Abstract
An all-solid dispersion-compensating photonic crystal fiber based on mode coupling mechanism in dual-concentric core has been proposed. The mode coupling characteristics, dispersion, confinement loss of the fiber, and the influence on dispersion of some structure parameters are simulated by full-vector finite element method. By using the relationship between phase matching wavelengths and coupling strength with the change of fiber microstructure parameters, an all-solid dual-concentric-core dispersion-compensating photonic crystal fiber is presented. The structure parameters on dispersion characteristic are investigated. The results demonstrate that the proposed fiber has a large negative dispersion value 8465 ps/(nm·km) at 1550 nm. The effective mode area and the splicing loss to the standard single mode fiber are 12.8 μm2 and 1.89 dB at 1550 nm, respectively. At 1550 nm, the confinement loss is less than 1 × 10−3 dB/km and the bending loss with 2 cm bending diameter is less than 1 × 10−2 dB/km.
Highlights
In modern high-speed optical fiber communication system, the cumulative dispersion in transmission process is the main factor limiting the communication rate [1]. erefore, the dispersion compensation for high-speed optical fiber communication system has become a hot research topic
Birks et al got the dispersion compensation photonic crystal fiber (DCPCF) for the negative dispersion value as −2000 ps/(nm·km) at 1550 nm by using control effect of large air hole and small fiber core on light to increase the influence of waveguide dispersion [4]
Gerome et al proposed the structure of dual-concentric-core dispersioncompensating photonic crystal fiber (DCC-DCPCF) [5] and used the mode coupling mechanism of dual-concentric-core (DCC) to obtain the large negative dispersion
Summary
In modern high-speed optical fiber communication system, the cumulative dispersion in transmission process is the main factor limiting the communication rate [1]. erefore, the dispersion compensation for high-speed optical fiber communication system has become a hot research topic. Photonic crystal fiber (PCF) cladding contains a lot of micro air holes with periodic or disordered distribution Because of this special structure, this kind of fiber has a high degree of design freedom, and it can flexibly adjust the dispersion characteristics of fiber [2]. The design and realization of dispersion compensation characteristics by using microstructural fiber are mostly based on the mode coupling mechanism of DCC [6,7,8,9]; the transmission mode between the inner and outer core is regulated to achieve the conversion of light energy between the inner and outer core, so as to flexibly adjust the dispersion compensation characteristics of the optical fiber. The all-solid structure provides a more friendly process for both fabricating and splicing; the designed allsolid DCC-DCPCF is fabricated and can access the existing optical network systems
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