Papers by Aleksandra Kaszubowska
arXiv (Cornell University), Nov 27, 2023
Experimental methods are being developed to enable quantum communication systems research in test... more Experimental methods are being developed to enable quantum communication systems research in testbeds. We describe testbed architectures for emerging quantum technologies and how they can integrate with existing fibre optical testbeds, specifically OpenIreland.
This dataset contains the figures and data presented in the paper <Frequency division using a ... more This dataset contains the figures and data presented in the paper <Frequency division using a soliton-injected semiconductor gain-switched frequency comb>.
This dataset contains the figures and data presented in the paper <Gain-switched semiconductor... more This dataset contains the figures and data presented in the paper <Gain-switched semiconductor laser driven soliton microcombs>.
Journal of Lightwave Technology, Aug 1, 2023
Conference on Lasers and Electro-Optics, 2021
Conference on Lasers and Electro-Optics, 2020
With optical spectral marks equally spaced by a frequency in the microwave or the radio frequency... more With optical spectral marks equally spaced by a frequency in the microwave or the radio frequency domain, optical frequency combs have been used not only to synthesize optical frequencies from microwave references but also to generate ultralow-noise microwaves via optical frequency division. Here, we combine two compact frequency combs, namely, a soliton microcomb and a semiconductor gain-switched comb, to demonstrate low-noise microwave generation based on a novel frequency division technique. Using a semiconductor laser that is driven by a sinusoidal current and injection-locked to microresonator solitons, our scheme transfers the spectral purity of a dissipative soliton oscillator into the subharmonic frequencies of the microcomb repetition rate. In addition, the gain-switched comb provides dense optical spectral emissions that divide the line spacing of the soliton microcomb. With the potential to be fully integrated, the merger of the two chipscale devices may profoundly facilitate the wide application of frequency comb technology.
Journal of Optical Networking, Jan 23, 2009
Journal of Lightwave Technology
In this paper, we demonstrate a novel multi-section directly modulated laser transmitter for upst... more In this paper, we demonstrate a novel multi-section directly modulated laser transmitter for upstream operation in the application of time wavelength division multiplexing (TWDM) architecture. The photonic integrated circuit (PIC) is fabricated using a regrowth-free process that favors simplified and fast manufacturing. The PIC is based on a master-slave configuration, with an addition of a variable optical attenuator (VOA) section between them, and a semiconductor optical amplifier (SOA) at the output. The VOA enables control of the optical injection from the master to the directly modulated slave laser improving the transmission performance. The integrated SOA section at the output is used to boost or turn off the optical output power of the transmitter, thereby enabling burst mode operation. Experimental results show that the PIC can be tuned to four wavelength channels on a 100 GHz frequency grid. We also demonstrate that each channel achieves error-free performance (bit error ratio < 10e-9), when modulated with 10 Gbps signal and transmitted over 25 km and 50 km fiber. The SOA-based output disable feature of the PIC delivers more than 60 dB attenuation. Index Terms-And photonic integrated circuits (PICs), chromatic dispersion, high-speed transmitters, monolithic integrated circuits.
Journal of Optical Communications and Networking
A reconfigurable photonic integrated transmitter, enabling dynamic resource allocation in the met... more A reconfigurable photonic integrated transmitter, enabling dynamic resource allocation in the metro-access network, is proposed. The device consists of a multicarrier sliceable bandwidth variable transmitter (MC-SBVT) realized in indium phosphide and a silicon-nitride-based optical cross-connect (OXC). The proposed architecture delivers full flexibility in terms of the choice of data format/bandwidth, channel spacing, and wavelength assignment. The functional design of the MC-SBVT and OXC as well as their practical realization are discussed. Preliminary characterization results of the photonic-integrated-circuit-based MC-SBVT, demonstrating the reconfigurability of the device, are also presented.
Conference on Lasers and Electro-Optics, 2019
We demonstrate an RoF system with a simplified RRU, by employing a remote uplink downconversion a... more We demonstrate an RoF system with a simplified RRU, by employing a remote uplink downconversion and downlink wavelength reuse. An error-free transmission of 64-QAM UF-OFDM signals over 12 km of fiber is also shown. © 2019 The Author(s)
Optica Advanced Photonics Congress 2022
We demonstrate a new approach to the calibration and control of a multi-section active demultiple... more We demonstrate a new approach to the calibration and control of a multi-section active demultiplexer realized as a photonic integrated circuit. Thresholding, clustering and curve fitting are used for the choice of optimum operational parameters.
Conference on Lasers and Electro-Optics
The noise figure and saturation power of a multi-section SOA, with non-uniform bias conditions, a... more The noise figure and saturation power of a multi-section SOA, with non-uniform bias conditions, are characterized. Optimum biasing achieves 2 dB improvement at a BER of 10−9 for 10 Gb/s OOK transmission over 25 km.
