Abstract

The flexibility and elasticity of the spectrum is an important topic today. As the capacity of deployed fiber-optic systems is becoming scarce, it is vital to shift towards solutions ensuring higher spectral efficiency. Working in this direction, we report an extensive experimental study on adaptive allocation of superchannels in spectrum-flexible heterogeneous optical network. In total, three superchannels were transmitted. Two 5-subcarrier 14-GHz-spaced, 14 Gbaud, polarization-division-multiplexed (PDM) quadrature-phase-shift-keyed (QPSK) superchannels were separated by a spectral gap, the band of interest (BOI). The bandwidth of the BOI was varied. The BOI was subsequently filled with another superchannel, constituted by a different number of either 14 Gbaud PDM-QPSK or PDM-16-ary quadrature amplitude modulation (16-QAM) subcarriers. The optical signal-to-noise ratio (OSNR) for transmission of the subcarriers inserted into the BOI, depending on the modulation format, subcarrier count and spacing to the neighboring superchannels, was extracted through experimental implementation of different scenarios. The obtained values were interpolated to yield the required OSNR necessary to maintain a 1×103 bit error rate of the central BOI subcarrier. The results provide a rule of thumb that can be exploited in resource allocation mechanisms of future spectrum-flexible optical networks.

© 2012 OSA

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  4. Y.-K. Huang, E. Ip, P. N. Ji, Y. Shao, T. Wang, Y. Aono, Y. Yano, and T. Tajima, “Terabit/s optical superchannel with flexible modulation format for dynamic distance/route transmission,” in Optical Fiber Communication Conf., 2012, OM3H.4.
  5. S. Chandrasekhar, X. Liu, B. Zhu, and D. W. Peckham, “Transmission of a 1.2-Tb/s 24-carrier no-guard-interval coherent OFDM superchannel over 7200-km of ultra-large-area fiber,” in 35th European Conf. on Optical Communication (ECOC), Sept.2009, vol. 2009-Supplement, pp. 1–2.
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    [CrossRef]
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2011 (3)

M. Jinno, T. Ohara, Y. Sone, A. Hirano, O. Ishida, and M. Tomizawa, “Elastic and adaptive optical networks: possible adoption scenarios and future standardization aspects,” IEEE Commun. Mag., vol. 49, no. 10, pp. 164–172, Oct.2011.
[CrossRef]

K. Christodoulopoulos, I. Tomkos, and E. Varvarigos, “Elastic bandwidth allocation in flexible OFDM-based optical networks,” J. Lightwave Technol., vol. 29, no. 9, pp. 1354–1366, May2011.
[CrossRef]

D. Zibar, R. Sambaraju, A. Caballero, J. Herrera, U. Westergren, A. Walber, J. Jensen, J. Marti, and I. Monroy, “High-capacity wireless signal generation and demodulation in 75- to 110-GHz band employing all-optical OFDM,” IEEE Photon. Technol. Lett., vol. 23, no. 12, pp. 810–812, June2011.
[CrossRef]

2010 (3)

2009 (2)

W. Qiu, S. Yu, J. Zhang, J. Shen, W. Li, H. Guo, and W. Gu, “The nonlinear impairments due to the data correlation among sub-carriers in coherent optical OFDM systems,” J. Lightwave Technol., vol. 27, no. 23, pp. 5321–5326, Dec.2009.
[CrossRef]

M. Jinno, H. Takara, B. Kozicki, Y. Tsukishima, Y. Sone, and S. Matsuoka, “Spectrum-efficient and scalable elastic optical path network: architecture, benefits, and enabling technologies,” IEEE Commun. Mag., vol. 47, no. 11, pp. 66–73, Nov.2009.
[CrossRef]

Angelou, M.

R. Borkowski, F. Karinou, M. Angelou, V. Arlunno, D. Zibar, D. Klonidis, N. G. Gonzalez, A. Caballero, I. Tomkos, and I. T. Monroy, “Experimental demonstration of mixed formats and bit rates signal allocation for spectrum-flexible optical networking,” in Optical Fiber Communication Conf., 2012, OW3A.7.

