CONTROL OF CHANNEL POWER INSTABILITIES IN CONSTANT-GAIN AMPLIFIED TRANSPARENT NETWORKS USING SCALABLE MESH SCHEDULING

  • Chandrasekhar P
  • Kilper D.
  • White C.

Experiments on a transparent, constant-gain-controlled amplifier ring network show that channel-power coupling can lead to instability in channel power control at add drop nodes. This instability can cause power oscillations due to competing adjustments on multiple nodes. Sequencing channel power tuning on each node is shown to result in stable ...

25.6-TB/S WDM TRANSMISSION OF POLARIZATION-MULTIPLEXED RZ-DQPSK SIGNALS

  • Burrows E.
  • Charlet G.
  • Doerr C.
  • Gnauck A.
  • Kawanishi T.
  • Tran P.
  • Winzer P.

We demonstrate record 25.6-Tb/s transmission over 240 km using 160 WDM channels on a 50-GHz grid in the C+L bands. Each channel contains two polarization-multiplexed 85.4-Gb/s RZ-DQPSK signals, yielding a spectral efficiency of 3.2b/s/Hz in each band.

TERABIT TRANSMISSION AT 42.7-GB/S ON 50-GHZ GRID USING HYBRID RZ-DQPSK AND NRZ-DBPSK FORMATS OVER 16TIMES80 KM SSMF SPANS AND 4 BANDWIDTH-MANAGED ROADMS

  • Buhl L.
  • Burrows E.
  • Chandrasekhar P
  • Doerr C.
  • Gnauck A.
  • Kilper D.

We demonstrate for the first time the use of asymmetric-bandwidth interleaver-based reconfigurable optical add-drop multiplexer (ROADM) to transmit 42.7-Gb/s channels on a 50-GHz grid. Differential binary phase shift keyed (DBPSK) format was used on the wide passband side and differential quadrature phase shift keyed (DQPSK) format was used on the ...

ELECTRONIC DISPERSION COMPENSATION

  • Buchali F.
  • Klekamp A.

The performance of different electronic equalization and processing schemes for 40- and 10-Gb/s optical transmission over single-mode fiber (SMF) are discussed, from the point of their ability to compensate chromatic dispersion (CD) and polarization mode dispersion (PMD). In addition, the impact of fiber nonlinearity and modulation format on equalization is ...

HIGH GAIN BANDWIDTH PRODUCT OVER 140-GHZ PLANAR JUNCTION ALINAS AVALANCHE PHOTODIODES

  • Achouche M.
  • Carpentier D.
  • Decobert J.
  • Lagay N.
  • Pommereau F.
  • Rouvie A.

This letter demonstrates a planar junction GalnAs-AlInAs avalanche photodiode using back-side illumination through thinned InP substrate covered with chemical vapor deposition SiNx antireflection coating. The combined properties of very low dark current (Idark(M = 0) = 17 nA), low excess noise factor (f(M = 10) = 3.5), and high gain ...

CORRELATED FEC SCHEME FOR TRANSMISSION RELIABILITY OBER BURST ERROR WIRELESS CHANNELS

  • Liu E.
  • Shen G.

This paper presents a novel and efficient error correction scheme with high recovery capability, especially for burst error wireless channels. The proposed scheme introduces a correlated FEC approach that not only increases the FEC recovery capability within its own block, but also in preceding block(s). It uses special algorithm that ...

TEST OPTIMIZATION USING SOFTWARE VIRTUALIZATION

  • Krishnamurthy B.
  • Swaminathan S

The availability of testing infrastructure is a major factor in product development project costs. Software virtualization is a powerful mechanism for simulating a test setup on a few desktops that would otherwise require "real" equipment. It has shown a savings of about 30 percent of overall product development costs by ...

A NOVEL TIMING SYNCHRONIZATION METHOD FOR DISTRIBUTED MIMO-OFDM SYSTEM

  • Cai L
  • Guo F
  • Li D.
  • Yang H.

Orthogonal frequency division multiplexing (OFDM) is a popular method for high data rate wireless transmission. Its capability of turning a frequency-selective channel into a parallel collection of frequency flat subchannels has attracted huge interest from the research community as well as the industry. Multiple Input and Multiple Output (MIMO) configuration ...

ENHANCED PHASE-SHIFTED PILOTS BASED CHANNEL ESTIMATION FOR MIMO-OFDM SYSTEMS WITH VIRTUAL SUBCARRIERS

  • Cai L
  • Li D.
  • Yang H.
  • Zhu X.

