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Ehrhardt A.,Deutsche Telekom AG | Paul M.,Deutsche Telekom AG | Schurer L.,Deutsche Telekom AG | Gerlach C.,Deutsche Telekom AG | And 7 more authors.
Journal of Networks | Year: 2010

The accumulated PMD along several fibers in an optical network was measured in order to identify those short fiber portions exhibiting high PMD. By replacing high-PMD-portion(s) in each fiber, the overall-PMD could be reduced significantly. Additionally the PMDaccumulation of different fibers in the same buried cable was investigated and compared to each other. © 2010 ACADEMY PUBLISHER.


Ehrhardt A.,Deutsche Telekom AG | Fritzsche D.,Enterprise Systems | Paul M.,Deutsche Telekom AG | Schuerer L.,Deutsche Telekom AG | And 6 more authors.
Journal of Networks | Year: 2010

Fibre links in optical networks generally comprise several relatively short fibre segments which have been spliced together in cables. These fibre segments or "sections" are assembled with optical connectors and have a typical length of some tens of km. The important characteristic parameters of the fibre sections are attenuation, chromatic dispersion (CD) and polarization mode dispersion (PMD). However, the PMD of the optical fibres can hamper the upgrade of optical backbone networks towards higher data rates of 40 Gbit/s and beyond. The PMD distribution along a buried fibre link is not constant and can also significantly vary between the concatenated fibres of the same optical cable. In the absence of such spatial information, the whole cable with higher PMD-values may have to be replaced in order to transmit 40 Gbit/s transparently over long distances. But investigations have shown that frequently localized pieces within a section are the major contributors to the overall high PMD value of the whole fibre, rendering the link unsuitable for higher data rates. A new random-scrambling polarization optical time domain reflectometry (POTDR) measurement technique is used to investigate the spatial distribution of the cumulative PMD in deployed fibres. Results help to identify high-PMD fibre pieces or sections which need to be replaced to enable 40 Gbit/s transmission and beyond, rather than substitution of a whole fibre link. Techno-economical investigations show the high economic potential of this method leading to significant reduction of expenses for infrastructure improvements. These improvements will enable network operators to transmit high data rates without limitation given by PMD. © 2010 Academy Publisher.


Wellbrock G.,Verizon | Xia T.J.,Verizon | Peterson D.,Verizon | Lee W.,Verizon | And 6 more authors.
2010 Conference on Optical Fiber Communication, Collocated National Fiber Optic Engineers Conference, OFC/NFOEC 2010 | Year: 2010

A tunable modulated broadband source and narrow-bandwidth filter are used to measure chromatic dispersion, group-delay ripple, and pass-band shape of DWDM-network light paths. This new method is simple and suitable for in-service measurements. ©2010 IEEE.


Gariepy D.,EXFO Electro Optical Engineering Inc. | He G.,EXFO Electro Optical Engineering Inc. | Breton Y.,EXFO Electro Optical Engineering Inc. | Dery B.,EXFO Electro Optical Engineering Inc. | Schinn G.W.,EXFO Electro Optical Engineering Inc.
2010 Conference on Optical Fiber Communication, Collocated National Fiber Optic Engineers Conference, OFC/NFOEC 2010 | Year: 2010

A new approach for in-band OSNR measurements in narrow DWDM channels is described, which is robust to PMD and enables rapid measurement of accurate OSNR values of >20 dB without need for polarization extinction. © 2010 IEEE.


Wellbrock G.,Verizon | Xia T.J.,Verizon | Peterson D.,Verizon | Lee W.,Verizon | And 6 more authors.
Optics InfoBase Conference Papers | Year: 2010

A tunable modulated broadband source and narrow-bandwidth filter are used to measure chromatic dispersion, group-delay ripple, and pass-band shape of DWDM-network light paths. This new method is simple and suitable for in-service measurements. © OSA/OFC/NFOEC 2010.


Gariepy D.,EXFO Electro Optical Engineering Inc | He G.,EXFO Electro Optical Engineering Inc | Breton Y.,EXFO Electro Optical Engineering Inc | Dery B.,EXFO Electro Optical Engineering Inc | Schinn G.W.,EXFO Electro Optical Engineering Inc
Optics InfoBase Conference Papers | Year: 2010

A new approach for in-band OSNR measurements in narrow DWDM channels is described, which is robust to PMD and enables rapid measurement of accurate OSNR values of >20 dB without need for polarization extinction. © 2010 OSA.

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