Performance of Traveling-Wave Electroabsorption Modulators Depending on Microwave Properties of Waveguides Calculated Using the FDTD Method

Seungki Nam; Yonggyoo Kim; Jaehoon Lee; Moonil Kim; Jichai Jeong

doi:10.1109/JSTQE.2003.818847

Performance of Traveling-Wave Electroabsorption Modulators Depending on Microwave Properties of Waveguides Calculated Using the FDTD Method

Seungki Nam, Yonggyoo Kim, Jaehoon Lee, Moonil Kim, Jichai Jeong

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

We present a method to analyze electrical and optical characteristics of traveling-wave electroabsorption modulators (TW-EAMs) using the finite-difference time-domain method. We consider the interaction between electromagnetic fields and optical powers in waveguides in time domain to model electrical and optical behaviors of TW-EAMs. The effects of microwave properties of waveguides on modulation response and output optical power of TW-EAMs are analyzed by the proposed method. The characteristic impedance of TW-EAMs is more important than microwave index to obtain large modulation bandwidth of TW-EAMs when impedance matching techniques are not used. However, effective refractive index match between microwave and lightwave becomes important as the waveguide length increases. The microwave property closely related to the extinction ratio of output optical powers is the microwave loss. When impedance match is achieved by low-impedance termination, the velocity matching between microwave and lightwave becomes important.

Original language	English
Pages (from-to)	763-769
Number of pages	7
Journal	IEEE Journal on Selected Topics in Quantum Electronics
Volume	9
Issue number	3
DOIs	https://doi.org/10.1109/JSTQE.2003.818847
Publication status	Published - 2003 May

Keywords

Electroabsorption
Finite-difference time-domain (FDTD) method
Traveling-wave modulator

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Electrical and Electronic Engineering

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10.1109/JSTQE.2003.818847

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title = "Performance of Traveling-Wave Electroabsorption Modulators Depending on Microwave Properties of Waveguides Calculated Using the FDTD Method",

abstract = "We present a method to analyze electrical and optical characteristics of traveling-wave electroabsorption modulators (TW-EAMs) using the finite-difference time-domain method. We consider the interaction between electromagnetic fields and optical powers in waveguides in time domain to model electrical and optical behaviors of TW-EAMs. The effects of microwave properties of waveguides on modulation response and output optical power of TW-EAMs are analyzed by the proposed method. The characteristic impedance of TW-EAMs is more important than microwave index to obtain large modulation bandwidth of TW-EAMs when impedance matching techniques are not used. However, effective refractive index match between microwave and lightwave becomes important as the waveguide length increases. The microwave property closely related to the extinction ratio of output optical powers is the microwave loss. When impedance match is achieved by low-impedance termination, the velocity matching between microwave and lightwave becomes important.",

keywords = "Electroabsorption, Finite-difference time-domain (FDTD) method, Traveling-wave modulator",

author = "Seungki Nam and Yonggyoo Kim and Jaehoon Lee and Moonil Kim and Jichai Jeong",

note = "Funding Information: Manuscript received November 22, 2002; revised July 1, 2003. This work was supported in part by the University Research Program supported by the Ministry of Information and Communication, and in part by the NRL program in South Korea. The authors are with the Department of Radio Engineering, Korea University, Seoul 136-701, Korea. Digital Object Identifier 10.1109/JSTQE.2003.818847",

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doi = "10.1109/JSTQE.2003.818847",

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AU - Nam, Seungki

AU - Kim, Yonggyoo

AU - Lee, Jaehoon

AU - Kim, Moonil

AU - Jeong, Jichai

N1 - Funding Information: Manuscript received November 22, 2002; revised July 1, 2003. This work was supported in part by the University Research Program supported by the Ministry of Information and Communication, and in part by the NRL program in South Korea. The authors are with the Department of Radio Engineering, Korea University, Seoul 136-701, Korea. Digital Object Identifier 10.1109/JSTQE.2003.818847

PY - 2003/5

Y1 - 2003/5

N2 - We present a method to analyze electrical and optical characteristics of traveling-wave electroabsorption modulators (TW-EAMs) using the finite-difference time-domain method. We consider the interaction between electromagnetic fields and optical powers in waveguides in time domain to model electrical and optical behaviors of TW-EAMs. The effects of microwave properties of waveguides on modulation response and output optical power of TW-EAMs are analyzed by the proposed method. The characteristic impedance of TW-EAMs is more important than microwave index to obtain large modulation bandwidth of TW-EAMs when impedance matching techniques are not used. However, effective refractive index match between microwave and lightwave becomes important as the waveguide length increases. The microwave property closely related to the extinction ratio of output optical powers is the microwave loss. When impedance match is achieved by low-impedance termination, the velocity matching between microwave and lightwave becomes important.

AB - We present a method to analyze electrical and optical characteristics of traveling-wave electroabsorption modulators (TW-EAMs) using the finite-difference time-domain method. We consider the interaction between electromagnetic fields and optical powers in waveguides in time domain to model electrical and optical behaviors of TW-EAMs. The effects of microwave properties of waveguides on modulation response and output optical power of TW-EAMs are analyzed by the proposed method. The characteristic impedance of TW-EAMs is more important than microwave index to obtain large modulation bandwidth of TW-EAMs when impedance matching techniques are not used. However, effective refractive index match between microwave and lightwave becomes important as the waveguide length increases. The microwave property closely related to the extinction ratio of output optical powers is the microwave loss. When impedance match is achieved by low-impedance termination, the velocity matching between microwave and lightwave becomes important.

KW - Electroabsorption

KW - Finite-difference time-domain (FDTD) method

KW - Traveling-wave modulator

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Performance of Traveling-Wave Electroabsorption Modulators Depending on Microwave Properties of Waveguides Calculated Using the FDTD Method

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Keywords

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