Increasing the bandwidth-distance product of multimode fibre using offset launch

Raddatz, L.; White, IH; Cunningham, D.G.; Nowell, M.C.

doi:10.1049/el:19970160

Cited by 36 publications

(11 citation statements)

References 1 publication

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“…5 it is therfore necessary to keep the lasers linewidth at a minimum, in order to maximize the received power of the mm-wave signal. As discussed earlier, the effect of various offset launch (OL) conditions has proven to increase the bandwidth of the modulated signal at photodetection, Fig 6. The observed result is simlar to previous published work [6].…”

Section: δA = Exp(-2πdzcd(f Sweep /(F L1 ) 2 ));supporting

confidence: 92%

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60GHz delivery over SMF and MMF for in-door applications

Igweani

Al-Raweshidy

2013

2013 Africon

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This paper investigates the design of a low power consumption mm-wave radio-over-fiber transmission over 25km SMF and 30m MMF for in-door applications using a dual drive Mach-Zehnder modulator (DD-MZM) and WDM multiplexers. This architecture includes the generation of both a 60GHz mmwave signal and a remote local oscillator (LO) for uplink transmission at the residential gateway by utilizing the coexistence of two lasers and a DD-MZM at the central office to create optical carrier suppression modulation. At the receiver gateway, Offset Launch conditions between the SMF and MMF-POF fiber optic cables is used to mitigate the impact of multimodal dispersion found in the multimode optical fiber.Keywords-plastic optical fiber, optical millimeter wave generation, radio-over-fiber.

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Section: δA = Exp(-2πdzcd(f Sweep /(F L1 ) 2 ));supporting

confidence: 92%

“…Regardless of the type of MMF fiber, their core diameters or core refractive index profiles, improved bandwidth capacity is achieved. This technique isn't susceptible to environmental conditions and can withstand bending of the MMF links at angles up to 6 o from an ordinary stationary position [6].…”

Section: Introductionmentioning

confidence: 99%

60GHz delivery over SMF and MMF for in-door applications

Igweani

Al-Raweshidy

2013

2013 Africon

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“…DGD is the relative difference in group-delays (GD), for portions of the signal travelling in different co-propagating modes of a fiber. This is an important consideration in multimode fiber links used for LANs and the Ethernet [40]. DGD can cause a well-defined input pulse to arrive as several temporally separated pulses at the output, because traversal times (GDs) for light in different modes may be distinct.…”

Section: Module Assembly and Combating Modal Interferencementioning

confidence: 99%

Static and tunable dispersion management with higher order mode fibers

Ramachandran¹,

Yan²

2006

J Optic Comm Rep

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Few mode fibers have recently attracted a lot of attention, because of the prospect of enhanced design flexibility, unique modal properties, and the existence of several simultaneous light-paths in them. After the pioneering experiments by Craig Poole from Bell Labs in 1993, an application that faded away but saw a re-emergence in 2000-2003 was higher order mode dispersion compensation. In this scheme, mode converters are used to selectively propagate the signal in a higher order mode of a few-mode fiber.Demonstrations over the last few years have shown that this novel technology can provide several benefits over the conventional dispersion compensating fiber, such as lower nonlinearity, higher dispersions, potentially lower loss, and most interestingly, a format to realize tunable dispersion compensation devices. It also has attendant tradeoffs arising from the need to manage modal interference, and a complex architecture that may make it more costly. This talk will review the physics and technology of the higher order mode dispersion compensator and discuss its future directions.

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“…Approaches to overcome this limitation have been investigated intensively in recent decades and have explored different launch schemes to achieve restricted mode excitation and hence allow increased link bandwidth 1,2 . In the 10 Gigabit Ethernet standard, for example, a dual launch scheme was adopted, this involving the use of either centre or offset launch depending which performed better with the given installed fibre.…”

Section: Introductionmentioning

confidence: 99%