Aono, Y.

Y.-K. Huang, E. Ip, P. N. Ji, Y. Shao, T. Wang, Y. Aono, Y. Yano, and T. Tajima, “Terabit/s optical superchannel with flexible modulation format for dynamic distance/route transmission,” in Optical Fiber Communication Conf., 2012, OM3H.4.

T. Xia, G. Wellbrock, Y.-K. Huang, E. Ip, M.-F. Huang, Y. Shao, T. Wang, Y. Aono, T. Tajima, S. Murakami, and M. Cvijetic, “Field experiment with mixed line-rate transmission (112-Gb/s, 450-Gb/s, and 1.15-Tb/s) over 3560 km of installed fiber using filterless coherent receiver and EDFAs only,” in Optical Fiber Communication Conf., 2011, PDPA3.

Arlunno, V.

R. Borkowski, F. Karinou, M. Angelou, V. Arlunno, D. Zibar, D. Klonidis, N. G. Gonzalez, A. Caballero, I. Tomkos, and I. T. Monroy, “Experimental demonstration of mixed formats and bit rates signal allocation for spectrum-flexible optical networking,” in Optical Fiber Communication Conf., 2012, OW3A.7.

Borkowski, R.

R. Borkowski, F. Karinou, M. Angelou, V. Arlunno, D. Zibar, D. Klonidis, N. G. Gonzalez, A. Caballero, I. Tomkos, and I. T. Monroy, “Experimental demonstration of mixed formats and bit rates signal allocation for spectrum-flexible optical networking,” in Optical Fiber Communication Conf., 2012, OW3A.7.

I. Tafur Monroy, D. Zibar, N. Guerrero Gonzalez, and R. Borkowski, “Cognitive Heterogeneous Reconfigurable Optical Networks (CHRON): enabling technologies and techniques,” in 13th Int. Conf. on Transparent Optical Networks (ICTON), June 2011.

Buhl, L.

Caballero, A.

D. Zibar, R. Sambaraju, A. Caballero, J. Herrera, U. Westergren, A. Walber, J. Jensen, J. Marti, and I. Monroy, “High-capacity wireless signal generation and demodulation in 75- to 110-GHz band employing all-optical OFDM,” IEEE Photon. Technol. Lett., vol. 23, no. 12, pp. 810–812, June2011.
[CrossRef]

R. Borkowski, F. Karinou, M. Angelou, V. Arlunno, D. Zibar, D. Klonidis, N. G. Gonzalez, A. Caballero, I. Tomkos, and I. T. Monroy, “Experimental demonstration of mixed formats and bit rates signal allocation for spectrum-flexible optical networking,” in Optical Fiber Communication Conf., 2012, OW3A.7.

Chandrasekhar, S.

S. Chandrasekhar, X. Liu, B. Zhu, and D. W. Peckham, “Transmission of a 1.2-Tb/s 24-carrier no-guard-interval coherent OFDM superchannel over 7200-km of ultra-large-area fiber,” in 35th European Conf. on Optical Communication (ECOC), Sept.2009, vol. 2009-Supplement, pp. 1–2.

Christodoulopoulos, K.

K. Christodoulopoulos, I. Tomkos, and E. Varvarigos, “Elastic bandwidth allocation in flexible OFDM-based optical networks,” J. Lightwave Technol., vol. 29, no. 9, pp. 1354–1366, May2011.
[CrossRef]

K. Christodoulopoulos, I. Tomkos, and E. Varvarigos, “Dynamic bandwidth allocation in flexible OFDM-based networks,” in Optical Fiber Communication Conf., 2011, OTuI5.

Cvijetic, M.

T. Xia, G. Wellbrock, Y.-K. Huang, E. Ip, M.-F. Huang, Y. Shao, T. Wang, Y. Aono, T. Tajima, S. Murakami, and M. Cvijetic, “Field experiment with mixed line-rate transmission (112-Gb/s, 450-Gb/s, and 1.15-Tb/s) over 3560 km of installed fiber using filterless coherent receiver and EDFAs only,” in Optical Fiber Communication Conf., 2011, PDPA3.

