Abstract
Current technologies are fast approaching the capacity limit of single mode fibers (SMFs). Hollow-core photonic bandgap fibers (HC-PBGFs) are expected to provide attractive long-term solutions in terms of ultra-low fiber nonlinearities associated with the possibility of mode scaling, thus enabling mode division multiplexing (MDM). In this work, we demonstrate MDM over a HC-PBGF for the first time. Two 10.7 Gbps channels are simultaneously transmitted over two modes of a 30-m long 7-cell HC-PBGF. Bit error ratio (BER) performances below the FEC threshold limit (3.3 × 10(-3)) are shown for both data channels when the two modes are transmitted simultaneously. No power penalty and up to 3 dB power penalty at a BER of 10(-9) are measured for single mode transmission using the fundamental and the LP(11) mode, respectively. The performance of this exploratory demonstration is expected to improve significantly if advanced mode launching and detection methods are used.
Highlights
It has been generally realized that current optical transmission technologies are fast approaching the capacity limit of single mode fibers (SMFs)
Hollow-core photonic bandgap fibers (HCPBGFs) are expected to provide attractive long-term solutions in terms of ultra-low fiber nonlinearities associated with the possibility of mode scaling, enabling mode division multiplexing (MDM)
We demonstrate MDM over a HC-PBGF for the first time
Summary
It has been generally realized that current optical transmission technologies are fast approaching the capacity limit of single mode fibers (SMFs). Hollow-core photonic bandgap fibers (HC-PBGFs) may greatly relieve the impact of nonlinearities by supporting light transmission in air for up to 90% or more of the signal power [8,9,10]. Lower loss can be achieved by increasing the dimension of the air core, resulting in multi-mode operation [8], which can in turn be exploited for MDM. HC-PBGFs can be used for opening new transmission windows around 2 μm where their minimum loss, significantly lower than that of solid-core silica fibers in the same wavelength range, has been theoretically predicted [9,11,12]. The large sensitivity degradation is attributed to the mode de-multiplexing technique, which could be greatly improved by optimizing the detection method
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