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Single and triple output coherence‐free microwave photonic filter using a 3 × 3 collinear coupler in a Sagnac fiber loop
Author(s) -
Ning G.,
Shum P.,
Zhou J.
Publication year - 2008
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.23218
Subject(s) - sagnac effect , interferometry , physics , optics , microwave , coherence (philosophical gambling strategy) , photonics , band stop filter , filter (signal processing) , engineering , electrical engineering , low pass filter , quantum mechanics
New structures that can realize single and triple output coherence‐free microwave photonic filter are presented. They are based on a Sagnac loop interferometer containing a single drive intensity modulator and a 3 × 3 collinear coupler, and no non‐reciprocal bias unit is required. Notch responses are obtained by modulating the clockwise and counterclockwise propagating waves inside the Sagnac loop at different times. Theoretical analysis is obtained for both DFB laser source and broad‐band source. Measured results verify the theoretical expressions and demonstrate robust notch filter responses. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 744–747, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23218