1.3 μm bidirectional optical transmission over 31 km of installed single-mode fibre using optical couplers

McDonna, A.P.; McCartney, D.J.; Mortimore, D.B.

doi:10.1049/el:19840494

Cited by 17 publications

(7 citation statements)

References 1 publication

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“…Another interesting application is to provide duplex transmission [9] along a single fiber with a light source at only one end of the link. This idea is shown in Fig.…”

Section: Applicationsmentioning

confidence: 99%

Fiber loop reflectors

Mortimore

1988

J. Lightwave Technol.

Self Cite

418

164

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The theory and application of fiber loop reflectors, fabricated by forming a fiber loop between the output ports of a directional coupler, is described. The reflectivity of the loop is shown to depend upon the coupling characteristics of the coupler and on the degree of birefringence in the fiber loop. Measured loop. reflectivities, in terms of wavelength response, coupling ratio, and loop birefringence are shown to agree very well with theory. Two applications of the fiber reflector are briefly discussed; an all fiber laser and a duplex optical communications link using a single light source.

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“…Another interesting application is to provide duplex transmission [9] along a single fiber with a light source at only one end of the link. This idea is shown in Fig.…”

Section: Applicationsmentioning

confidence: 99%

Fiber loop reflectors

Mortimore

1988

J. Lightwave Technol.

Self Cite

418

164

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“…Recently bi-directional transmission over an individual single-mode fibre using lasers of similar wavelength has been reported [7,8]. Doubling the capacity of a single fibre using this optical technique has been made possible by the development and manufacture of cheap, stable, low-loss optical directional couplers [9,10,11].…”

Section: Duplex Use Of the Transmission Pathmentioning

confidence: 99%

The evolutionary potential of single-mode optical fibre systems

McDonna¹,

Mortimore²

2007

BT Technol J

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Single-mode optical fibre systems presently being installed in the BT network are primarily operating at 140 Mbit/s and 1.3 μm wavelength. There is scope for increasing the information capacity of these installed systems by both electrical and optical techniques. Three feasible upgrade options will be discussed and results of experiments performed at British Telecom Research Laboratories (BTRL) presented. 1.A diet rich in fibre

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“…The above condition can be expressed by -= mT, ν (2) where 1 is the link length, v is the group velocity of light in fiber, which is approximately 2 · 10 8 m/s, and m is an arbitrary integer. From (2) we obtain that the allowed frequencies are f = , m=l,2,3,...…”

Section: System Description and Theoretical Analysismentioning

confidence: 99%

“…In the case when the possible frequency deviation is not acceptable, and in a case of link with repeaters, we can trim the line length so to satisfy condition (2). This means that our fiber should exceed necessary line length for at most Δ1 which corresponds to the length that light passes through the fiber during the bit interval:…”

Section: System Description and Theoretical Analysismentioning

confidence: 99%

“…Bidirectional transmission is usually achieved by wavelength-division multiplexing (WDM). Some authors propose using the same wavelengths for each direction of transmission with separation of signals going to and from terminal by directional couplers [1][2][3]. Such devices are usually simpler than devices for wavelength separation (e. g. using interference filters [4]) and often introduce less attenuation.…”

Section: Introductionmentioning

confidence: 99%

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Bidirectional Digital Optical Fiber System with Transmitters Synchronized with Receivers

Petrovic

Cvijetic

1987

Journal of Optical Communications

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Bidirectional digital optical fiber system at the same wavelength over a single optical fiber, which provides that transmit pulses reflected back to receiver from adjacent directional coupler and/or connector fall between pulses from the far end, is theoretically considered and its feasibility is experimentaly confirmed. Such systems give better receiver sensitivity and require simpler couplers and connectors than similar systems whithout synchronisation. Necessary frequency and/or line length adjustments are investigated.

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1.3 μm bidirectional optical transmission over 31 km of installed single-mode fibre using optical couplers

Cited by 17 publications

References 1 publication

Fiber loop reflectors

Fiber loop reflectors

The evolutionary potential of single-mode optical fibre systems

Bidirectional Digital Optical Fiber System with Transmitters Synchronized with Receivers

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