First Demonstration of a Broadband 37-cell Hollow Core Photonic Bandgap Fiber and Its Application to High Capacity Mode Division Multiplexing (original) (raw)
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Mode Multiplexing at 2×20Gbps over 19-cell Hollow-Core Photonic Band Gap Fibre
National Fiber Optic Engineers Conference, 2012
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Optics Express, 2013
The first demonstration of a hollow core photonic bandgap fiber (HC-PBGF) suitable for high-rate data transmission in the 2 µm waveband is presented. The fiber has a record low loss for this wavelength region (4.5 dB/km at 1980 nm) and a >150 nm wide surface-mode-free transmission window at the center of the bandgap. Detailed analysis of the optical modes and their propagation along the fiber, carried out using a time-of-flight technique in conjunction with spatially and spectrally resolved (S 2) imaging, provides clear evidence that the HC-PBGF can be operated as quasi-single mode even though it supports up to four mode groups. Through the use of a custom built Thulium doped fiber amplifier with gain bandwidth closely matched to the fiber's low loss window, error-free 8 Gbit/s transmission in an optically amplified data channel at 2008 nm over 290 m of 19 cell HC-PBGF is reported.
Hollow Core Photonic Bandgap fibers for Telecommunications: Opportunities and Potential Issues
2012
The continuing exponential rise in demand for communications bandwidth provides a pressing need to find new solutions for increasing the overall capacity of optical fiber links. Coherent systems based on conventional fiber technology are already operating close to fundamental capacity and fiber loss limits. Consequently, radical new solutions including various forms of spatial division multiplexing (SDM) are currently under heavy investigation.
2012
Hollow core-photonic bandgap fibers (HC-PBGFs) have many intriguing properties including ultralow nonlinearity and low latency relative to conventional (solid) forms of optical fiber. As a consequence they are of great interest as a potential transmission medium in next-generation optical communication systems. However, in order to have any chance of competing with conventional transmission fibers, the possibility of achieving low loss over a suitably extended bandwidth needs to be demonstrated.
Classification of the Core Modes of Hollow-Core Photonic-Bandgap Fibers
IEEE Journal of Quantum Electronics, 2000
Using a new full-vectorial finite-difference mode solver utilizing a hexagonal Yee's cell, we calculated the dispersion diagram of a slightly multimode (16 modes) air-core photonic-bandgap fiber (PBF) and the electric-field profiles of all of its core modes. Careful comparison shows striking similarities between these properties and those of the hybrid modes of a conventional step-index fiber, in terms of the modes' field profiles, the modes' degeneracy, the order in which the modes mode cut off in the wavelength space, and the maximum number of modes. Based on these similarities, we propose for the first time a systematic nomenclature for the modes of a PBF, namely hybrid HE and EH modes and of quasi-TE and quasi-TM modes. Other small but relevant similarities and differences between the modes of these two types of fibers are also discussed.