LambdaXtreme® transport system: R&amp;D of a high capacity system for low cost, ultra long haul DWDM transport

Fishman, D.A.; Thompson, W. A.; Vallone, Lee

doi:10.1002/bltj.20160

Cited by 44 publications

(23 citation statements)

References 38 publications

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“…The technology base used in the LambdaXtreme Transport System [1] enables network operators to build large transparent high-capacity networks. To Several key fiber characteristics influence transmission performance.…”

Section: Preparing and Characterizing The Outside Fiber Plantmentioning

confidence: 99%

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The rollout of optical networking: LambdaXtreme® national network deployment

Fishman

Correa

Goode³

et al. 2006

Bell Labs Tech. J.

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Section: Preparing and Characterizing The Outside Fiber Plantmentioning

confidence: 99%

“…In a companion paper, we discussed in detail the R&D, architecture, and operation of the LambdaXtreme ® Transport System [1]. In this paper, we discuss how Verizon, Lucent Worldwide Services (LWS), and Bell Laboratories worked together to build the first and largest transparent optical network in the U. S. [3,4].…”

Section: Introductionmentioning

confidence: 99%

The rollout of optical networking: LambdaXtreme® national network deployment

Fishman

Correa

Goode³

et al. 2006

Bell Labs Tech. J.

Self Cite

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“…1(a) shows examples of the accumulated dispersion at the span launch point for a typical singly periodic map using pre-compensation of -500 ps/nm and an RDPS of 40 ps/nm. Such dispersion maps have been shown to be highly effective at managing the growth of non-linear transmission impairments over long distances [1,2]. Without error, the accumulated dispersion will grow linearly with distance (circles).…”

Section: Mesh Network Dispersion Map Walk-offmentioning

confidence: 99%

“…In general, this requires thorough testing and validation for a specific system design [2]. Extensive simulation studies have been used to account for mesh transmission variations [2][3][4]. Circulating loop experiments, which are commonly used for long haul transmission, traditionally have not had the flexibility to examine a wide range of transmission characteristics [1].…”

Section: Introductionmentioning

confidence: 99%

“…Understanding how the transmission varies as the route characteristics deviate from the design targets is important for accurately predicting performance and thereby reducing regeneration. In general, this requires thorough testing and validation for a specific system design [2]. Extensive simulation studies have been used to account for mesh transmission variations [2-4].…”

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confidence: 99%

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Dynamic circulating-loop methods for transmission experiments in optically transparent networks

Kilper¹,

Chandrasekhar²,

Smyth

et al. 2008

2008 10th Anniversary International Conference on Transparent Optical Networks

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Recent experiments incorporating multiple fast switching elements and automated system configuration in a circulating loop apparatus have enabled the study of aspects of long-haul WDM transmission unique to optically transparent networks. Techniques include per-span switching to measure the performance limits due to dispersion compensation granularity and mesh network walk-off, and applied constant-gain amplification to evaluate wavelength reconfiguration penalties. Keywords: transparent networks, circulating loop experiments, dispersion compensation granularity, wavelength reconfiguration. INTRODUCTIONOptically transparent mesh networks take advantage of photonic cross-connects and reconfigurable optical adddrop multiplexers (ROADMs) to enable flexible wavelength routing in the physical layer. Neighbouring channels in the optical spectrum can traverse diverse routes through the network. The transmission performance of these channels will depend on the route physical parameters and on the different channel configurations encountered along the route. Physical parameters that influence transmission include factors such as the fiber span length, fiber type, and the dispersion management characteristics. Much is known about the propagation of signals over regular spans of similar types and lengths with well controlled dispersion maps [1]. In transparent networks, the number of different combinations of route parameters can quickly become too large to address explicitly in the system design. Understanding how the transmission varies as the route characteristics deviate from the design targets is important for accurately predicting performance and thereby reducing regeneration. In general, this requires thorough testing and validation for a specific system design [2]. Extensive simulation studies have been used to account for mesh transmission variations [2-4]. Circulating loop experiments, which are commonly used for long haul transmission, traditionally have not had the flexibility to examine a wide range of transmission characteristics [1]. Multi-loop experiments have been used to vary the fiber type over different transmission segments [5]. We introduced a dynamically reconfigurable circulating loop that enables long haul transmission experiments that examine the impact of dispersion map variations [6]. This new apparatus uses fast switches synchronized with the loop circulation in order to vary the length of fiber in each span. Further accounting for variations in the channel loading is complicated due to the strong dependence of the channel power on the amplifier dynamics and control. Typically channel reconfiguration is enabled in transparent networks by using optical amplifiers that are controlled to maintain a constant gain condition as the channel configuration is varied. Due to gain ripple and tilt, complex power dynamics can arise even for well controlled amplifiers [7]. In circulating loop experiments constant gain amplifier control is not desirable because the amplifiers are connected in a ring a...

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40 Gb/s DBPSK and DQPSK formats for transparent 50 GHz DWDM transmission

Chandrasekhar¹,

Liu²

2010

Bell Labs Tech. J.

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Today's dense wavelength division multiplexed (DWDM) (ILs), and arrayed waveguide grating (AWG) multiplexers and demultiplexers, support channel routing in several different directions, yielding so-called multidegree mesh ROADM. Transparently transporting high capacity DWDM channels through such an optical network is a challenge due to several physical impairments that are associated with the approach, and investigations are being continuously pursued to enhance the overall system performance.In this paper, we address the challenges in supporting 40 Gb/s at high SE by examining two promising modulation formats, namely, differential binary and quadrature phase shift keying (DBPSK and DQPSK). We examine the performance of the format under three typical physical impairments that are commonly encountered in transparent optical networks, namely, successive optical filtering at ROADM sites, coherent crosstalk originating at ROADMs, and polarization mode dispersion (PMD). We cover two types of ROADM architectures that are currently deployed, namely, a symmetric bandwidth allocated 50 GHz

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LambdaXtreme® transport system: R&D of a high capacity system for low cost, ultra long haul DWDM transport

Cited by 44 publications

References 38 publications

The rollout of optical networking: LambdaXtreme® national network deployment

The rollout of optical networking: LambdaXtreme® national network deployment

Dynamic circulating-loop methods for transmission experiments in optically transparent networks

40 Gb/s DBPSK and DQPSK formats for transparent 50 GHz DWDM transmission

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