and enables the gain of the SOA to be regulated without loss of saturated output power. Gain control is achieved by adjusting the wavelength overlap of two Distributed Bragg Reflector gratings positioned at either side of the active region which can be wavelength tuned by carrier injection. Gain clamped operation with adjustable gain over a range of 4 dB has been demonstrated. The device uses a 3-QW active layer optimised for high output power thus a maximum saturated output power of +21 dBm was obtained.
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High-Power AlGaInAs Mode-Locked DBR Laser With Integrated Tapered Optical Amplifier
IEEE Photonics Technology Letters, 2013Co-Authors: Jehan Akbar, Mohsin Haji, Michael J. Strain, John H. Marsh, Catrina A. Bryce, Anthony E. KellyAbstract:We demonstrate a high output power passively mode-locked distributed Bragg reflector laser with integrated tapered semiconductor Optical Amplifier, operating at 1.5 μm. These devices are based on an optimized low-Optical-confinement AlGaInAs/InP epitaxial material with a three quantum wells active region and a passive far-field reduction layer. The device generates nearly transform-limited pulses with minimum pulse duration of 4.3 ps at 40-GHz repetition rate. An average output power of 200 mW with a corresponding output peak power of >;1.2 W is achieved.
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Numerical analysis of adjustable gain-clamped semiconductor Optical Amplifier (AGC-SOA) performance
2010 12th International Conference on Transparent Optical Networks, 2010Co-Authors: Craig Michie, Anthony E. Kelly, Ivan AndonovicAbstract:A theoretical model for an adjustable gain-clamped semiconductor Optical Amplifier (AGC-SOA) has been established, based on the wideband steady-state numerical model of SOA. The preliminary simulation characterization results agree well with experimental data.
Michael J. Connelly - One of the best experts on this subject based on the ideXlab platform.
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Reflective Semiconductor Optical Amplifier Pulse Propagation Model
IEEE Photonics Technology Letters, 2012Co-Authors: Michael J. ConnellyAbstract:A simple time-domain model for Optical pulse propagation in a reflective semiconductor Optical Amplifier (RSOA) is described. The RSOA saturation energy, effective carrier lifetime, and spectral hole-burning parameters used in the model are determined using experimental measurements of the input and output pulse temporal profiles to the RSOA and least mean-square fitting. The model accurately predicts the propagation of 39.6 ps pulsewidth variable energy pulses in the RSOA. The model is used to predict the RSOA gain dynamics, spatial dependence of the pulse shape, and dynamic chirp.
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Optical phase conjugation technique using four wave mixing in semiconductor Optical Amplifier
Electronics Letters, 2011Co-Authors: C L Janer, Michael J. ConnellyAbstract:A semiconductor-Optical-Amplifier-based technique to generate the conjugate of an Optical signal is presented. The original probe signal and its conjugate appear at opposite ends of the semiconductor Optical Amplifier, improving, therefore, existing techniques. The basic concept was proposed many years ago but, to the best of our knowledge, has never been experimentally verified. An explanation is given as to why this was not possible, what modifications render the idea practical are explained and experimental results that prove its feasibility are shown.
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Semiconductor Optical Amplifier Pattern Effect Suppression Using a Birefringent Fiber Loop
IEEE Photonics Technology Letters, 2010Co-Authors: Kyriakos E. Zoiros, Colm O'riordan, Michael J. ConnellyAbstract:The capability of a birefringent fiber loop to suppress the pattern effect in a semiconductor Optical Amplifier is experimentally demonstrated. The results verify that compared to direct signal amplification this scheme achieves reduced amplitude modulation, enhanced eye diagram extinction ratio, pulse reshaping, tolerance to long string of spaces, low power penalty, and extended input power dynamic range.
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wideband semiconductor Optical Amplifier steady state numerical model
IEEE Journal of Quantum Electronics, 2001Co-Authors: Michael J. ConnellyAbstract:A wideband steady-state model and efficient numerical algorithm for a bulk InP-InGaAsP homogeneous buried ridge stripe semiconductor Optical Amplifier is described. The model is applicable over a wide range of operating regimes. The relationship between spontaneous emission and material gain is clarified. Simulations and comparisons with experiment are given which demonstrate the versatility of the model.
Jung Mi Oh - One of the best experts on this subject based on the ideXlab platform.
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A variable gain Optical Amplifier for metro WDM networks with mixed span losses: a gain-clamped semiconductor Optical Amplifier combined with a Raman fiber Amplifier
OFC NFOEC Technical Digest. Optical Fiber Communication Conference 2005., 2005Co-Authors: Jung Mi Oh, Hee Sang ChungAbstract:A variable-gain Optical Amplifier for metro-WDM networks of mixed span losses is demonstrated. It consists of low-gain Raman-fiber-Amplifier and gain-clamped SOA. 16/spl times/10 Gb/s signals were successfully transmitted over 170 km (87dB) of mixed span losses under dynamic add/drops.
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An Optical Amplifier for metro WDM networks, based on a gain-clamped semiconductor Optical Amplifier
Proceedings of SPIE, 2005Co-Authors: Jung Mi Oh, Hee Sang Chung, I. K. Yoon, Seong Taek HwangAbstract:An Optical Amplifier for metro WDM networks, based on a gain-clamped semiconductor Optical Amplifier is proposed. The Amplifier (RAGCSOA) consists of a low gain Raman fiber Amplifier and a gain-clamped semiconductor Optical Amplifier. The RAGCSOA has over 20 dB gain and a noise figure below 3 dB. In addition, the potentially compact Amplifier shows negligible transients under dynamic add-drops. Sixteen channels of 10 Gb/s signals were successfully transmitted over five NZDSF spans of 80 km using RAGCSOAs. RAGCSOAs were also used to successfully transmit sixteen channels of 10 Gb/s WDM signals over four 40km spans of SMF with add-drops. No penalty was observed when 15 out of 16 channels were dynamically add/dropped in all the transmission systems. The RAGCSOA can be very compact when a GCSOA chip and a Raman pump LD chip are packaged in a module.
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A variable-gain Optical Amplifier for metro WDM networks with mixed span losses: a gain-clamped semiconductor Optical Amplifier combined with a Raman fiber Amplifier
IEEE Photonics Technology Letters, 2005Co-Authors: Jung Mi Oh, Hee Sang ChungAbstract:We propose a variable-gain Optical Amplifier that exhibits excellent performance in metro wavelength-division-multiplexing networks containing mixed span losses. The Amplifier consists of a variable-gain Raman fiber Amplifier and a gain-clamped semiconductor Optical Amplifier. Each span of different loss is exactly compensated by adjusting the pump power of a Raman laser diode to have the maximum Optical signal-to-noise ratio. Sixteen channels of 10-Gb/s signals were successfully transmitted over 170 km of mixed span losses (total, 87 dB) under dynamic additions/removals situations.