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Adaptively modulated optical OFDM modems utilizing RSOAs as intensity modulators in IMDD SMF transmission systems

J. L. Wei, A. Hamié, R. P. Gidding, E. Hugues-Salas, X. Zheng, S. Mansoor, and J. M. Tang

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Abstract

Detailed investigations of the transmission performance of adaptively modulated optical orthogonal frequency division multiplexed (AMOOFDM) signals converted using reflective semiconductor optical amplifiers (RSOAs) are undertaken over intensity-modulation and direct-detection (IMDD) single-mode fiber (SMF) transmission systems for WDM-PONs. The theoretical RSOA model adopted for modulating the AMOOFDM signals is experimentally verified rigorously in the aforementioned transmission systems incorporating recently developed real-time end-to-end OOFDM transceivers. Extensive performance comparisons are also made between RSOA and SOA intensity modulators. Optimum RSOA operating conditions are identified, which are independent of RSOA rear-facet reflectivity and very similar to those corresponding to SOAs. Under the identified optimum operating conditions, the RSOA and SOA intensity modulators support the identical AMOOFDM transmission performance of 30Gb/s over 60km SMFs. Under low-cost optical component-enabled practical operating conditions, RSOA intensity modulators with rear-facet reflectivity values of >0.3 outperform considerably SOA intensity modulators in transmission performance, which decreases significantly with reducing RSOA rear-facet reflectivity and optical input power. In addition, results also show that use can be made of the RSOA/SOA intensity modulation-induced negative frequency chirp to improve the AMOOFDM transmission performance in IMDD SMF systems.

©2010 Optical Society of America

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Figures (11)
Fig. 1
Fig. 1 Transmission system diagram together with block diagrams of the AMOOFDM transmitter and receiver.

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Fig. 2
Fig. 2 Schematic diagram of RSOA intensity modulator.

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Fig. 3
Fig. 3 RSOA/SOA optical gain characteristics under different operating conditions. (a) Optical gain versus optical input power with the bias current being fixed at 100mA. (b)-(d) Optical gain versus bias current for different optical input powers: −10dBm for (b); 10dBm for (c) and 22.5dBm for (d).

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Fig. 4
Fig. 4 Contour plots of signal line rate as a function of CW optical input power and bias current for RSOAs with different rear-facet reflectivity values of 0.3 in (a), 0.6 in (b) and 0.9 in (c) and SOAs in (d). An IMDD 60km SMF transmission system is considered.

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Fig. 5
Fig. 5 Signal line rate versus PTP value of driving current for different RSOA rear-facet reflectivity and optical input powers.

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Fig. 6
Fig. 6 Signal line rate versus transmission distance for RSOA and SOA intensity modulators operating under identified optimum conditions.

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Fig. 9
Fig. 9 Effective carrier lifetime (a) and signal extinction ratio (b) versus RSOA rear-facet reflectivity for different optical powers.

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Fig. 7
Fig. 7 Comparisons between simulations and real-time experimental measurements. (a) RSOA intensity modulator frequency response, and (b)-(g) constellations of representative subcarriers. (b)-(d) are simulated results and (e)-(g) are experimental results.

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Fig. 8
Fig. 8 Signal line rate versus rear-facet reflectivity value of RSOA subject to different optical input powers.

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Fig. 10
Fig. 10 Signal line rate versus reach performance for different optical input powers and rear-facet reflectivity values.

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Fig. 11
Fig. 11 Signal line rate versus reach performance for the cases of including and excluding chromatic dispersion. Optical input power is fixed at −10dBm.

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Tables (1)

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Table 1 RSOA, SOA, SMF and PIN Parameters

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Equations (4)

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G R S O A ( T ) = P o u t ( T ) / P i n ( T ) = r exp [ 2 h ( T ) ]
G S O A ( T ) = P z = L + ( T ) / P i n ( T ) = exp [ h ( T ) ]
R s i g n a l = ∑ k = 2 M s s k = ∑ k = 2 M s n k T b = f s ∑ k = 2 M s n k 2 M s ( 1 + η )
B E R T = ∑ k = 2 M s E n k ∑ k = 2 M s B i t k
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