Andersen, Peter Andreas

Berg, Kim Skaalum

Clausen, Anders

Folkenberg, J. R.

Hanberg, J.

Hanberg, K. P.

Hoppe, Karsten

Jeppesen, Palle

Oxenløwe, Leif Katsuo

Siahlo, Andrei

A highly nonlinear 50 m long photonic crystal fibre with zero-dispersion wavelength at 1552 nm is investigated as a 40 to 10 Gb/s demultiplexer in a complete transmission system. 160 to 10 Gb/s is feasible

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Downloaded from orbit.dtu.dk on: Dec 17, 2017Complete transmission system with a highly non-linear dispersion shifted photoniccrystal fibre as the demultiplexerOxenløwe, Leif Katsuo; Siahlo, Andrei; Andersen, Peter Andreas; Berg, Kim Skaalum; Clausen, Anders;Jeppesen, Palle; Hanberg, K. P.; Folkenberg, J. R.; Hoppe, Karsten; Hanberg, J.Published in:Technical Digest Conference on Lasers and Electro-OpticsPublication date:2003Document VersionPublisher's PDF, also known as Version of recordLink back to DTU OrbitCitation (APA):Oxenløwe, L. K., Siahlo, A., Andersen, P. A., Berg, K. S., Clausen, A., Jeppesen, P., ... Hanberg, J. (2003).Complete transmission system with a highly non-linear dispersion shifted photonic crystal fibre as thedemultiplexer. In Technical Digest Conference on Lasers and Electro-Optics (Vol. Paper CFJ1). IEEE.CFJl Complete transmission system with a highly non-linear dispersion shifted photonic crystal fibre as the demultiplexer L.K. Oxenl~w~e*, A.I. Siahlo*, P.A. Andersen, K.S. Berg", A.T. Clausen" and P. Jeppesen COM Center, Technical University ofDenmark, Buzlding 345K DK-2800Lyngby, Denmark Phone i 4 5  45253784, Fm:+45 45936581, E-mail:l@com.dtu.dk *Partly sponsored by the ISTproject TOPRATE (ET-2000-28657) Crystal Fibre NS,  Blokken 84, Birkergd DK-3460, Denmark G i p  Aps -An Intel Coinpany, Mzleparken 22, DK-2740 Skovlunde Denmark K.P. Hansen and J.R Folkenberg K. Hoppe and J. Hanberg Abstract: A highly non-linear 50 m long photonic crystal fibre with zero-dispersion wavelength at 1552 nm is investigated as a 40 to 10 Gb/s demultiplexer in a complete transmission system. 160 to 10 Gb/s is feasible. 02000 Optical Society of America OCIS codes: (060.2360) Fiber optics links and subsystems; (060.4510) Optical Communications 1. Introduction Increasing channel rates in communication systems requires fast switches such as a non-linear optical loop mirror (NOLM) [l]. A NOLM usually requires a long non-linear fibre to generate sufficient phase shift in the interferometer, but by using a photonic crystal fibre (PCF) th~s length may be considerably reduced. In this paper, we show the characteristics of an only 50 m long highly non-linear PCF in a NOLM in a complete transmission experiment at 40 Gb/s and show its potential for higher bit rates. 2. Principle and experimental set-up The experimental set-up is shown in Fig. 1. The NOLM contains the PCF with zero dispersion at 1552 nm [2] and .............. o , ,  . I I 1 clock and data p>, I 1, -20 -60 1530 1535 1540 1545 1550 1555 wavelength [nm] Fig. 1. Schematic set-up a non-linear coefficient of 18 W-'km-'. To synchronise the receiver to the data, a base rate clock signal is transmitted with the data signal. An electroabsorption modulator (EAM) generates the clock at 12 - 1535 nm (Fig. 1 right). The o/e-converted transmitted clock drives the control pulse source (gain-switched DFB laser (GS-DFB), FWHM - 12 ps, A3 - 1556 nm), and triggers the preamplified BER receiver. A mode-locked fibre ring laser (ML-FRL) provides the data pulses (FWHM - 3 ps, at 10 GHz and hi - 1549 nm. The pulse train is data modulated (MOD) and the 10 Gb/s data is multiplexed to 40 Gb/s (MUX). The signals are transmitted over 25 km SMF and 25 km IDF with zero dispersion at 1549 run. After transmission the clock and data are separated by filters. The data is switched through the NOLM only when a control pulse is injected due to the optical Kerr effect [3]. 