Doerr, C.

Essiambre, R.-J.

Foschini, G.

Gnauck, A.

Goebel, B.

Gonzalez, N. G.

R. Borkowski, F. Karinou, M. Angelou, V. Arlunno, D. Zibar, D. Klonidis, N. G. Gonzalez, A. Caballero, I. Tomkos, and I. T. Monroy, “Experimental demonstration of mixed formats and bit rates signal allocation for spectrum-flexible optical networking,” in Optical Fiber Communication Conf., 2012, OW3A.7.

Gu, W.

Guerrero Gonzalez, N.

I. Tafur Monroy, D. Zibar, N. Guerrero Gonzalez, and R. Borkowski, “Cognitive Heterogeneous Reconfigurable Optical Networks (CHRON): enabling technologies and techniques,” in 13th Int. Conf. on Transparent Optical Networks (ICTON), June 2011.

Guo, H.

Herrera, J.

D. Zibar, R. Sambaraju, A. Caballero, J. Herrera, U. Westergren, A. Walber, J. Jensen, J. Marti, and I. Monroy, “High-capacity wireless signal generation and demodulation in 75- to 110-GHz band employing all-optical OFDM,” IEEE Photon. Technol. Lett., vol. 23, no. 12, pp. 810–812, June2011.
[CrossRef]

Hirano, A.

M. Jinno, T. Ohara, Y. Sone, A. Hirano, O. Ishida, and M. Tomizawa, “Elastic and adaptive optical networks: possible adoption scenarios and future standardization aspects,” IEEE Commun. Mag., vol. 49, no. 10, pp. 164–172, Oct.2011.
[CrossRef]

Huang, M.-F.

T. Xia, G. Wellbrock, Y.-K. Huang, E. Ip, M.-F. Huang, Y. Shao, T. Wang, Y. Aono, T. Tajima, S. Murakami, and M. Cvijetic, “Field experiment with mixed line-rate transmission (112-Gb/s, 450-Gb/s, and 1.15-Tb/s) over 3560 km of installed fiber using filterless coherent receiver and EDFAs only,” in Optical Fiber Communication Conf., 2011, PDPA3.

Huang, Y.-K.

T. Xia, G. Wellbrock, Y.-K. Huang, E. Ip, M.-F. Huang, Y. Shao, T. Wang, Y. Aono, T. Tajima, S. Murakami, and M. Cvijetic, “Field experiment with mixed line-rate transmission (112-Gb/s, 450-Gb/s, and 1.15-Tb/s) over 3560 km of installed fiber using filterless coherent receiver and EDFAs only,” in Optical Fiber Communication Conf., 2011, PDPA3.

Y.-K. Huang, E. Ip, P. N. Ji, Y. Shao, T. Wang, Y. Aono, Y. Yano, and T. Tajima, “Terabit/s optical superchannel with flexible modulation format for dynamic distance/route transmission,” in Optical Fiber Communication Conf., 2012, OM3H.4.

Ip, E.

Y.-K. Huang, E. Ip, P. N. Ji, Y. Shao, T. Wang, Y. Aono, Y. Yano, and T. Tajima, “Terabit/s optical superchannel with flexible modulation format for dynamic distance/route transmission,” in Optical Fiber Communication Conf., 2012, OM3H.4.

T. Xia, G. Wellbrock, Y.-K. Huang, E. Ip, M.-F. Huang, Y. Shao, T. Wang, Y. Aono, T. Tajima, S. Murakami, and M. Cvijetic, “Field experiment with mixed line-rate transmission (112-Gb/s, 450-Gb/s, and 1.15-Tb/s) over 3560 km of installed fiber using filterless coherent receiver and EDFAs only,” in Optical Fiber Communication Conf., 2011, PDPA3.

Ishida, O.

