Abstract

We have realized a novel optical modulation format conversion using double-sideband suppressed-carrier modulation. An optical wideband frequency-shift-keying (FSK) signal, generated by an external FSK modulator, can be directly converted into an optical phase-shift-keying (PSK) signal, where the FSK signal having two spectral components was fed to an optical intensity modulator followed by an optical bandpass filter. Optical frequency of the FSK signal was mapped into optical phase of the bandpass filter output whose phase deviation depends on a chirp of the FSK signal. We demonstrated modulation format conversion from FSK to PSK at 10 Gbps, by using a high-speed optical FSK modulator and a dual electrode Mach-Zehnder intensity modulator.

© 2005 Optical Society of America

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References

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    [CrossRef]
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    [CrossRef] [PubMed]
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Electron. Lett.

K. Iwashita, T. Imai, T. Matsumoto and G. Motosugi, �??400 Mbit/s optical FSK transmission experiment over 270 km of single-mode fibre,�?? Electron. Lett. 22, 164�??165 (1986)
[CrossRef]

T. Kawanishi, T. Sakamoto, S. Shinada, M. Izutsu, K. Higuma, T. Fujita and J. Ichikawa, �??LiNbO3 high-speed optical FSK modulator,�?? Electron. Lett. 40, 691�??692 (2004)
[CrossRef]

IEEE Photonics Technol. Lett.

A. H. Gnauck, G. Raybon, S. Chandrasekhar, J. Leuthold, C. Doerr, L. Stulz, and E. Burrows �??25x 40-Gb/s Copolarized DPSK Transmission Over 12x100-km NZDF With 50-GHz Channel Spacing,�?? IEEE Photonics Technol. Lett. 15, 467�??469 (2003)
[CrossRef]

J. Lightwave Technol.

Optics Express

J. J. Vegas Olmos, I. Tafur Monroy and A. M. J. Koon, �??High bit-rate combined FSK/IM modulated optical signal generation by using GCSR tunable laser sources,�?? Optics Express 11, 3136�??3140 (2003), <a href= "http://www.opticsexpress.org/abstract.cfm?URI=OPEX-11-23-3136">http://www.opticsexpress.org/abstract.cfm?URI=OPEX-11-23-3136</a>
[CrossRef] [PubMed]

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Figures (5)

Fig. 1.
Fig. 1.

Optical FSK modulator.

Fig. 2.
Fig. 2.

Principle of modulation format conversion from FSK to PSK.

Fig. 3.
Fig. 3.

Conversion from FSK to PSK (α = 0).

Fig. 4.
Fig. 4.

Experimental setup.

Fig. 5.
Fig. 5.

BER curves and eye diagrams.

Equations (12)

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P = e j ω 0 t 2 2 [ e j A m cos ω m t + e j A m cos ω m t e j ϕ A ]
Q = e j ω 0 t 2 2 [ e j A m sin ω m t + e j A m sin ω m t e j ϕ B ] ,
R = e j [ ω 0 t + π 4 + α F ( t ) ] J 1 ( A m ) [ cos F ( t ) e j ω m t + j sin F ( t ) e j ω m t ] ,
F ( t ) A 1 + A 2 2 [ f ( t ) + π 4 ] ,
α A 1 A 2 A 1 + A 2 ,
j sin [ A m sin ( ω m t + ϕ m ) ] ,
S = K e j αF ( t ) [ cos F ( t ) e j ω m t + j sin F ( t ) e j ω m t ]
× { e j ( ω m t + ϕ m ) e j ( ω m t + ϕ m ) } ,
K e j ( ω 0 t + π 4 ) J 1 ( A m ) J 1 ( A m )
T = K [ cos [ F ( t ) ϕ m ] j sin [ F ( t ) ϕ m ] ] e j αF ( t ) ,
T = K 1 + sin 2 F ( t ) sin 2 ϕ m .
T = K e j [ ( 1 ) n α ] F ( t ) e j n π 2 ,

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