Optical technologies and techniques for high bit rate fiber transmission

Liu, Xiang; Gill, Douglas M.; Chandrasekhar, S.

doi:10.1002/bltj.20163

Cited by 9 publications

(2 citation statements)

References 82 publications

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“…As described in [19], there are several modulation formats from which to choose in order to match system specific requirements. But the most recent advances in coherent detection associated to digital signal processing make it convenient to adopt polarization division multiplexing [7,9,12,18,20].…”

Section: Advanced Modulation Formatmentioning

confidence: 99%

Recent advances in submarine optical communication systems

Salsi¹,

Charlet²,

Renaudier³

et al. 2010

Bell Labs Tech. J.

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Later, a new technology was responsible for another major evolution of optical systems: wavelength division multiplexing (WDM). In WDM transmission, several channels are encoded on different wavelengths. They are then combined through a multiplexer within a single optical fiber. At the end of the transmission, an optical demultiplexer separates the different wavelengths and sends each to its respective optical receiver. In order to transmit more information on the fiber, and thus increase the capacity (a product of the channel number and the channel bit rate), the number of channels, the channel bit rate, or both can be increased.The first generation of WDM systems used a channel bit rate of 2.5 Gb/s (instead of 5 Gb/s for the first optically amplified single channel systems), and the number of channels grew from four to eight and, later, to 16.

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Section: Advanced Modulation Formatmentioning

confidence: 99%

Recent advances in submarine optical communication systems

Salsi¹,

Charlet²,

Renaudier³

et al. 2010

Bell Labs Tech. J.

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“…The data transmission rates are now moving from 10 Gb/s to 40 Gb/s on a wavelength and wavelengths are more densely spaced, typically at 50 GHz, yielding high spectral efficiency (SE). This dense wavelength division multiplexed (DWDM) transport system at the higher channel rates allowed for the investigation and studies of several optical technologies and techniques for generating different modulation formats [12,16]. In addition to carrying higher data rates on a wavelength, today's networks are evolving from simple point-to-point and ring networks to highly interconnected mesh networks, where reconfigurable optical add/drop multiplexers (ROADMs) have become key enablers for transparent optical networking [2,6,14].…”

Section: Introductionmentioning

confidence: 99%

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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