ASYMMETRIC FIBER TAPER FOR NARROW LINEWIDTH COMB FILTER

Autor:	N. S. Isa, M. H. Abu Bakar, Mohd Adzir Mahdi, Amirah Abdul Latif, N. H. Mohamed Halip
Rok vydání:	2016
Předmět:	Coupling Materials science Optical fiber Extinction ratio business.industry General Engineering law.invention Laser linewidth Optics Filter (video) law Fiber business Optical filter Comb filter
Zdroj:	Jurnal Teknologi. 78
ISSN:	2180-3722 0127-9696
DOI:	10.11113/jt.v78.7476
Popis:	The employment of asymmetric optical fiber taper as a means for producing narrow linewidth comb filter is proposed and demonstrated. Fiber taper with different values set for the up-taper and down-taper transition regions was used to produce narrow linewidth comb filter through coupling interaction of light in the asymmetric fiber. Two configurations; single-pass and bidirectional fiber taper filters were studied and analyzed in this project. Results showed narrower 3-dB linewidth for asymmetric taper compared with uniform taper for single pass configuration. The asymmetric taper linewidth was improved further in bidirectional configuration, narrowing down to 2 nm. Bidirectional asymmetric taper filter recorded extinction ratio of 27.14 dB, which was 18 dB and 3 dB better than single-pass asymmetric taper and bidirectional uniform taper respectively. The findings emphasize the attractiveness of bidirectional asymmetric taper as a high performance optical filter.
Databáze:	OpenAIRE
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