Physical Review Applied
Using phase-modulation-induced potential gradient whose period is synchronized to a microwave opt... more Using phase-modulation-induced potential gradient whose period is synchronized to a microwave optoelectronic oscillator, dissipative Kerr solitons generated in a crystalline optical microresonator are trapped by the soliton tweezing effect, exhibiting a stabilized soliton repetition rate. In the meantime, side-mode suppression of the microwave signal is enabled by the photodetection of the soliton train. Substantiated both experimentally and theoretically, the hybrid system produces a drift-reduced microcomb and a spectrum-purified optoelectronic oscillator simultaneously, yielding a low-cost toolkit for microwave and optical metrology.
Conference on Lasers and Electro-Optics
We experimentally demonstrate an OFC and active demultiplexer based 12.5 GHz DWDM system for DCIs... more We experimentally demonstrate an OFC and active demultiplexer based 12.5 GHz DWDM system for DCIs. Successful transmission of directly modulated 17.5 Gb/s/λ 16-QAM DMT data is accomplished by using DD-LMS equalizer to overcome cross-channel interference.
IEEE Photonics Journal
We demonstrate a novel directly modulated transmitter, based on a six-section photonic integrated... more We demonstrate a novel directly modulated transmitter, based on a six-section photonic integrated circuit. The device uses a unique master-slave configuration with a variable optical attenuator in between, allowing decoupling of cavities and independent control of the injection power. The VOA also provides the ability to find an optimum injection level that balances the tradeoff between the extinction ratio and the chirp of the transmitted signal. Using the device, an error-free transmission of a 10 Gb/s non-return-to-zero signal over 25 km and 50 km standard single mode fibre is achieved.
This dataset contains the figures and data presented in the paper <Gain-switched semiconductor... more This dataset contains the figures and data presented in the paper <Gain-switched semiconductor laser driven soliton microcombs>.
This dataset contains the figures and data presented in the paper <Frequency division using a ... more This dataset contains the figures and data presented in the paper <Frequency division using a soliton-injected semiconductor gain-switched frequency comb>.
Conference on Lasers and Electro-Optics, 2019
A gain-switched VCSEL is subjected to external optical injection to enable optimized comb generat... more A gain-switched VCSEL is subjected to external optical injection to enable optimized comb generation. The generated comb at 6.25GHz portrays a carrier-to-noise-ratio of 55dB, optical linewidth of 15kHz and a RIN of ~130dB/Hz. © 2019 The Author(s)
2018 IEEE International Semiconductor Laser Conference (ISLC), 2018
Optical frequency combs (OFCs) were well documented by early reports in the 60's and 70's... more Optical frequency combs (OFCs) were well documented by early reports in the 60's and 70's [1] including the Nobel lecture by Hansch [2] and Hall [3]. During the last decade, there has been an immense amount of research activity focused on OFCs and their wide range of applications. These range from molecular spectroscopy [4], astronomy [5] to RF photonics [6], optical clocks [7], arbitrary waveform generation [8] and high speed optical communications [9]. An OFC can be defined, as a series of equally spaced discrete spectral lines [10]. There are various parameters that could be used to characterise an OFC, including frequency and amplitude stability, occupied bandwidth, free spectral range (repetition rate), spectral flatness, phase noise, phase correlation etc. However, the choice of optimum OFC parameters depends on the nature of the application. This work focuses on the parameter requirements for OFCs employed in next generation optical communication systems. Emerging broadband applications and bandwidth hungry services are driving the evolution of optical networks. Next generation short and long reach communication networks would be required to provide data rates of multiple Tb/s. Such high line rates are not feasible using a single wavelength channel, as the bandwidth of electronics will act as a bottleneck. However, the multi-Tb/s transmission capacity can be achieved by utilising highly parallel wavelength division multiplexing (WDM), with tens or hundreds of channels, in combination with spectrally efficient advanced modulation formats. Through such an approach, symbol rates can be maintained at levels that are compliant with the electrical bandwidth of energy-efficient CMOS driver circuitry [11]. One of the factors that has been attracting a lot of attention, with the move to higher line-rates, is maximizing the information spectral density (ISD) achieved at the transmitter. With the available spectral bandwidth becoming an extremely precious commodity, enhancing the ISD beyond what is achievable through the employment of the advanced modulation formats, becomes of paramount importance. Current optical WDM systems, using a large array of laser transmitters, require inter-channel guard bands to avoid cross channel interference/cater for the wavelength drift of the free running lasers. However, OFCs portray precise frequency spacing thereby making them an invaluable asset to densely packed communication systems. Hence, the use of OFCs for advanced multicarrier transmission techniques, like Nyquist wavelength division multiplexing (NWDM) [12], coherent optical orthogonal frequency division multiplexing (CO-OFDM) [13, 14] or time frequency packing (TFP) [15], have been investigated to realize terabit transponders. The authors will present the major benefits and shortcomings of the most commonly used techniques [16–22] that are available for the generation of OFCs. Focus will be placed on the inherent advantageous properties exhibited by the different techniques, while attention will also be paid to ways of overcoming some of the shortcomings [23–25].
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Papers by Aleksandra Kaszubowska