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Aj Seeds - One of the best experts on this subject based on the ideXlab platform.
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Photonic integrated circuit optical phase Lock Loop tuneable active filter
2017 IEEE Photonics Conference 30th Annual Conference of the IEEE Photonics Society, 2018Co-Authors: Balakier K, Shams H, Mj Fice, Ponnampalam L, Graham C, Renaud C, Aj SeedsAbstract:We report the first foundry-fabricated photonic integrated circuit (PIC) optical phase Lock Loop (OPLL) tuneable active optical filter for optical frequency comb line selection and amplification. The PIC containing DBR lasers and photodiodes is integrated with low frequency electronics to create an OPLL, which functions as a highly selective optical filter with sub-GHz bandwidth and 50dB out-of-band suppression. The OPLL output is a single tone coherent with the comb line, whose optical power is 6dB higher than the selected input line, and whose frequency can be offset from the input line by an agile and precisely defined frequency
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Monolithically integrated optical phase Lock Loop with 1 THz tuneability
42rd International Conference on Infrared Millimetre and Terahertz Waves, 2017Co-Authors: Balakier K, Mj Fice, Ponnampalam L, Graham C, Aj Seeds, Renaud CAbstract:We have demonstrated a monolithically integrated optical phase Lock Loop based on a foundry fabricated photonic integrated circuit. The InP chip contains PIN photodiodes integrated with a 1.5 μm DBR laser which can be phase stabilised with respect to an external optical reference tone at all wavelengths throughout its 1 THz (8 nm) tuning range. The frequency offset between the two lasers can be set to any value between 4 GHz and 12 GHz. The phase noise of the heterodyne signal is also reported. Such an OPLL, together with an optical frequency comb and broad-bandwidth photodetector, could be used for high purity, tuneable mm-wave / THz signal generation
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Foundry fabricated photonic integrated circuit optical phase Lock Loop.
2017Co-Authors: Bałakier K, Mj Fice, Ponnampalam L, Cs Graham, Wonfor A, Aj Seeds, Cc RenaudAbstract:This paper describes the first foundry-based InP photonic integrated circuit (PIC) designed to work within a heterodyne optical phase Locked Loop (OPLL). The PIC and an external electronic circuit were used to phase-Lock a single-line semiconductor laser diode to an incoming reference laser, with tuneable frequency offset from 4 GHz to 12 GHz. The PIC contains 33 active and passive components monolithically integrated on a single chip, fully demonstrating the capability of a generic foundry PIC fabrication model. The electronic part of the OPLL consists of commercially available RF components. This semi-packaged system stabilizes the phase and frequency of the integrated laser so that an absolute frequency, high-purity heterodyne signal can be generated when the OPLL is in operation, with phase noise lower than -100 dBc/Hz at 10 kHz offset from the carrier. This is the lowest phase noise level ever demonstrated by monolithically integrated OPLLs
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a pilot carrier coherent leo to ground downlink system using an optical injection phase Lock Loop oipll technique
Journal of Lightwave Technology, 2012Co-Authors: Yozo Shoji, Mj Fice, Yoshihisa Takayama, Aj SeedsAbstract:A pilot-carrier coherent low-earth-orbit (LEO) satellite to ground (LEO-to-Ground) downlink system using an optical injection phase Lock Loop (OIPLL) technique is proposed and its feasibility under Doppler frequency shift conditions is demonstrated. A fiber-optic based experimental system is configured and it is demonstrated that a 10 Gbps BPSK transmission system based on the proposed configuration can successfully maintain stable frequency and phase Locking status under simulated Doppler frequency shift conditions. It is demonstrated that the stable Locking status is maintained over a 10.3 GHz (54 ppm) frequency offset with a maximum rate-of-change of up to 32.4 GHz/s (168 ppm/s), which is ample to meet the requirement for a coherent LEO-to-Ground downlink system. The Locking capability of the experimental system for more rapidly changing Doppler frequency shift is investigated. It is shown that the OIPLL receiver remains Locked for maximum rates of change of 2.6 THz/s (13 500 ppm/s) or more for peak-to-peak frequency offsets up to 2 GHz (10.7 ppm). The phase noise performance of the system is also investigated and phase noise power of less than -100 dBc/Hz at greater than 1 MHz offset frequency is achieved even if the received laser signal suffers from a simulated Doppler frequency shift with peak-to-peak frequency offset of 2.4 GHz (12.5 ppm) and maximum rate of change of 750 GHz/s (3 900 ppm/s).
