Design of broadband LP₀₁↔LP₀₂ mode converter based on special dual-core fiber for dispersion compensation

Abstract

A novel broadband LP01↔LP02 mode converter for dispersion compensation based on special dual-core fiber is theoretically investigated by using the coupled-mode theory. The simulated mode converter has ∼22 nm bandwidth with a conversion efficiency of over 80%. Furthermore, this noncomplete conversion only introduces the insertion loss rather than multipath interference resulting from the residual LP01 mode. Finally, one optimal scheme for broadening the bandwidth of high-efficiency conversion has been proposed by longitudinally tapering the dual-core fiber. The simulation results show that the conversion bandwidth can be improved to ∼31 nm by tapering with a scaling range of only 2%.

A tunable polarization-independent comb filter based on high-order mode fiber

“…the fundamental mode LP 01 and the higher-order mode LP 02 . The other high-order modes including LP 11 are cut off at the operating wavelength [10][11][12]. The construction of the HOMF-based filter is shown in figure 1.…”

Asymmetric dual-core liquid crystal channel-based tunable mode converter

“…Intermodal coupling in asymmetric dual-core photonic crystal fibers (ADC-PCF) has recently been reported and studied in the context of mode conversion 27 – 30 . Lin et al 27 have introduced an LP 01 to LP 02 mode converter based on a unique DC-PCF for dispersion adjustment. With a bandwidth of 22 nm at λ = 1.55 μm, the reported device in 27 achieves 80% coupling efficiency.…”

“…Lin et al 27 have introduced an LP 01 to LP 02 mode converter based on a unique DC-PCF for dispersion adjustment. With a bandwidth of 22 nm at λ = 1.55 μm, the reported device in 27 achieves 80% coupling efficiency. Additionally, the simulation results revealed that the bandwidth is increased to 31 nm 27 by tapering the dual-core PCF.…”

Tunable Mode Converter Device Based on Photonic Crystal Fiber with a Thermo-Responsive Liquid Crystal Core

“…To solve this problem, several alternatives based on optical fiber technology had been explored in the past, such as FBGs, LPFGs, tapered fibers and applying lateral pressure [13][14][15][16]. Recently, schemes of mode conversion based on modal coupling in asymmetric dual-core optical fibers have been proposed [17][18][19][20][21]. Cheng et al numerically analyzed the mode coupling between a large core and a small core in an asymmetric, dual-core photonic crystal fiber (PCF), reporting a LP 01 to LP 02 mode converter with a bandwidth of 14 nm and a length of 12.7 mm; it operates at around 1550 nm [17].…”

“…They reported a photonic device with a 22 nm bandwidth and a coupling efficiency of up to 80% when operating at around 1550 nm. In addition, the simulation results showed that the conversion bandwidth can be improved to ≈31 nm by tapering the dual-core fiber [18]. Cai et al proposed a scheme of mode conversion based on mode coupling in a hybrid dual-core PCF, which contains an index-guided core and a photonic bandgap core.…”