Design of ultra-broad-band LiNbO/sub 3/ optical modulators with ridge structure

Mitomi, O.; Noguchi, Kazuhiro; Miyazawa, H.

doi:10.1109/22.414565

Cited by 73 publications

(39 citation statements)

References 10 publications

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“…It is confirmed that the metallization undercutting increases the half-wavelength voltage. The value of is also evaluated via (6), where the overlap integral factor is given by (40) with being the optical power distribution. In the structure considered here, the results of (6) are approximately with those of (5).…”

Section: Numerical Resultsmentioning

confidence: 99%

“…The half-wavelength voltage can also be approximated as (6) where and are the overlap integral factors between the microwave electric field and the optical power distribution for optical waveguides 1 and 2, respectively. In the conventional design of TW optical modulators, the half-wavelength voltage has been evaluated via (6) because, in general, it is very cumbersome to analyze the modified waveguide with electrooptic induced changes in the refractive index.…”

Section: Optical Response and Half-wavelength Voltagementioning

confidence: 99%

“…For this purpose, various numerical techniques have been developed. In particular, the finite-element method (FEM) is a powerful and efficient tool for the most general waveguiding problems and has been widely used for modeling and optimization of the TW electrode [1]- [6]. The conventional FEM approach, however, is based on a quasi-TEM approximation and, thus, the frequency dispersion of a microwave effective index, characteristic impedance, and attenuation constant, which are key parameters for realizing high-speed optical modulators, cannot be evaluated.…”

Section: Introductionmentioning

confidence: 99%

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Finite-element modeling of broad-band traveling-wave optical modulators

Koshiba

Tsuji

Nishio

1999

IEEE Trans. Microwave Theory Techn.

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Abstract-A full-wave finite-element method with hybrid edge/ nodal elements is, for the first time, applied to investigating the frequency dispersion of microwave propagation characteristics of broad-band traveling-wave (TW) optical modulators using planar electrode configurations. In order to produce a two-step analysis of electrooptic modulation of optical waveguides, the microwave electrode solver is linked to the optical waveguide solver. Numerical results are shown for an ultrabroad-band TW LiNbO 3 Mach-Zehnder optical modulator with a ridge structure, and the necessity of using the full-wave solver is verified by comparing the calculated 3-dB bandwidth and half-wavelength voltage with the experimental data.Index Terms-Coplanar waveguide, finite-element method, fullwave analysis, microwave photonic device, traveling-wave optical modulator.

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Section: Numerical Resultsmentioning

confidence: 99%

Section: Optical Response and Half-wavelength Voltagementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Finite-element modeling of broad-band traveling-wave optical modulators

Koshiba

Tsuji

Nishio

1999

IEEE Trans. Microwave Theory Techn.

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“…Theoretical studies have been carried out with the aim of finding the best cross-section designs which provide low voltage as well as velocity matching [36,37]. Calculated results showed that ridge modulators in LiNbO 3 are able to reach simultaneous velocity and impedance matching operating in the range of 30 to 40 GHz [17,30].…”

Section: Device Structuresmentioning

confidence: 98%

Micro‐structured integrated electro‐optic LiNbO₃ modulators

Janner¹,

Tulli

Garcia-Granda

et al. 2009

Laser & Photonics Reviews

151

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In this paper, we will review the state-of-the-art of LiNbO3 based integrated electro-optic modulators and will show how micro-structuring techniques such as etching, domain inversion and thin film processing can be used to realize new configurations which can take the performance to unprecedented levels. In particular, we will review recent results on the use of domain inversion on a micron scale and we report on the fabrication of a chirp-free modulator having ∼ 2 V switching voltage and bandwidth of 15 GHz designed by placing the waveguide arms of the Mach-Zehnder interferometer in opposite domain oriented regions. We also review some of the new modulation formats (e.g. DQPSK) that can represent an application development of the presented micro-structured devices. Finally, we address the issue of the integration of the modulator chip in a transmitter board comprising tunable laser, bias-control electronics and RF driver. The requirements of integration can even push further the reduction in size of modulator chips, thus making more crucial the use of micro-and nano-structuring techniques.Mach-Zehnder modulator exploiting domain inversion for ultralow voltage operation.

