Technical Briefs

Optimization of Microwave Packaging Structure for Directly Modulated Laser Modules Using Three-Dimensional Electromagnetic Model

[+] Author and Article Information
Wei Han, Marc Rensing, Peter O’Brien

 Integrated Photonics Group, Tyndall National Institute, Cork, Ireland

Frank H. Peters

Integrated Photonics Group,  Tyndall National Institute, Cork, Ireland; Department of Physics,  University College Cork, Cork, Ireland

J. Electron. Packag 133(4), 044502 (Dec 09, 2011) (4 pages) doi:10.1115/1.4005292 History: Received October 11, 2010; Revised August 31, 2011; Published December 09, 2011; Online December 09, 2011

In this paper, the packaging aspects of directly modulated laser (DML) modules are investigated using detailed electromagnetic (EM) simulations. The packaging influences of the laser module are specified in two parts as RF connector and optoelectronic subsystem. By carefully optimizing the package structure, the simulation results show that the insertion loss of the proposed module is less than 1 dB up to 40 GHz. Then, a DML module is packaged and measured based on the optimized package scheme. A resonance free bandwidth of approximately 20 GHz is obtained with a 3 dB bandwidth of about 15 GHz.

Copyright © 2011 by American Society of Mechanical Engineers
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Figure 1

EM model of the BTF package including the RF connector and glass bead

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Figure 2

Assembly of RF connector and glass bead

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Figure 3

Simulated reflection (S11 ) with different (a) ratios of D2/D1 and (b) air gap values

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Figure 4

Assembly structure for the optoelectronic subsystem

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Figure 5

(a) S21 and S11 of the MSL with different linewidths and (b) influence of the Au wire on reflection

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Figure 6

Section plane of the RF signal transmission path

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Figure 7

(a) Resonances due to the improper optoelectronic subsystem assembly, and (b) results with optimization

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Figure 8

Packaged laser module based on the optimized simulation results

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Figure 9

(a) Measured S21 of DML module with and without optimization and (b) measured S11 with different Au wire lengths




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