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Small-Signal Power Measuring Technique for Measuring the Frequency Response of Electroabsorption Modulators

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7 Author(s)
Huang, H.P. ; Inst. of Semicond., State Key Lab. on Integrated Optoelectronics, Beijing ; Zhu, N.H. ; Hasen, Q.Q.G. ; Liu, Y.
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We propose and demonstrate measurement of the frequency response of an electroabsorption (EA) modulator using an extended small-signal power measuring technique. In this technique, the modulator is driven by a microwave carrier amplitude modulated by a low-frequency signal, and the modulator frequency response is obtained without the need of a high-speed photodetector. Based upon the nonlinear characteristics of the EA modulator and the underlying principle of the present method, equations have been derived. A measurement scheme using a network analyzer and a low-speed photodetector has been proposed and constructed, and the experimental results confirm that our proposed method is as accurate as the swept-frequency measurement using a network analyzer directly

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Photonics Technology Letters, IEEE  (Volume:18 ,  Issue: 23 )