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Chinese Science Bulletin

, Volume 55, Issue 35, pp 4083–4088 | Cite as

Numerical study of three phase shifts and dual corrugation pitch modulated (CPM) DFB semiconductor lasers based on reconstruction equivalent chirp technology

  • YueChun ShiEmail author
  • XingHua Tu
  • SiMin Li
  • YaTing Zhou
  • LingHui Jia
  • XiangFei ChenEmail author
Article Optoelectronics

Abstract

A distributed feedback (DFB) semiconductor laser with three phase shifts based on reconstruction equivalent chirp (REC) technology is proposed and investigated numerically. With the combination of multiple phase shifts and corrugation pitch modulated (CPM) structure, we also propose a novel and more complex structure named dual CPM, which has a flatter light power distribution along the laser cavity compared with the true double phase shifts DFB laser diode (LD), while the P-I curves are nearly the same. The proposed dual CPM structure is also designed and analyzed based on REC technology. The simulation results show that, the DFB semiconductor laser with complex structure such as phase shifts, or even arbitrary variation of the grating period can be achieved equivalently and easily by changing the sampling structure. But its external characteristics are almost the same as those DFB lasers with true phase shifts, or true arbitrary variation of the grating period. The key advantage of the REC technology is that it varies only the sampling structure and keeps the seed grating (actual grating in sampling structure) period constant. So its fabrication needs only low-cost and standard holographic exposure technology. Therefore we believe this method can achieve the high-end and low-cost DFB LD for mass production.

Keywords

semiconductor laser distributed feedback (DFB) multiple phase shifts corrugation pitch modulated (CPM) reconstruction equivalent chirp (REC) 

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Copyright information

© Science China Press and Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  1. 1.Microwave-Photonics Technology Laboratory, National Laboratory of MicrostructuresNanjing UniversityNanjingChina
  2. 2.Department of Electronic Science and EngineeringNanjing UniversityNanjingChina
  3. 3.Microfluidics and Optics Technology Research Center, College of Opto-Electronic EngineeringNanjing University of Posts and TelecommunicationNanjingChina

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