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a pilot carrier coherent leo to ground downlink system using an optical injection phase Lock Loop oipll technique
Journal of Lightwave Technology, 2012Co-Authors: Yozo Shoji, Mj Fice, Yoshihisa Takayama, Aj SeedsAbstract:A pilot-carrier coherent low-earth-orbit (LEO) satellite to ground (LEO-to-Ground) downlink system using an optical injection phase Lock Loop (OIPLL) technique is proposed and its feasibility under Doppler frequency shift conditions is demonstrated. A fiber-optic based experimental system is configured and it is demonstrated that a 10 Gbps BPSK transmission system based on the proposed configuration can successfully maintain stable frequency and phase Locking status under simulated Doppler frequency shift conditions. It is demonstrated that the stable Locking status is maintained over a 10.3 GHz (54 ppm) frequency offset with a maximum rate-of-change of up to 32.4 GHz/s (168 ppm/s), which is ample to meet the requirement for a coherent LEO-to-Ground downlink system. The Locking capability of the experimental system for more rapidly changing Doppler frequency shift is investigated. It is shown that the OIPLL receiver remains Locked for maximum rates of change of 2.6 THz/s (13 500 ppm/s) or more for peak-to-peak frequency offsets up to 2 GHz (10.7 ppm). The phase noise performance of the system is also investigated and phase noise power of less than -100 dBc/Hz at greater than 1 MHz offset frequency is achieved even if the received laser signal suffers from a simulated Doppler frequency shift with peak-to-peak frequency offset of 2.4 GHz (12.5 ppm) and maximum rate of change of 750 GHz/s (3 900 ppm/s).
J N Hovenier - One of the best experts on this subject based on the ideXlab platform.
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phase Locking of a 3 4 thz third order distributed feedback quantum cascade laser using a room temperature superlattice harmonic mixer
Applied Physics Letters, 2013Co-Authors: D J Hayton, Andrey M. Baryshev, J N Hovenier, Andrey Khudchenko, D G Pavelyev, Qing Hu, J L Reno, V L VaksAbstract:We report on the phase Locking of a 3.4 THz third-order distributed feedback quantum cascade laser (QCL) using a room temperature GaAs/AlAs superlattice diode as both a frequency multiplier and an internal harmonic mixer. A signal-to-noise level of 60 dB is observed in the intermediate frequency signal between the 18th harmonic of a 190.7 GHz reference source and the 3433 GHz QCL. A phase-Lock Loop with 7 MHz bandwidth results in QCL emission that is 96% Locked to the reference source. We characterize the QCL temperature and electrical tuning mechanisms and show that frequency dependence of these mechanisms can prevent phase-Locking under certain QCL bias conditions.
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phase Locking of a 2 7 thz quantum cascade laser to a microwave reference
Optics Letters, 2009Co-Authors: P Khosropanah, Andrey M. Baryshev, J N Hovenier, Wen Zhang, Willem Jellema, J R Gao, T M Klapwijk, D G Paveliev, Benjamin S WilliamsAbstract:We demonstrate the phase Locking of a 2.7 THz metal–metal waveguide quantum cascade laser (QCL) to an external microwave signal. The reference is the 15th harmonic, generated by a semiconductor superlattice nonlinear device, of a signal at 182 GHz, which itself is generated by a multiplier chain (x12) from a microwave synthesizer at ~15 GHz. Both laser and reference radiations are coupled into a bolometer mixer, resulting in a beat signal, which is fed into a phase-Lock Loop. The spectral analysis of the beat signal confirms that the QCL is phase Locked. This result opens the possibility to extend heterodyne interferometers into the far-infrared range.
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phase Locking and spectral linewidth of a two mode terahertz quantum cascade laser
Applied Physics Letters, 2006Co-Authors: Andrey M. Baryshev, J N Hovenier, A J L Adam, Irmantas Kašalynas, T O Klaassen, Benjamin S WilliamsAbstract:We have studied the phase Locking and spectral linewidth of an ? 2.7?THz quantum cascade laser by mixing its two lateral lasing modes. The beat signal at about 8?GHz is compared with a microwave reference by applying conventional phase Lock Loop circuitry with feedback to the laser bias current. Phase Locking has been demonstrated, resulting in a narrow beat linewidth of less than 10?Hz. Under frequency stabilization we find that the terahertz line profile is essentially Lorentzian with a minimum linewidth of ? 6.3?kHz. Power dependent measurements suggest that this linewidth does not approach the Schawlow-Townes limit.
Benjamin S Williams - One of the best experts on this subject based on the ideXlab platform.
