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G. S. KLIROS1,*
Fiber couplers are widely used as passive optoelectronic devices. The effective power coupling and transmitting from one fiber core to another is mainly described by both coupling coefficient and beat length. Beat length can be calculated directly from coupling coefficient which depends upon the refractive index profile and fiber core separation. In this communication, we theoretically analyze the properties of thermally diffused expanded core (TEC) fiber couplers. The coupling coefficient and beat length have been calculated using coupled-mode theory. Both the refractive index profile change and wavelength dependence of the coupling properties have been investigated. Our results show that the beat length of TEC-couplers can be reduced to millimeter range by an appropriate selection of refractive index difference, core size expansion due to thermal heating and core separation. Moreover, the coupling coefficient shows a less wavelength dependence in the case of TECcouplers than in conventional SI-SMF couplers. TEC-couplers have a very short beat length even at large fiber-core separations which is very advantageous for integrated optics applications..
Thermally expanded core fiber, Coupling length, Coupling coefficient, Coupled mode theory.
G. S. KLIROS, Coupling coefficient of thermally diffused expanded core fiber couplers, Optoelectronics and Advanced Materials - Rapid Communications, 5, 3, March 2011, pp.193-197 (2011).
Submitted at: Jan. 6, 2011
Accepted at: March 16, 2011
Optoelectronics and Advanced Materials - Rapid Communications
(2023): 0.5 - 2023 Journal Citation Reports (Clarivate Analytics, 2024)
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