M. Jinno, T. Ohara, Y. Sone, A. Hirano, O. Ishida, and M. Tomizawa, “Elastic and adaptive optical networks: possible adoption scenarios and future standardization aspects,” IEEE Commun. Mag., vol. 49, no. 10, pp. 164–172, Oct.2011.
[CrossRef]

Jensen, J.

D. Zibar, R. Sambaraju, A. Caballero, J. Herrera, U. Westergren, A. Walber, J. Jensen, J. Marti, and I. Monroy, “High-capacity wireless signal generation and demodulation in 75- to 110-GHz band employing all-optical OFDM,” IEEE Photon. Technol. Lett., vol. 23, no. 12, pp. 810–812, June2011.
[CrossRef]

Ji, P. N.

Y.-K. Huang, E. Ip, P. N. Ji, Y. Shao, T. Wang, Y. Aono, Y. Yano, and T. Tajima, “Terabit/s optical superchannel with flexible modulation format for dynamic distance/route transmission,” in Optical Fiber Communication Conf., 2012, OM3H.4.

Jinno, M.

M. Jinno, T. Ohara, Y. Sone, A. Hirano, O. Ishida, and M. Tomizawa, “Elastic and adaptive optical networks: possible adoption scenarios and future standardization aspects,” IEEE Commun. Mag., vol. 49, no. 10, pp. 164–172, Oct.2011.
[CrossRef]

M. Jinno, H. Takara, B. Kozicki, Y. Tsukishima, Y. Sone, and S. Matsuoka, “Spectrum-efficient and scalable elastic optical path network: architecture, benefits, and enabling technologies,” IEEE Commun. Mag., vol. 47, no. 11, pp. 66–73, Nov.2009.
[CrossRef]

Junyent, G.

L. Velasco, M. Klinkowski, M. Ruiz, V. López, and G. Junyent, “Elastic spectrum allocation for variable traffic in flexible-grid optical networks,” in Nat. Fiber Optic Engineers Conf., 2012, JTh2A.39.

Karinou, F.

R. Borkowski, F. Karinou, M. Angelou, V. Arlunno, D. Zibar, D. Klonidis, N. G. Gonzalez, A. Caballero, I. Tomkos, and I. T. Monroy, “Experimental demonstration of mixed formats and bit rates signal allocation for spectrum-flexible optical networking,” in Optical Fiber Communication Conf., 2012, OW3A.7.

Kikuchi, K.

K. Kikuchi, “Polarization-demultiplexing algorithm in the digital coherent receiver,” in 2008 Digest of the IEEE/LEOS Summer Topical Meetings, July2008, pp. 101–102.

Klinkowski, M.

L. Velasco, M. Klinkowski, M. Ruiz, V. López, and G. Junyent, “Elastic spectrum allocation for variable traffic in flexible-grid optical networks,” in Nat. Fiber Optic Engineers Conf., 2012, JTh2A.39.

Klonidis, D.

R. Borkowski, F. Karinou, M. Angelou, V. Arlunno, D. Zibar, D. Klonidis, N. G. Gonzalez, A. Caballero, I. Tomkos, and I. T. Monroy, “Experimental demonstration of mixed formats and bit rates signal allocation for spectrum-flexible optical networking,” in Optical Fiber Communication Conf., 2012, OW3A.7.

Kozicki, B.

M. Jinno, H. Takara, B. Kozicki, Y. Tsukishima, Y. Sone, and S. Matsuoka, “Spectrum-efficient and scalable elastic optical path network: architecture, benefits, and enabling technologies,” IEEE Commun. Mag., vol. 47, no. 11, pp. 66–73, Nov.2009.
[CrossRef]

Kramer, G.

Li, W.

Liu, X.

S. Chandrasekhar, X. Liu, B. Zhu, and D. W. Peckham, “Transmission of a 1.2-Tb/s 24-carrier no-guard-interval coherent OFDM superchannel over 7200-km of ultra-large-area fiber,” in 35th European Conf. on Optical Communication (ECOC), Sept.2009, vol. 2009-Supplement, pp. 1–2.

López, V.