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phase Locking of a 2 7 thz quantum cascade laser to a microwave reference
Optics Letters, 2009Co-Authors: P Khosropanah, Andrey M. Baryshev, J N Hovenier, Wen Zhang, Willem Jellema, J R Gao, T M Klapwijk, D G Paveliev, Benjamin S WilliamsAbstract:We demonstrate the phase Locking of a 2.7 THz metal–metal waveguide quantum cascade laser (QCL) to an external microwave signal. The reference is the 15th harmonic, generated by a semiconductor superlattice nonlinear device, of a signal at 182 GHz, which itself is generated by a multiplier chain (x12) from a microwave synthesizer at ~15 GHz. Both laser and reference radiations are coupled into a bolometer mixer, resulting in a beat signal, which is fed into a phase-Lock Loop. The spectral analysis of the beat signal confirms that the QCL is phase Locked. This result opens the possibility to extend heterodyne interferometers into the far-infrared range.
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phase Locking and spectral linewidth of a two mode terahertz quantum cascade laser
Applied Physics Letters, 2006Co-Authors: Andrey M. Baryshev, J N Hovenier, A J L Adam, Irmantas Kašalynas, T O Klaassen, Benjamin S WilliamsAbstract:We have studied the phase Locking and spectral linewidth of an ? 2.7?THz quantum cascade laser by mixing its two lateral lasing modes. The beat signal at about 8?GHz is compared with a microwave reference by applying conventional phase Lock Loop circuitry with feedback to the laser bias current. Phase Locking has been demonstrated, resulting in a narrow beat linewidth of less than 10?Hz. Under frequency stabilization we find that the terahertz line profile is essentially Lorentzian with a minimum linewidth of ? 6.3?kHz. Power dependent measurements suggest that this linewidth does not approach the Schawlow-Townes limit.
Mj Fice - One of the best experts on this subject based on the ideXlab platform.
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Photonic integrated circuit optical phase Lock Loop tuneable active filter
2017 IEEE Photonics Conference 30th Annual Conference of the IEEE Photonics Society, 2018Co-Authors: Balakier K, Shams H, Mj Fice, Ponnampalam L, Graham C, Renaud C, Aj SeedsAbstract:We report the first foundry-fabricated photonic integrated circuit (PIC) optical phase Lock Loop (OPLL) tuneable active optical filter for optical frequency comb line selection and amplification. The PIC containing DBR lasers and photodiodes is integrated with low frequency electronics to create an OPLL, which functions as a highly selective optical filter with sub-GHz bandwidth and 50dB out-of-band suppression. The OPLL output is a single tone coherent with the comb line, whose optical power is 6dB higher than the selected input line, and whose frequency can be offset from the input line by an agile and precisely defined frequency
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coherent frequency tuneable thz wireless signal generation using an optical phase Lock Loop system
International Topical Meeting on Microwave Photonics, 2017Co-Authors: Haymen Shams, Mj Fice, Cc Renaud, Katarzyna Balakier, L Ponnampalam, Chris Graham, A J Seeds, Frederic Van DijkAbstract:We demonstrate experimentally, for the first time, the photonic generation of a continuous tunable THz wireless signal based on using an optical phase Lock Loop (OPLL) subsystem and optical frequency comb generator (OFCG). The OPLL is employed to select one line from the optical comb and shift it by the desired frequency offset allowing for the frequency tuneability of THz carrier signal. The selected optical tone from the OPLL is heterodyne mixed with another selected optical line of the optical comb to generate a stabilized THz frequency carrier with a low phase noise. Full system operation is demonstrated by transmitting wirelessly a THz signal modulated with 10 Gbaud QPSK data. The system evaluation is carried out for four selected THz carrier frequencies obtained by tuning the laser included in the OPLL. This configuration is a promising architecture that would allow a THz carrier to be flexibly generated at the central office with high frequency stability and low phase noise.
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Monolithically integrated optical phase Lock Loop with 1 THz tuneability
42rd International Conference on Infrared Millimetre and Terahertz Waves, 2017Co-Authors: Balakier K, Mj Fice, Ponnampalam L, Graham C, Aj Seeds, Renaud CAbstract:We have demonstrated a monolithically integrated optical phase Lock Loop based on a foundry fabricated photonic integrated circuit. The InP chip contains PIN photodiodes integrated with a 1.5 μm DBR laser which can be phase stabilised with respect to an external optical reference tone at all wavelengths throughout its 1 THz (8 nm) tuning range. The frequency offset between the two lasers can be set to any value between 4 GHz and 12 GHz. The phase noise of the heterodyne signal is also reported. Such an OPLL, together with an optical frequency comb and broad-bandwidth photodetector, could be used for high purity, tuneable mm-wave / THz signal generation
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Foundry fabricated photonic integrated circuit optical phase Lock Loop.