Generalizing a conventional phase-shifted pilot (PSP) sequences and discrete Fourier Transform (DFT) based channel estimator to MIMO-OFDM systems with virtual subcarriers, this paper presents two enhanced channel estimators applying Wiener interpolation and smoothing. Simulation results show that the proposed schemes can almost eliminate the mean square error floor of the ...

ON THE CORRELATION OF SUBCARRIERS IN GROUPED LINEAR CONSTELLATION PRECODING OFDM SYSTEMS OVER FREQUENCY SELECTIVE FADING

  • Zhu X.

This paper addresses the correlation of subcarriers in orthogonal frequency division multiplexing (OFDM) systems over frequency selective fading, and derives the optimum grouping scheme for grouped linear constellation precoding (GLCP-) OFDM systems. Since the subcarriers are generally correlated over practical propagation channel, a larger group size in GLCP-OFDM using the ...

ENHANCED DFT INTERPOLATION-BASED CHANNEL ESTIMATION FOR OFDM SYSTEMS WITH VIRTUAL SUBCARRIERS

  • Cai L
  • Guo F
  • Li D.
  • Li G.

In practical OFDM systems, some virtual subcarriers are reserved for easing the requirements on the filter. In this case, the channel impulse response (CIR) estimated by DFT approaches appears a spectral leakage, which results in an error floor for the MSE performance. This paper proposes two enhanced DFT interpolation-based channel ...

PLASMA ESD QUALIFICATION TEST PROCEDURE OF ALCATEL ALENIA SPACE SOLAR ARRAY

  • Berthou C
  • Boulanger B

The detrimental effects of spacecraft charging are well known, particularly when the charging leads to arcing on solar array and, consequently, to permanent power loss. Motivated by these concerns, Alcatel Alenia Space has undertaken several test campaigns to qualify solar array design and to investigate margins. This paper describes the ...

TRAFFIC ENGINEERING ELEMENT FOR GMPLS NETWORKS

  • Berde B.
  • Papadimitriou D.

In future multilayer packet circuit networks, the Traffic Engineering (TE) apparatus is foreseen as a fundamental (logically independent) toolset, which carries out TE tasks, taking into account the operators operational considerations and fulfilling their TE constraints. The TE toolset relies on the Generalized Multi-Protocol Label Switching (GMPLS) suite of protocols; ...

RUSSIAN CONSUMERS LEAPFROG TO IP TV

  • Bronner D
  • Tatarchenko S

Introducing IP TV, a state-of-the art technology, in a high-growth economy like Russia requires special solutions and skills.

NORTH CHINA PROVINCE ENJOYS NEW NGN-BASED MULTIMEDIA SERVICES FROM CNC

  • Razaque A
  • Wang Z.

Consumers in North China Province to benefit from next-generation services

GLOBACOM : AIMING TO BE THE #1 AFRICAN OPERATOR

  • Dognon T
  • Hebot F

How a Nigerian company with no telecommunications background has become, in three years, a leading operator in Africa, thanks to its ambitious strategy and Alcatel's full-time support

ORASCOM TELECOM AND ALCATEL, PARTNERS FOR GROWTH : A SUCCESS STORY IN THE MIDDLE EAST

  • Hovsepian I
  • Rizkalla S
  • Sallet F

Successfully meeting the challenge of high-growth economies

UNIVERSAL BROADBAND ACCESS IN EMERGING ECONOMIES : A KEY FACTOR TO BRIDGE THE DIGITAL DIVIDE

  • Albrand T
  • Marine S

Universal broadband access can be achieved by leveraging new technologies, innovative applications and services, and international cooperation for traffic backhauling

ACHIEVING EFFICIENT OPERATIONAL TRANSFORMATION

  • Mayer J.
  • Morvan G

Achieving efficient operational transformation implies for service providers a combination of advanced process automation, business flexibility, high-standard customer service and self-care, and ultra-low operating costs; Alcatel has developed a global, packaged approach to address these challenges.

MICROWAVE TAKES A LEAP INTO A NEW DIMENSION : PACKET RADIO

  • Giavoli F
  • Mirelli G.

Alcatel's microwave solution is evolving into a new dimension enabling the delivery of Broadband for All. Packet Radio is the new concept that will change the microwave market for the better.