L. Velasco, M. Klinkowski, M. Ruiz, V. López, and G. Junyent, “Elastic spectrum allocation for variable traffic in flexible-grid optical networks,” in Nat. Fiber Optic Engineers Conf., 2012, JTh2A.39.

Magarini, M.

Marti, J.

D. Zibar, R. Sambaraju, A. Caballero, J. Herrera, U. Westergren, A. Walber, J. Jensen, J. Marti, and I. Monroy, “High-capacity wireless signal generation and demodulation in 75- to 110-GHz band employing all-optical OFDM,” IEEE Photon. Technol. Lett., vol. 23, no. 12, pp. 810–812, June2011.
[CrossRef]

Matsuoka, S.

M. Jinno, H. Takara, B. Kozicki, Y. Tsukishima, Y. Sone, and S. Matsuoka, “Spectrum-efficient and scalable elastic optical path network: architecture, benefits, and enabling technologies,” IEEE Commun. Mag., vol. 47, no. 11, pp. 66–73, Nov.2009.
[CrossRef]

Monroy, I. T.

R. Borkowski, F. Karinou, M. Angelou, V. Arlunno, D. Zibar, D. Klonidis, N. G. Gonzalez, A. Caballero, I. Tomkos, and I. T. Monroy, “Experimental demonstration of mixed formats and bit rates signal allocation for spectrum-flexible optical networking,” in Optical Fiber Communication Conf., 2012, OW3A.7.

Monroy, I.

D. Zibar, R. Sambaraju, A. Caballero, J. Herrera, U. Westergren, A. Walber, J. Jensen, J. Marti, and I. Monroy, “High-capacity wireless signal generation and demodulation in 75- to 110-GHz band employing all-optical OFDM,” IEEE Photon. Technol. Lett., vol. 23, no. 12, pp. 810–812, June2011.
[CrossRef]

Murakami, S.

T. Xia, G. Wellbrock, Y.-K. Huang, E. Ip, M.-F. Huang, Y. Shao, T. Wang, Y. Aono, T. Tajima, S. Murakami, and M. Cvijetic, “Field experiment with mixed line-rate transmission (112-Gb/s, 450-Gb/s, and 1.15-Tb/s) over 3560 km of installed fiber using filterless coherent receiver and EDFAs only,” in Optical Fiber Communication Conf., 2011, PDPA3.

Ohara, T.

M. Jinno, T. Ohara, Y. Sone, A. Hirano, O. Ishida, and M. Tomizawa, “Elastic and adaptive optical networks: possible adoption scenarios and future standardization aspects,” IEEE Commun. Mag., vol. 49, no. 10, pp. 164–172, Oct.2011.
[CrossRef]

Peckham, D. W.

S. Chandrasekhar, X. Liu, B. Zhu, and D. W. Peckham, “Transmission of a 1.2-Tb/s 24-carrier no-guard-interval coherent OFDM superchannel over 7200-km of ultra-large-area fiber,” in 35th European Conf. on Optical Communication (ECOC), Sept.2009, vol. 2009-Supplement, pp. 1–2.

Qiu, W.

Ruiz, M.

L. Velasco, M. Klinkowski, M. Ruiz, V. López, and G. Junyent, “Elastic spectrum allocation for variable traffic in flexible-grid optical networks,” in Nat. Fiber Optic Engineers Conf., 2012, JTh2A.39.

Sambaraju, R.

D. Zibar, R. Sambaraju, A. Caballero, J. Herrera, U. Westergren, A. Walber, J. Jensen, J. Marti, and I. Monroy, “High-capacity wireless signal generation and demodulation in 75- to 110-GHz band employing all-optical OFDM,” IEEE Photon. Technol. Lett., vol. 23, no. 12, pp. 810–812, June2011.
[CrossRef]

Savory, S. J.

S. J. Savory, “Digital coherent optical receivers: algorithms and subsystems,” IEEE J. Sel. Top. Quantum Electron., vol. 16, no. 5, pp. 1164–1179, Sept.–Oct.2010.
[CrossRef]

Shao, Y.