3. Characterisations and BER performance Fig. 2 left shows that more data (at hi) is switched through as the control power is increased with a switching Authorized licensed use limited to: Danmarks Tekniske Informationscenter. Downloaded on February 24,2010 at 08:29:36 EST from IEEE Xplore.  Restrictions apply. CFJl 800 I . ,  . , . , . , I I I ,  700 switching window: -14 600 y- -16 500 4 400 -18 .% 300 O -20 -24 -26 100 -28 0 20 40 60 80 100 120 IPS1 18 20 22 24 26 28 30 avg. ctrl power (ha) [dBm] Fig. 2. Switching characteristics of the PCF-based NOLM. Left: Transmitted CW power as function of control power (contrast: 15 dEQ Right: Autocorrelation of the induced switching window (width: 9 ps). contrast of 15 dB. As typical for a NOLM, the switching window is narrower than the control pulse - only 9 ps wide (Fig. 2 right). Fig. 3 shows the clear and open eye diagmms after transmission. All four demultiplexed channels are error free. The penalties compared to the back-to-back arise from a combination of multiplexing, transmission and demultiplexing, aiid span from 1.9 dB to 4.8 dB. The different penalties are caused by an imperfect multiplexer. m n 7  8 9 +n I ”  -40 -38 -36 -34 -32 -30 -28 receiver power [dBm] Fig. 3. BER performance. Left: BER curves. Right: 40 Gb/s eye diagram and demuxed 10 Gb/s eye. The demultiplexing penalty is low, since there is less than 0.1 ps walk-off in the NOLM and a high contrast for switching. This system operates at 40 Gb/s, but can operate at bit rates as high as 160 Gb/s if narrower control pulses are used as in [4]. 4. Conclusion We have demonstrated an entire transmission system with a PCF-based demultiplexer operating at 40 Gbls and with potential for 160 Gb/s operation. 5. References 1.  M. Nakazawa et al, ”1.28 Tbitk - 70 k q ~  OTDM transmission using third- and fourth-order simultaneous dispersion compensation with a phase modulator,” Electron. Lett. 36(24), 2027-2029 (2000). 2. K.P. Hansen et al, ”Highly Nonlinear Photonic Crystal Fiber with Zero-Dispersion at 1.55 p,” in Proceedings of OFC’02 (2002), post deadline paper FA9 3. M. Jinno, “Effects of Group Velocity Dispersion on SelfCross Phase Modulation in a Nonlinear Sagnac Interferometer,” J .  Lightwave Technol. 10(8), page 1167-1 178 (1992). Authorized licensed use limited to: Danmarks Tekniske Informationscenter. Downloaded on February 24,2010 at 08:29:36 EST from IEEE Xplore.  Restrictions apply. CF J1 4. L.K. Oxenlowe et al, ” A photonic crystal fibre used as a 160 to 10 Gb/s demultiplexer,” in Proceedings of OECC 2002 (2002), post deadline paper PD-1-4. Authorized licensed use limited to: Danmarks Tekniske Informationscenter. Downloaded on February 24,2010 at 08:29:36 EST from IEEE Xplore.  Restrictions apply. 

Complete transmission system with a highly non-linear dispersion shifted photonic crystal fibre as the demultiplexer

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Complete transmission system with a highly non-linear dispersion shifted photonic crystal fibre as the demultiplexer

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