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“…Estos índices son parámetros constructivos que permiten obtener una frecuencia máxima de trabajo cuando están bien adaptados, lo cual se consigue variando parámetros de construcción del MZM como se propone en [Mit95]. Otra posibilidad de aumentar la frecuencia máxima de trabajo es acortar la longitud de los electrodos, pero este procedimiento requiere tensiones de polarización mayores.…”

Section: Parámetros Característicosunclassified

Coexistencia e integración de comunicaciones inalámbricas en sistemas de transmisión ópticos.

Soler¹

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IVPersonal Area Network). L'objectiu d'aquest estudi és obtenir màrges de seguretat per a garantir la interoperatibilitat d'ambdues tecnologies ràdio, els quals es poden aplicar en el futur desenvolupament de tècniques avançades de mitigació de la interferència com detecció i exclusió (DAA, Detect-and-Avoid), dins de futures aplicacions com les anomenades cognitive radio.Després, s'estudia la coexistència de MB-OFDM UWB i WiMAX IEEE 802.16e en xarxes òptiques d'accés basades en sistemes RoF. S'avaluen dos escenaris experimentals: en el primer, s'avalua un sistema RoF amb fibra multimode, i el segon, un sistema RoF amb fibra monomode. Els resultats permeten obtenir màrges de seguretat i abast màxim per al desplegament de sistemes RoF segons els tipus de fibra. Al mateix temps, es demostra i avalua experimentalment una nova tècnica de multiplexació per divisió en polarització de la transmissió òptica, per a millorar la coexistència en sistemes RoF.Finalment, aquesta Tesi Doctoral presenta l'estudi del modulador electro-òptic Mach-Zehnder, com a peça clau que limita el marge dinàmic de les transmissions als sistemes RoF. Al mateix temps, es proposa i avalua experimentalment una tècnica òptica de linealització del modulador Mach-Zehnder que millora el marge dinàmic del sistema RoF. V AbstractCurrent network and telecommunication systems are required to provide higher data rates in access networks to an increasing number of users. This fact is mainly due to the increase in the Internet traffic data, which is related with the higher demand of online videogames and software, the increased complexity in the content of web pages, the joint distribution of audio-visual and added-value online content, and the introduction of high-definition services and contents such as video on demand, as a result of a society increasingly more interconnected. In order to satisfy these higher data rates requirements, new techniques for the joint distribution of several wireless communication systems are proposed in this Thesis. The aim of these techniques is to facilitate the deployment of an integrated access network at the customer premises, enabling the integration of optical transmission over an optical access network and radio-frequency transmission in the same infrastructure.Two main wireless communication systems are considered in this Thesis, WiMAX (Worldwide Interoperability for Microwave Access) and UWB (Ultra-Wide Band) according to WiMedia Alliance recommendation. Comparing the bit rate and expected range, WiMAX and UWB are complementary radio technologies expected to coexist in a near future in integrated access networks. The optical access network considered in this Thesis can be regarded as a FTTH network (Fibre-to-the-Home). The wireless signals are natively transmitted over optical network, that is, without frequency upconversion and remodulation stages, over one or several optical carriers. This technology, which is known as Radio-over-Fibre (RoF), is well suited for integrated access networks.First, the requirements for...

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Design of ultra-broad-band LiNbO/sub 3/ optical modulators with ridge structure

Cited by 73 publications

References 10 publications

Finite-element modeling of broad-band traveling-wave optical modulators

Finite-element modeling of broad-band traveling-wave optical modulators

Micro‐structured integrated electro‐optic LiNbO₃ modulators

Coexistencia e integración de comunicaciones inalámbricas en sistemas de transmisión ópticos.

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Design of ultra-broad-band LiNbO/sub 3/ optical modulators with ridge structure

Cited by 73 publications

References 10 publications

Finite-element modeling of broad-band traveling-wave optical modulators

Finite-element modeling of broad-band traveling-wave optical modulators

Micro‐structured integrated electro‐optic LiNbO3 modulators

Coexistencia e integración de comunicaciones inalámbricas en sistemas de transmisión ópticos.

Contact Info

Product

Resources

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Micro‐structured integrated electro‐optic LiNbO₃ modulators