2017Co-Authors: Bałakier K, Mj Fice, Ponnampalam L, Cs Graham, Wonfor A, Aj Seeds, Cc RenaudAbstract:This paper describes the first foundry-based InP photonic integrated circuit (PIC) designed to work within a heterodyne optical phase Locked Loop (OPLL). The PIC and an external electronic circuit were used to phase-Lock a single-line semiconductor laser diode to an incoming reference laser, with tuneable frequency offset from 4 GHz to 12 GHz. The PIC contains 33 active and passive components monolithically integrated on a single chip, fully demonstrating the capability of a generic foundry PIC fabrication model. The electronic part of the OPLL consists of commercially available RF components. This semi-packaged system stabilizes the phase and frequency of the integrated laser so that an absolute frequency, high-purity heterodyne signal can be generated when the OPLL is in operation, with phase noise lower than -100 dBc/Hz at 10 kHz offset from the carrier. This is the lowest phase noise level ever demonstrated by monolithically integrated OPLLs
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a pilot carrier coherent leo to ground downlink system using an optical injection phase Lock Loop oipll technique
Journal of Lightwave Technology, 2012Co-Authors: Yozo Shoji, Mj Fice, Yoshihisa Takayama, Aj SeedsAbstract:A pilot-carrier coherent low-earth-orbit (LEO) satellite to ground (LEO-to-Ground) downlink system using an optical injection phase Lock Loop (OIPLL) technique is proposed and its feasibility under Doppler frequency shift conditions is demonstrated. A fiber-optic based experimental system is configured and it is demonstrated that a 10 Gbps BPSK transmission system based on the proposed configuration can successfully maintain stable frequency and phase Locking status under simulated Doppler frequency shift conditions. It is demonstrated that the stable Locking status is maintained over a 10.3 GHz (54 ppm) frequency offset with a maximum rate-of-change of up to 32.4 GHz/s (168 ppm/s), which is ample to meet the requirement for a coherent LEO-to-Ground downlink system. The Locking capability of the experimental system for more rapidly changing Doppler frequency shift is investigated. It is shown that the OIPLL receiver remains Locked for maximum rates of change of 2.6 THz/s (13 500 ppm/s) or more for peak-to-peak frequency offsets up to 2 GHz (10.7 ppm). The phase noise performance of the system is also investigated and phase noise power of less than -100 dBc/Hz at greater than 1 MHz offset frequency is achieved even if the received laser signal suffers from a simulated Doppler frequency shift with peak-to-peak frequency offset of 2.4 GHz (12.5 ppm) and maximum rate of change of 750 GHz/s (3 900 ppm/s).
Amnon Yariv - One of the best experts on this subject based on the ideXlab platform.
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sideband Locking of a single section semiconductor distributed feedback laser in an optical phase Lock Loop
Optics Letters, 2009Co-Authors: Naresh Satyan, Wei Liang, Arseny Vasilyev, George Rakuljic, Amnon YarivAbstract:The bandwidth and performance of optical phase-Lock Loops (OPLLs) using single-section semiconductor lasers (SCLs) are severely limited by the nonuniform frequency modulation response of the lasers. It is demonstrated that this restriction is eliminated by the sideband Locking of a single-section distributed-feedback SCL to a master laser in a heterodyne OPLL, thus enabling a delay-limited Loop bandwidth. The lineshape of the phase-Locked SCL output is characterized using a delayed self-heterodyne measurement.
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coherence cloning using semiconductor laser optical phase Lock Loops
IEEE Journal of Quantum Electronics, 2009Co-Authors: Naresh Satyan, Wei Liang, Amnon YarivAbstract:We demonstrate the concept of coherence cloning where the coherence properties of a high-quality spectrally stabilized fiber laser are transferred to a commercially available high-power DFB semiconductor laser (SCL) using an optical phase-Lock Loop. The lineshapes and frequency noise spectra of the fiber laser and the free-running and phase-Locked SCL are measured and compared. The bandwidth of coherence cloning is limited by physical factors such as the laser frequency modulation response and the Loop propagation delay. The effect of this limited bandwidth on the laser field and on self-heterodyne interferometric measurements are analyzed.
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dynamic analysis of the semiconductor laser as a current controlled oscillator in the optical phased Lock Loop applications
Optics Letters, 2005Co-Authors: Amnon YarivAbstract:A methodology for treating the semiconductor laser as a current-controlled oscillator in an optical phase-Lock Loop is presented. The formalism is applied to phase demodulation of optical beams, reduction of phase noise by self-homodyning, and phase Locking of a semiconductor laser array.