Y.-K. Huang, E. Ip, P. N. Ji, Y. Shao, T. Wang, Y. Aono, Y. Yano, and T. Tajima, “Terabit/s optical superchannel with flexible modulation format for dynamic distance/route transmission,” in Optical Fiber Communication Conf., 2012, OM3H.4.

T. Xia, G. Wellbrock, Y.-K. Huang, E. Ip, M.-F. Huang, Y. Shao, T. Wang, Y. Aono, T. Tajima, S. Murakami, and M. Cvijetic, “Field experiment with mixed line-rate transmission (112-Gb/s, 450-Gb/s, and 1.15-Tb/s) over 3560 km of installed fiber using filterless coherent receiver and EDFAs only,” in Optical Fiber Communication Conf., 2011, PDPA3.

Shen, J.

Sone, Y.

M. Jinno, T. Ohara, Y. Sone, A. Hirano, O. Ishida, and M. Tomizawa, “Elastic and adaptive optical networks: possible adoption scenarios and future standardization aspects,” IEEE Commun. Mag., vol. 49, no. 10, pp. 164–172, Oct.2011.
[CrossRef]

M. Jinno, H. Takara, B. Kozicki, Y. Tsukishima, Y. Sone, and S. Matsuoka, “Spectrum-efficient and scalable elastic optical path network: architecture, benefits, and enabling technologies,” IEEE Commun. Mag., vol. 47, no. 11, pp. 66–73, Nov.2009.
[CrossRef]

Tafur Monroy, I.

I. Tafur Monroy, D. Zibar, N. Guerrero Gonzalez, and R. Borkowski, “Cognitive Heterogeneous Reconfigurable Optical Networks (CHRON): enabling technologies and techniques,” in 13th Int. Conf. on Transparent Optical Networks (ICTON), June 2011.

Tajima, T.

T. Xia, G. Wellbrock, Y.-K. Huang, E. Ip, M.-F. Huang, Y. Shao, T. Wang, Y. Aono, T. Tajima, S. Murakami, and M. Cvijetic, “Field experiment with mixed line-rate transmission (112-Gb/s, 450-Gb/s, and 1.15-Tb/s) over 3560 km of installed fiber using filterless coherent receiver and EDFAs only,” in Optical Fiber Communication Conf., 2011, PDPA3.

Y.-K. Huang, E. Ip, P. N. Ji, Y. Shao, T. Wang, Y. Aono, Y. Yano, and T. Tajima, “Terabit/s optical superchannel with flexible modulation format for dynamic distance/route transmission,” in Optical Fiber Communication Conf., 2012, OM3H.4.

Takara, H.

M. Jinno, H. Takara, B. Kozicki, Y. Tsukishima, Y. Sone, and S. Matsuoka, “Spectrum-efficient and scalable elastic optical path network: architecture, benefits, and enabling technologies,” IEEE Commun. Mag., vol. 47, no. 11, pp. 66–73, Nov.2009.
[CrossRef]

Tomizawa, M.

M. Jinno, T. Ohara, Y. Sone, A. Hirano, O. Ishida, and M. Tomizawa, “Elastic and adaptive optical networks: possible adoption scenarios and future standardization aspects,” IEEE Commun. Mag., vol. 49, no. 10, pp. 164–172, Oct.2011.
[CrossRef]

Tomkos, I.

K. Christodoulopoulos, I. Tomkos, and E. Varvarigos, “Elastic bandwidth allocation in flexible OFDM-based optical networks,” J. Lightwave Technol., vol. 29, no. 9, pp. 1354–1366, May2011.
[CrossRef]

K. Christodoulopoulos, I. Tomkos, and E. Varvarigos, “Dynamic bandwidth allocation in flexible OFDM-based networks,” in Optical Fiber Communication Conf., 2011, OTuI5.

