Stable Transmission of 12 OAM States in Air-Core Fiber

Gregg, Patrick; Kristensen, Poul; Golowich, Steven E.; Olsen, J. O.; Steinvurzel, P.; Ramachandran, Siddharth

doi:10.1364/cleo_si.2013.ctu2k.2

Cited by 65 publications

(44 citation statements)

References 4 publications

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“…2, the best pump family that provides the lowest DMGs (i.e. ~0.25 dB) is OAM (8,1) . In comparison, the calculated DMG is about 3.1 dB when pumped by OAM (0,1) , because the OAM (0,1) pump has a much better overlap with the OAM (5,1) signal mode over the OAM (7,1) signal mode.…”

Section: Core-pumped Operationmentioning

confidence: 99%

“…In comparison, the calculated DMG is about 3.1 dB when pumped by OAM (0,1) , because the OAM (0,1) pump has a much better overlap with the OAM (5,1) signal mode over the OAM (7,1) signal mode. Finally, we present the modal gain spectrum using WDM signals pumped by the OAM (8,1) mode as shown in Fig. 3.…”

Section: Core-pumped Operationmentioning

confidence: 99%

“…Although very low DMG can theoretically be achieved with the OAM (8,1) mode, in practice the excitation of a pure OAM (8,1) pump may be challenging. It is also possible that significant power will couple into other pump modes (for example, OAM (8,2) ) and compromise amplifier performance.…”

Section: Core-pumped Operationmentioning

confidence: 99%

“…It is also possible that significant power will couple into other pump modes (for example, OAM (8,2) ) and compromise amplifier performance. In addition, the insertion loss can potentially be quite high to excite high-order pump modes, such as OAM (8,1) from a single-mode pump diode without the use of high precision or custom components, which makes the OAM EDFA very expensive and less practical. , m) , plotted in order of decreasing mode effective index that of the same "m" group.…”

Section: Core-pumped Operationmentioning

confidence: 99%

“…However, solid-core fibers are typically incapable of transmitting higher-order OAM modes, because either the fiber's effective V-number is not sufficient, or the vector splitting of the higher-order OAM modes becomes small. The second class features an air core and an annular raised-index region that guides light [4,6,8]. The high index-contrast of the air-glass interface enables a large effective-index splitting among the vector (HE/EH) modes of the same |L| family, which significantly reduces the modal crosstalk and allows stable transmission of OAM modes, even for high orders of |L|.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Amplification of 12 OAM Modes in an air-core erbium doped fiber

Kang¹,

Gregg²,

Jung³

et al. 2015

Opt. Express

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Abstract:We theoretically propose an air-core erbium doped fiber amplifier capable of providing relatively uniform gain for 12 orbital angular momentum (OAM) modes (|L| = 5, 6 and 7, where |L| is the OAM mode order) over the C-band. Amplifier performance under core pumping conditions for a uniformly doped core for each of the supported pump modes (110 in total) was separately assessed. The differential modal gain (DMG) was found to vary significantly depending on the pump mode used, and the minimum DMG was found to be 0.25 dB at 1550 nm provided by the OAM (8,1) pump mode. A tailored confined doping profile can help to reduce the pump mode dependency for core pumped operation and help to increase the number of pump modes that can support a DMG below 1 dB. For the more practical case of cladding-pumped operation, where the pump mode dependency is almost removed, a DMG of 0.25 dB and a small signal gain of >20 dB can be achieved for the 12 OAM modes across the full Cband.

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