Leaky-wave photodiodes with a partially p-doped absorption layer and a distributed Bragg reflector (DBR) for high-power and high-bandwidth-responsivity product performance

W. Y. Chiu, J. W. Shi, W. K. Wang, Y. S. Wu, Y. J. Chan, Y. L. Huang, R. Xuan

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

In this letter, we describe a novel edge-coupled photodiode (PD) structure, which can greatly relax the dependence of the responsivity on the cleaved length of an evanescently coupled optical waveguide. The integration of a leaky optical waveguide with a distributed Bragg reflector (DBR) and a partially p-doped photoabsorption layer allows the demonstrated device to exhibit a higher saturation current-bandwidth and responsivity than a control sample without the DBR structure. We achieved excellent speed (40-50 GHz), responsivity (0.8 A/W), and saturation current-bandwidth products (720 mA · GHz at 40 GHz), comparable to the high-performance of an evanescently coupled PD, whose variation of responsivity is more sensitive to the cleaved waveguide length (30% versus 7%) than is our demonstrated device.

Original languageEnglish
Pages (from-to)1267-1269
Number of pages3
JournalIEEE Photonics Technology Letters
Volume18
Issue number11
DOIs
StatePublished - 1 Jun 2006

Keywords

  • Distributed Bragg reflector (DBR)
  • High-power photodiode (PD)
  • Leaky optical waveguide

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