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Tunable and switchable microwave photonic filter using a semiconductor optical amplifier in a Sagnac fiber loop

G. NING1,* , S. ADITYA1, L. H. CHENG1, J. ZHOU1, P. SHUM1, LE NGUYEN BINH2

Affiliation

  1. School of Electrical & Electronic Engineering, Nanyang Technological University, Singapore
  2. Electrical & computer systems engineering PO Box 35, Monash University

Abstract

A tunable and switchable coherence-free microwave photonic filter configuration is presented. This all-optical structure realizes filters with capability of switching between bandpass and low pass response. It is based on a Sagnac fiber loop interferometer containing a phase modulator and a semiconductor optical amplifier (SOA) with high-birefringence (Hi-Bi) pigtails. The SOA generates a phase difference between the clockwise and counterclockwise propagating waves inside the Sagnac fiber loop interferometer, together with compensating the insertion loss of the Sagnac loop. Measured results confirm the theoretical expressions and demonstrate a robust switchable notch filter response.

Keywords

Microwave photonic, Semiconductor optical amplifier (SOA), Switchable filter, Sagnac loop.

Citation

G. NING, S. ADITYA, L. H. CHENG, J. ZHOU, P. SHUM, LE NGUYEN BINH, Tunable and switchable microwave photonic filter using a semiconductor optical amplifier in a Sagnac fiber loop, Optoelectronics and Advanced Materials - Rapid Communications, 2, 5, May 2008, pp.274-277 (2008).

Submitted at: March 22, 2008

Accepted at: May 8, 2008