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Li R, Chen M, Shi X, Han W, Wang X, Zhao W, Liu J, Teng C, Deng S, Cheng Y, Yuan L. Semi-embedded slot waveguide electro-optic modulator. APPLIED OPTICS 2023; 62:7346-7353. [PMID: 37855501 DOI: 10.1364/ao.498890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Accepted: 08/29/2023] [Indexed: 10/20/2023]
Abstract
Electro-optic modulators are essential devices on silicon photonic chips in modern optical communication networks. This paper presents a compact, low-loss electro-optic modulator. The modulation efficiency is greatly improved by embedding the lower half of the slot waveguide into the buried oxide layer and inserting graphene at the junction. The interaction of graphene with an optical field in a waveguide is studied using the finite element method. The functions of phase modulation and absorption modulation are realized by changing the gate voltage to change the chemical potential of graphene. The semi-embedded slot waveguide optical modulator has a length of 50 µm. After simulation verification, it can be used as an electro-absorption modulator and can achieve a modulation depth of 26.38 dB and an insertion loss of 0.60 dB. When used as an electro-refractive modulator, it can be realized with a linear change of phase from zero to π; the total insertion loss is only 0.59 dB. The modulator has a modulation bandwidth of 79.6 GHz, and the energy consumption as electro-absorption and electro-refraction modulation are 0.51 and 1.92 pj/bit, respectively. Compared with common electro-optic modulators, the electro-optic modulator designed in this paper has a higher modulation effect and also takes into account the advantages of low insertion loss and low energy consumption. This research is helpful for the design of higher-performance optical communication network devices.
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Amin R, Maiti R, Gui Y, Suer C, Miscuglio M, Heidari E, Khurgin JB, Chen RT, Dalir H, Sorger VJ. Heterogeneously integrated ITO plasmonic Mach-Zehnder interferometric modulator on SOI. Sci Rep 2021; 11:1287. [PMID: 33446735 PMCID: PMC7809469 DOI: 10.1038/s41598-020-80381-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2020] [Accepted: 12/18/2020] [Indexed: 12/05/2022] Open
Abstract
Densely integrated active photonics is key for next generation on-chip networks for addressing both footprint and energy budget concerns. However, the weak light-matter interaction in traditional active Silicon optoelectronics mandates rather sizable device lengths. The ideal active material choice should avail high index modulation while being easily integrated into Silicon photonics platforms. Indium tin oxide (ITO) offers such functionalities and has shown promising modulation capacity recently. Interestingly, the nanometer-thin unity-strong index modulation of ITO synergistically combines the high group-index in hybrid plasmonic with nanoscale optical modes. Following this design paradigm, here, we demonstrate a spectrally broadband, GHz-fast Mach–Zehnder interferometric modulator, exhibiting a high efficiency signified by a miniscule VπL of 95 V μm, deploying a one-micrometer compact electrostatically tunable plasmonic phase-shifter, based on heterogeneously integrated ITO thin films into silicon photonics. Furthermore we show, that this device paradigm enables spectrally broadband operation across the entire telecommunication near infrared C-band. Such sub-wavelength short efficient and fast modulators monolithically integrated into Silicon platform open up new possibilities for high-density photonic circuitry, which is critical for high interconnect density of photonic neural networks or applications in GHz-fast optical phased-arrays, for example.
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Affiliation(s)
- Rubab Amin
- Department of Electrical and Computer Engineering, George Washington University, Washington, DC, 20052, USA
| | - Rishi Maiti
- Department of Electrical and Computer Engineering, George Washington University, Washington, DC, 20052, USA
| | - Yaliang Gui
- Department of Electrical and Computer Engineering, George Washington University, Washington, DC, 20052, USA
| | - Can Suer
- Department of Electrical and Computer Engineering, George Washington University, Washington, DC, 20052, USA
| | - Mario Miscuglio
- Department of Electrical and Computer Engineering, George Washington University, Washington, DC, 20052, USA
| | - Elham Heidari
- Electrical and Computer Engineering Department, Microelectronics Research Center, University of Texas at Austin, Austin, TX, 78758, USA
| | - Jacob B Khurgin
- Department of Electrical and Computer Engineering, Johns Hopkins University, Baltimore, MD, 21218, USA
| | - Ray T Chen
- Electrical and Computer Engineering Department, Microelectronics Research Center, University of Texas at Austin, Austin, TX, 78758, USA
| | - Hamed Dalir
- Optelligence LLC, Alexandria, VA, 22302, USA
| | - Volker J Sorger
- Department of Electrical and Computer Engineering, George Washington University, Washington, DC, 20052, USA.
