Hollow core photonic band gap optical fiber for 3-5-micrometer wave band optical wave broadband low-loss transmission
A photonic bandgap and optical fiber technology, applied in the field of hollow-core photonic bandgap fibers, can solve the problems of discontinuous low-loss transmission window, unfavorable low-loss transmission, large mode transmission loss, etc. Band gap range, effect of reducing transmission loss
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Embodiment 1
[0027] Compared with the previous cladding based on the binary structure period, the hollow-core photonic bandgap fiber multi-layer dielectric structure cladding layer 5 used in the present invention for 3-5 micron band light wave broadband low-loss transmission is based on the ternary structure period 6, When taking the same optical fiber structure parameters, it has higher reflectivity to the incident light wave in the hollow fiber core, so lower leakage loss can be obtained.
[0028] Such as Figure 4 Shown is a conventional multi-layer dielectric structure cladding 5 (that is, only a single dielectric layer group, ) based on the fundamental mode in the hollow-core photonic bandgap fiber based on the binary structure period and the ternary structure period respectively ( mode) leakage loss curve. The leakage loss is calculated by the ray optics method, and the period value and number in the cladding layer 5 of the multilayer dielectric structure are respectively nm an...
Embodiment 2
[0030] Take the multi-layer dielectric structure cladding 5 to be made up of two dielectric layer groups, namely , each dielectric layer group contains 15 ternary structure periods, namely , the period value in the media layer group inside the two media layer groups is nm, the period value in the outer dielectric layer group is nm.
[0031] In order to illustrate that the optical fiber structure design proposed by the present invention can effectively expand the photonic bandgap bandwidth, as Figure 5 As shown, this embodiment focuses on the change of the omnidirectional reflection photonic band gap.
[0032] The reflection spectrum of the cladding of the above structure to the incident TM wave at different angles can be calculated by using the transfer matrix method, as shown in Figure 5 (a) shown. As a comparison, Figure 5 (b) Correspondingly, the conventional multi-layer dielectric structure cladding with the period number of 30 is given (ie , nm) Reflectio...
Embodiment 3
[0034] Although in the prior art, the photonic bandgap expansion can also be realized by adopting the binary structure period of each dielectric layer group, but due to Figure 4 For the reasons shown, its leakage loss is greater than that of the hollow-core photonic bandgap fiber based on the periodic cladding of the ternary structure according to the present invention. Such as Figure 6 Shown is the same media layer group number ( ), the number of cycles ( ) and size ( nm, nm), and the hollow core radius ( μm), the fundamental mode in the large-diameter hollow-core photonic bandgap fiber based on the binary structure period and the ternary structure period ( mode) leakage loss curve. Depend on Figure 6 It can be seen that although the omnidirectional reflection bandgaps of the two structural fibers are almost the same (as shown by the line segment AB), the leakage loss of the former is significantly greater than that of the latter within the scope of the omnid...
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