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Optimization of a DWDM Network

for Nonlinear impairments SPMand XPM

Javed Ali P2008EE1067Abhijeet Singh P2008EE1051Parteek Munjal P2008EE1076

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OB JECTIVE

TO D EVELO P A SOF TWARE TOO L TO CO MPUTENO N LINEAR IMPAIRMENTS IN DWD MNETWO RKS AND CO ME UP WITH ANO PTIMIZED SO LUTIO N.

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CO NTENTS

DWD M- INTROD UCTIO NIMPAIRMENTS

SPMXPMWO RKDO NE

FUTURE PLANS

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D WD M- INTROD UCTIO N

D ense Wavelength D ivision Multiplexing

(DWD M) is a fiber-optic transmissiontechnique. It involves the process of multiplexing many different wavelengthsignals onto a single fiber.

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IMPAIRMENTS

LINEAR- D ISPERSIO N ATTENUATIO N

NO N LINEAR SPM- SELF PHASE MOD ULATIO N XPM- CRO SS PHASE MOD ULATIO N FWM- FO UR WAVE MIXING

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SPM

nonlinear phase modulation of a beam, causedby its own intensity via the Kerr effect.

If an optical pulse is transmitted through amedium, the Kerr effect causes a time-dependentphase shift according to the time-dependentpulse intensity. In this way, an initial unchirpedoptical pulse acquires a so-called chirp, i.e., atemporally varying instantaneous frequency.

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XPM

Cross-phase modulation is the change in theoptical phase of a light beam caused by theinteraction with another beam in a nonlinearmedium.

Compared with the corresponding equationfor self-phase modulation, there is anadditional factor of 2.

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WO RKDO NE TILL NO W

Basic theory of optical communication.Modal analysisLearnt working on visual studio with visual C++ and C#.

Coding of Propagation Characteristics of Graded IndexFibers(parabolic index).Worked on the empirical formula for step index fibersto plot graph for derivative of bV and double derivative

of bV with respect to changing V.Computation of SPM and XPM power penalty.Pulse broadening in case of SPM.

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Empirical formula for step index fibers

To plot graph for derivative of bV and doublederivative of bV with respect to changing V

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InputsRefractive index of core= 1.46Wavelength of light used: 800 nmD elta: 0.01Radius of the core: 25 mX coordinate: 8 mY coordinate: 8 mMode of the field: TEM11

O utput:Field at the given location is: 3.14696 e-007 V/m

Propagation Characteristics of Graded IndexFibers(parabolic index)

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SPM Computation

Computation formula for PS D

- non linear parameter

P j, Pk - channel power- GVD- channel spacing

- attenuation coefficientL- length of fiber

S- PSD of power penalty

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Flowchart

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Temporal variation of power in SPM

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XPM ComputationComputation formula

Wc no. of channels- non linear parameter

P j0, Pk - channel power

D c- chromatic dispersion- channel spacing

- attenuation coefficientL- length of fiber

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Another form of implementation

- non linear parameterP j, Pk - channel power

- dispersion parameter- channel spacingd jk- relative walk off

- attenuation coefficientL- length of fiber - modulation frequency

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Flowchart

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Variation of XPM with input power

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XPM power penalty in various fibers

-NZD SF* -SMF

-D CF

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Future work

Further study of SPM and XPM.

Getting acclimated to O ptisystem and other

network designing tools.O ptimization of network having non linearimpairments.

O ptimization of codes for SPM and XPM.

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