Project 24: Mode Restruction in Few Mode Fiber Using Digital Holography

Contact Information:

Asso. Prof. Qingwen Liu

Email: liuqingwen@sjtu.edu.cn

Project Description and Objectives:

Few mode fibers (FMF) can transmit several individual modes. The cross-talk between modes is very weak and each mode can carry information. Therefore, FMF can realize high-density information transmission. The modes of the FMF overlap in space and time and the information of each mode cannot be directly detected. In this project, holographic technology will be used to obtain the intensity and phase information of the output light field of the FMF, and then each mode of the FMF can be separated and reconstructed by calculation.

Eligibility Requirements:

Basic understanding of photonics, fiber optics.

Main Tasks:

Study the basics of few mode fibers and figure out the intensity and phase distribution of each mode.

Learn the principle of holography technology, and recover the wave front of one single mode using the holography figure captured by the digital camera.

Setup the system and realize the coherent detection through the digital camera with a reference beam.

Learn how to recover all the modes from the few mode fibers, and compare the shape of the recovered mode with the theoretical modes in few mode fiber.

Website:

Lab: http://cip.sjtu.edu.cn