Wavelength Assignment for Physical-Layer-Impaired Optical Networks Using Evolutionary Computation

Carmelo J. A. Bastos-Filho; Daniel A. R. Chaves; Felipe S. F. e Silva; Helder A. Pereira; Joaquim F. Martins-Filho

doi:10.1364/JOCN.3.000178

Journal of Optical Communications and Networking
Vol. 3,
Issue 3,
pp. 178-188
(2011)
•https://doi.org/10.1364/JOCN.3.000178

Wavelength Assignment for Physical-Layer-Impaired Optical Networks Using Evolutionary Computation

Carmelo J. A. Bastos-Filho, Daniel A. R. Chaves, Felipe S. F. e Silva, Helder A. Pereira, and Joaquim F. Martins-Filho

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Carmelo J. A. Bastos-Filho, Daniel A. R. Chaves, Felipe S. F. e Silva, Helder A. Pereira, and Joaquim F. Martins-Filho, "Wavelength Assignment for Physical-Layer-Impaired Optical Networks Using Evolutionary Computation," J. Opt. Commun. Netw. 3, 178-188 (2011)

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Abstract

This paper presents a wavelength assignment algorithm suitable for optical networks mainly impaired by physical layer effects, named the Intelligent Wavelength Assignment algorithm (iWA). The main idea is to determine the wavelength activation order for a first-fit algorithm that balances the impact of the physical layer effects by using a training algorithm inspired by evolutionary concepts. The iWA presents some recently proposed concepts in intelligent optimization algorithms, such as an external archive to store the best solutions. Some different physical layer effects, such as four-wave mixing and residual dispersion, were considered in the tests of our proposal. We tested our proposal for transparent optical networks. However, we believe iWA can be used in other types of network, such as opaque networks and translucent networks. The proposed wavelength assignment algorithm was compared with five other wavelength assignment algorithms for two network topologies in three different scenarios. The iWA algorithm outperformed the other WA algorithms in most cases. The robustness of our proposed algorithm to the load distribution changes was also analyzed.

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Parameter	NSFNET	Pacific Bell	Definition
$P_{Laser}$	2 dBm	3 dBm	Output transmission power per channel
$P_{sat}$	25 dBm	25 dBm	Amplifier output saturation power
${OSNR}_{in}$	40 dB	40 dB	Input optical signal-to-noise ratio
${OSNR}_{QoT}$	23 dB	23 dB	Optical signal-to-noise ratio for QoT criterion (no FEC considered)
B	40 Gbps	40 Gbps	Transmission bit rate
$B_{0}$	100 GHz	100 GHz	Optical filter bandwidth
W	32	32	Number of wavelengths in an optical link
$Δ f$	100 GHz	100 GHz	Channel spacing
$λ_{i}$	1528.77 nm	1528.77 nm	The lower wavelength of the grid
$λ_{0}$	1534.25 nm	1510 nm	Zero dispersion wavelength for transmission fiber (DSF)
$λ_{0 R D}$	1541.35 nm	1541.35 nm	Zero dispersion wavelength for compensation fiber
α	0.2 dB/km	0.2 dB/km	Fiber loss coefficient
$L_{Mx}$	3 dB	3 dB	Multiplexer loss
$L_{Dx}$	3 dB	3 dB	Demultiplexer loss
$L_{Sw}$	3 dB	3 dB	Optical switch loss
$F_{0}$ (NF)	3.162 (5 dB)	3.162 (5 dB)	Amplifier noise factor (noise figure)
$D_{TF}$ (@1550 nm)	0 ps/km.nm	0 ps/km.nm	Dispersion coefficient of the transmission fiber
$S_{TF}$ (@1550 nm)	0.06 ps/km.nm²	0.095 ps/km.nm²	Dispersion slope of the transmission fiber
$D_{DCF}$ (@1550 nm)	−170 ps/km.nm	−170 ps/km.nm	Dispersion coefficient of the compensation fiber
$S_{DCF}$ (@1550 nm)	−0.612 ps/km.nm²	−0.612 ps/km.nm²	Dispersion slope of the compensation fiber
$Δ t_{Q o T}$	10%	10%	Maximum percentage of pulse broadening

