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Optical frequency tripling with improved suppression and sideband selection

Manoj P. Thakur, Maria C.R. Medeiros, Paula Laurêncio, and John E. Mitchell

Open Access Open Access

Abstract

A novel optical dispersion tolerant millimetre-wave radio-over-fibre system using optical frequency tripling technique with enhanced and selectable sideband suppression is demonstrated. The implementation utilises cascaded optical modulators to achieve either an optical single sideband (OSSB) or double sideband-suppressed carrier (DSB-SC) signal with high sideband suppression. Our analysis and simulation results indicate that the achievable suppression ratio of this configuration is only limited by other system factors such as optical noise and drifting of the operational conditions. The OSSB transmission system performance is assessed experimentally by the transport of 4 WiMax channels modulating a 10 GHz optical upconverted RF carrier as well as for optical frequency doubling and tripling. The 10 GHz and tripled carrier at 30 GHz are dispersion tolerant resulting both in an average relative constellation error (RCE) of −28.7 dB after 40 km of fibre.

©2011 Optical Society of America

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Figures (12)
Fig. 1
Fig. 1 Schematic of the proposed ER compensation scheme.

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Fig. 2
Fig. 2 Dependence of the optical carrier suppression ratio (OCSR) on the modulation index of the phase modulator, m2 and the phase shift β. (a) OCSR contour plot versus m2 and β for a DD-MZM with ER = 30 dB. (b) Optical power of the optical carrier, first harmonic and second harmonic after ER compensation for the DD-MZM with ER = 30 dB. (c) same as (a) for a DD-MZM with ER = 20 dB. (d) Same as (b) for a DD-MZM with ER = 20 dB.

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Fig. 3
Fig. 3 Optical spectra, obtained by simulation using the VPI Transmission MakerTM, for m1 = 0.2, m2 = 0.08 and β = 21°. (a) At the output of the DD-MZM. (b) At the output of the PM.

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Fig. 4
Fig. 4 Dependence of the OFSSR on the modulation index of the phase modulator, m2 and the phase shift β. (a) OFSSR contour plot versus m2 and β for a DD-MZM with ER = 30 dB. (b) Optical power of the optical carrier, first harmonics and second harmonics after ER compensation for the DD-MZM with ER = 30 dB. (c) same as (a) for a DD-MZM with ER = 20 dB. (d) Same as (b) for a DD-MZM with ER = 20 dB.

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Fig. 5
Fig. 5 OSSB optical spectra, obtained by simulation using the VPI Transmission MakerTM, for m1 = 0.2, m2 = 0.2 and β = 14.24°. (a) At the output of the DD-MZM. (b) At the output of the PM.

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Fig. 6
Fig. 6 Cascaded DD-MZM and PM (tuneable to DSB-SC and OSSB configuration)

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Fig. 7
Fig. 7 OSSB with modulation data signal leakage

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Fig. 8
Fig. 8 DSB-SC with modulation data signal leakage

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Fig. 9
Fig. 9 RF power variation with fibre length for OSSB configuration

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Fig. 10
Fig. 10 RCE variation of down-converted WiMax signal.

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Fig. 11
Fig. 11 Measured phase noise of source and upconverted signal.

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Fig. 12
Fig. 12 Demodulated 64 QAM WiMax signal constellation diagrams obtained after phase and amplitude corrections at the receiver. (a) Electrical back-back. (b) RF = 30 GHz & IF = 440 MHz. (c) RF = 30 GHz & IF = 460 MHz. (d) RF = 30 GHz & IF = 480 MHz. (e) RF = 30 GHz & IF = 500 MHz.

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Tables (1)

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TABLE 1 Source and Upconverted RF Phase Noise

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Equations (4)

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V A1 ( t )=Asin( 2π f RF t )− V DC1 V A2 ( t )=−Asin( 2π f RF t )+ V DC2
E MZ ( t )= E i ( t ){ η[ e j π V A1 ( t ) V Aπ + e j π V A2 ( t ) V Aπ ]+ξ e j π V A2 ( t ) V Aπ }
E o ( t )= E i ( t ){ η[ e j π V A1 ( t ) V Aπ + e j π V A2 ( t ) V Aπ ]+ξ e j π V A2 ( t ) V Aπ } e j π V B ( t ) V Bπ
E o ( t )= E i ( t ) ∑ n=−∞ ∞ j n e jn ω RF t { η J n ( π M 1 )cos[ n( θ 1 − θ 2 ) 2 − ϕ 1 + ϕ 2 2 ] e j[ n( θ 1 + θ 2 ) 2 − ϕ 1 − ϕ 2 2 ] ︷ X + [ η( J n ( π M 2 )− J n ( π M 1 ) )+ξ ] e j( n θ 2 + ϕ 2 ) ︷ Y }
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