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Large refractive index variations induced by accumulating triplet excitons under photoexcitation at low power. Chem Phys Lett 2018. [DOI: 10.1016/j.cplett.2018.05.029] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Vigne S, Hossain N, Fesharaki F, Kabir SMH, Margot J, Wu K, Chaker M. Optical properties of epitaxial Ca xBa 1-xNb 2O 6 thin film based rib-waveguide structure on (001) MgO for electro-optic applications. OPTICS EXPRESS 2016; 24:28573-28582. [PMID: 27958501 DOI: 10.1364/oe.24.028573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
In this work, optical properties of epitaxial CaxBa1-xNb2O6, CBN (x = 0.28) thin film based waveguides are studied at 1550 nm optical communications wavelength. CBN thin films are deposited epitaxially on MgO substrates using Pulsed Laser Deposition and characterized by prism coupling to extract the refractive index and propagation loss. It is shown that the 2 µm-thick epitaxial CBN thin films have a refractive index close to the bulk form and the CBN planar waveguides have a propagation loss of 4.3 ± 0.5 dB/cm. 1 cm-long rib waveguide structures were fabricated using a high density plasma etching. Their propagation losses were measured by the cutback method at 8.4 ± 0.6 dB/cm.
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Alexander JK, Morrissey PE, Yang H, Yang M, Marraccini PJ, Corbett B, Peters FH. Monolithically integrated low linewidth comb source using gain switched slotted Fabry-Perot lasers. OPTICS EXPRESS 2016; 24:7960-7965. [PMID: 27137237 DOI: 10.1364/oe.24.007960] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A monolithically integrated low linewidth optical comb is demonstrated by gain switching of a three-section laser device. The device consists of a slave and master section separated by a shared slotted mirror section. Wavelength tunability has been demonstrated by varying the electrical bias of each section. The number of comb lines is shown to almost double with the addition of optical injection from the master section into the slave. The unmodulated device has a full width half max linewidth of ∼ 500 kHz, while the comb line set were measured to be ∼ 600 kHz, with little degradation as a result of gain switching. The FSR (free spectral range) of the demonstrated comb is 4 GHz, which is tunable within the bandwidth of the device, with a central wavelength of 1580.3 nm.
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Shi Y, Frattarelli D, Watanabe N, Facchetti A, Cariati E, Righetto S, Tordin E, Zuccaccia C, Macchioni A, Wegener SL, Stern CL, Ratner MA, Marks TJ. Ultra-High-Response, Multiply Twisted Electro-optic Chromophores: Influence of π-System Elongation and Interplanar Torsion on Hyperpolarizability. J Am Chem Soc 2015; 137:12521-38. [DOI: 10.1021/jacs.5b04636] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yanrong Shi
- Department
of Chemistry and the Materials Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - David Frattarelli
- Department
of Chemistry and the Materials Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Naoki Watanabe
- Department
of Chemistry and the Materials Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Antonio Facchetti
- Department
of Chemistry and the Materials Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Elena Cariati
- Dipartimento
di Chimica dell’Università di Milano and Unità di Ricerca dell’INSTM
di Milano, Via Golgi 19, I-20133 Milano, Italy
| | - Stefania Righetto
- Dipartimento
di Chimica dell’Università di Milano and Unità di Ricerca dell’INSTM
di Milano, Via Golgi 19, I-20133 Milano, Italy
| | - Elisa Tordin
- Dipartimento
di Chimica dell’Università di Milano and Unità di Ricerca dell’INSTM
di Milano, Via Golgi 19, I-20133 Milano, Italy
| | - Cristiano Zuccaccia
- Dipartimento
di Chimica, Biologia e Biotecnologie and CIRCC, Università degli Studi di Perugia, Via Elce di Sotto, I-06123 Perugia, Italy
| | - Alceo Macchioni
- Dipartimento
di Chimica, Biologia e Biotecnologie and CIRCC, Università degli Studi di Perugia, Via Elce di Sotto, I-06123 Perugia, Italy
| | - Staci L. Wegener
- Department
of Chemistry and the Materials Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Charlotte L. Stern
- Department
of Chemistry and the Materials Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Mark A. Ratner
- Department
of Chemistry and the Materials Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Tobin J. Marks
- Department
of Chemistry and the Materials Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
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Witzens J, Baehr-Jones T, Hochberg M. Design of transmission line driven slot waveguide Mach-Zehnder interferometers and application to analog optical links. OPTICS EXPRESS 2010; 18:16902-16928. [PMID: 20721082 DOI: 10.1364/oe.18.016902] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Slot waveguides allow joint confinement of the driving electrical radio frequency field and of the optical waveguide mode in a narrow slot, allowing for highly efficient polymer based interferometers. We show that the optical confinement can be simply explained by a perturbation theoretical approach taking into account the continuity of the electric displacement field. We design phase matched transmission lines and show that their impedance and RF losses can be modeled by an equivalent circuit and linked to slot waveguide properties by a simple set of equations, thus allowing optimization of the device without iterative simulations. We optimize the interferometers for analog optical links and predict record performance metrics (V(pi) = 200 mV @ 10 GHz in push-pull configuration) assuming a modest second order nonlinear coefficient (r(33) = 50 pm/V) and slot width (100 nm). Using high performance optical polymers (r(33) = 150 pm/V), noise figures of state of the art analog optical links can be matched while reducing optical power levels by approximately 30 times. With required optical laser power levels predicted at 50 mW, this could be a game changing improvement by bringing high performance optical analog link power requirements in the reach of laser diodes. A modified transmitter architecture allows shot noise limited performance, while reducing power levels in the slot waveguides and enhancing reliability.