Scenario	Optimized list (iWA)
$S_{1}$ -60 Erlangs	21	22	12	20	16	14	11	19	10	13	17	9	18	15	23	7	24	8	25	6	26	27	0	28	1	2	31	5	30	3	4	29
$S_{2}$ -60 Erlangs	10	13	22	19	20	21	17	12	14	18	16	15	23	11	8	24	9	25	26	5	6	28	30	7	31	2	3	4	29	1	27	0
$S_{3}$ -60 Erlangs	24	18	28	27	30	26	13	17	31	21	15	23	25	11	20	16	8	29	3	19	22	10	14	0	5	1	12	7	9	4	6	2

Scenario	Optimized list (iWA)
$S_{1}$ -60 Erlangs	8	9	22	23	10	15	18	12	19	16	20	21	11	14	17	13	24	7	26	25	6	5	0	2	3	28	27	29	4	31	1	30
$S_{1}$ -30 Erlangs	10	17	14	13	19	12	18	11	20	21	16	15	22	23	9	24	26	0	4	6	5	31	8	28	2	3	27	1	29	7	30	25
$S_{2}$ -60 Erlangs	24	23	16	9	14	21	18	20	12	11	19	22	13	10	17	15	8	25	6	26	7	2	3	5	0	29	1	30	28	27	31	4
$S_{2}$ -30 Erlangs	9	19	22	21	11	14	17	12	18	16	15	20	10	13	24	23	8	31	4	26	29	25	7	30	5	3	1	27	0	6	2	28
$S_{3}$ -60 Erlangs	26	18	4	28	9	30	14	16	11	13	22	21	5	1	29	0	19	25	7	24	31	20	8	2	10	3	6	15	12	23	27	17

Parameter	NSFNET	Pacific Bell	Definition
$P_{Laser}$	2 dBm	3 dBm	Output transmission power per channel
$P_{sat}$	25 dBm	25 dBm	Amplifier output saturation power
${OSNR}_{in}$	40 dB	40 dB	Input optical signal-to-noise ratio
${OSNR}_{QoT}$	23 dB	23 dB	Optical signal-to-noise ratio for QoT criterion (no FEC considered)
B	40 Gbps	40 Gbps	Transmission bit rate
$B_{0}$	100 GHz	100 GHz	Optical filter bandwidth
W	32	32	Number of wavelengths in an optical link
$Δ f$	100 GHz	100 GHz	Channel spacing
$λ_{i}$	1528.77 nm	1528.77 nm	The lower wavelength of the grid
$λ_{0}$	1534.25 nm	1510 nm	Zero dispersion wavelength for transmission fiber (DSF)
$λ_{0 R D}$	1541.35 nm	1541.35 nm	Zero dispersion wavelength for compensation fiber
α	0.2 dB/km	0.2 dB/km	Fiber loss coefficient
$L_{Mx}$	3 dB	3 dB	Multiplexer loss
$L_{Dx}$	3 dB	3 dB	Demultiplexer loss
$L_{Sw}$	3 dB	3 dB	Optical switch loss
$F_{0}$ (NF)	3.162 (5 dB)	3.162 (5 dB)	Amplifier noise factor (noise figure)
$D_{TF}$ (@1550 nm)	0 ps/km.nm	0 ps/km.nm	Dispersion coefficient of the transmission fiber
$S_{TF}$ (@1550 nm)	0.06 ps/km.nm²	0.095 ps/km.nm²	Dispersion slope of the transmission fiber
$D_{DCF}$ (@1550 nm)	−170 ps/km.nm	−170 ps/km.nm	Dispersion coefficient of the compensation fiber
$S_{DCF}$ (@1550 nm)	−0.612 ps/km.nm²	−0.612 ps/km.nm²	Dispersion slope of the compensation fiber
$Δ t_{Q o T}$	10%	10%	Maximum percentage of pulse broadening

Scenario	Optimized list (iWA)
$S_{1}$ -60 Erlangs	21	22	12	20	16	14	11	19	10	13	17	9	18	15	23	7	24	8	25	6	26	27	0	28	1	2	31	5	30	3	4	29
$S_{2}$ -60 Erlangs	10	13	22	19	20	21	17	12	14	18	16	15	23	11	8	24	9	25	26	5	6	28	30	7	31	2	3	4	29	1	27	0
$S_{3}$ -60 Erlangs	24	18	28	27	30	26	13	17	31	21	15	23	25	11	20	16	8	29	3	19	22	10	14	0	5	1	12	7	9	4	6	2

Abstract

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Tables (3)

Journal of Optical Communications and Networking