R. Borkowski, F. Karinou, M. Angelou, V. Arlunno, D. Zibar, D. Klonidis, N. G. Gonzalez, A. Caballero, I. Tomkos, and I. T. Monroy, “Experimental demonstration of mixed formats and bit rates signal allocation for spectrum-flexible optical networking,” in Optical Fiber Communication Conf., 2012, OW3A.7.

Tsukishima, Y.

M. Jinno, H. Takara, B. Kozicki, Y. Tsukishima, Y. Sone, and S. Matsuoka, “Spectrum-efficient and scalable elastic optical path network: architecture, benefits, and enabling technologies,” IEEE Commun. Mag., vol. 47, no. 11, pp. 66–73, Nov.2009.
[CrossRef]

van den Borne, D.

D. van den Borne, “Robust optical transmission systems: modulation and equalization,” Ph.D. dissertation, Technische Universiteit Eindhoven, 2008 [Online]. Available: http://repository.tue.nl/633535.

Varvarigos, E.

K. Christodoulopoulos, I. Tomkos, and E. Varvarigos, “Elastic bandwidth allocation in flexible OFDM-based optical networks,” J. Lightwave Technol., vol. 29, no. 9, pp. 1354–1366, May2011.
[CrossRef]

K. Christodoulopoulos, I. Tomkos, and E. Varvarigos, “Dynamic bandwidth allocation in flexible OFDM-based networks,” in Optical Fiber Communication Conf., 2011, OTuI5.

Velasco, L.

L. Velasco, M. Klinkowski, M. Ruiz, V. López, and G. Junyent, “Elastic spectrum allocation for variable traffic in flexible-grid optical networks,” in Nat. Fiber Optic Engineers Conf., 2012, JTh2A.39.

Walber, A.

D. Zibar, R. Sambaraju, A. Caballero, J. Herrera, U. Westergren, A. Walber, J. Jensen, J. Marti, and I. Monroy, “High-capacity wireless signal generation and demodulation in 75- to 110-GHz band employing all-optical OFDM,” IEEE Photon. Technol. Lett., vol. 23, no. 12, pp. 810–812, June2011.
[CrossRef]

Wang, T.

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Figures (5)

Fig. 1
Fig. 1

(Color online) (a) General overview of the experimental setup. QAM Tx: 16-QAM transmitter; QPSK Tx: QPSK transmitter; ECL: external cavity laser; PC: polarization controller; PPG: pulse pattern generator; Comb gen.: 14 GHz comb generator; EDFA: erbium-doped fiber amplifier; VOA: variable optical attenuator; PolMux: polarization multiplexing stage; SMF: single-mode fiber; ASE loading: amplified spontaneous emission loading stage; OSA: optical spectrum analyzer; OBPF: optical bandpass filter; DSO: digital sampling oscilloscope; offline DSP: offline digital signal processing stage. X is a monitoring point at which the spectra in Fig. 4 were taken. (b) Electrical part of the 16-QAM transmitter. LPF: low-pass filter; MZ: Mach–Zehnder modulator. (c) Details of the comb generator.

Fig. 2
Fig. 2

Outline of the offline digital signal processing algorithm chain.

Fig. 3
Fig. 3

(Color online) Back-to-back performance of single-carrier 14 Gbaud PDM-16-QAM (squares) and PDM-QPSK (circles) in the experimental setup. Upper insets show both received constellations at a BER of approximately 1 × 1 0 3 , while lower insets depict optical intensity eye diagrams captured at monitoring point X (see Fig. 1) for respective modulation formats.

Fig. 4
Fig. 4

Modulated and unmodulated (denoted by superscript 0) spectra for all scenarios A–H. The BOI is marked by a gray background.

Fig. 5
Fig. 5

(Color online) BER performance of all scenarios, except for D. Solid curves were fitted to the measured data points. Thick horizontal dashed line denotes the BER threshold set at 1 × 1 0 3 . Thick vertical lines in respective colors show the OSNR corresponding to a crossing between fitted curves and the BER threshold, indicating the ROSNR level for each scenario.

Tables (1)

Tables Icon

Table I Investigated Scenarios and Obtained ROSNR Levels