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Affiliation(s)
- Jeremy Witzens
- Department of Electrical Engineering, University of Washington, Campus Box 352500 Seattle, WA 98195-2500, USA.
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Frattarelli D, Schiavo M, Facchetti A, Ratner MA, Marks TJ. Self-assembly from the gas-phase: design and implementation of small-molecule chromophore precursors with large nonlinear optical responses. J Am Chem Soc 2009; 131:12595-612. [PMID: 19722717 DOI: 10.1021/ja900131y] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Efficiently organizing molecular nonlinear optical (NLO) chromophores having large first-order hyperpolarizabilities (beta) into acentric microstructures for electro-optic (EO) applications represents a significant materials synthesis and processing challenge, in part due to interchromophore dipolar interactions that promote centrosymmetric organization. Here we report the computational modeling, synthesis, and characterization of a series of eight heteroaromatic organic chromophores, designed to self-organize from the vapor phase via directed hydrogen-bond networks, into acentric thin films. Introduction of alpha,omega-donor-acceptor hydrogen-bonding substituents along the molecular long axes tunes properties such as hyperpolarizability, volatility, thermal stability, film-forming properties, and macroscopic NLO response (chi((2))). DFT-level molecular modeling, INDO/S optical property analysis, and sum-overstates computation indicate that molecular-core fluorination and hydrogen-bond donor incorporation can increase beta(vec) up to 40x versus that of typical fluorine-free chromophores. Furthermore, inclusion of sterically induced biphenyl conjugative decoupling between chromophore pi-donor substituents and the hydrogen-bonding donor sites increases beta by approximately 50%. Experimental thin-film second harmonic generation (SHG) spectroscopy confirms these trends in calculated responses, with chi((2)) increasing 7.5x upon chromophore core fluorination and 15x with hydrogen-bonding donor substitution, thereby achieving macroscopic responses as high as 302 pm/V at omega(o) = 1064 nm. In addition to response trends, cluster calculations also reveal linear additivity in beta(vec) with catenation for all benzoic acid-containing chromophores up to longitudinally aligned trimers. Linear scaling of SHG response with film thickness is observed for benzoic acid-containing chromophores up to 1.0 microm film thickness.
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Affiliation(s)
- David Frattarelli
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, USA
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Kim WK, Kwon SW, Jeong WJ, Son GS, Lee KH, Choi WY, Yang WS, Lee HM, Lee HY. Integrated optical modulator for signal up-conversion over radio-on-fiber link. OPTICS EXPRESS 2009; 17:2638-2645. [PMID: 19219167 DOI: 10.1364/oe.17.002638] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
An integrated optical modulator, which consists of a dual-sideband suppressed carrier (DSB-SC) modulator cascaded with a single-sideband (SSB) modulator, is proposed for signal up-conversion over Radio-on-Fiber. Utilizing a single-drive domain inverted structure in both modulators, balanced modulations were obtained without complicated radio frequency (RF) driving circuits and delicate RF phase adjustments. Intermediate frequency (IF) band signal was up-conversed to 60GHz band by using the fabricated device and was transmitted over optical fiber. Experiment results show that the proposed device enables millimeter wave generation and signal transmission without any power penalty caused by chromatic dispersion.
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Affiliation(s)
- Woo-Kyung Kim
- Korea Electronics Technology Institute, 68 Yatap-dong, Bundang-gu, Seongnam-si, Gyeonggi-do, Korea.
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Janner D, Tulli D, Belmonte M, Pruneri V. Waveguide electro-optic modulation in micro-engineered LiNbO3. ACTA ACUST UNITED AC 2008. [DOI: 10.1088/1464-4258/10/10/104003] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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