All-optical 40Gbit/s format conversion from NRZ to RZ based on SFG in a PPLN waveguide

Jian Wang; Junqiang Sun

doi:10.1117/12.667020

28 January 2006 All-optical 40Gbit/s format conversion from NRZ to RZ based on SFG in a PPLN waveguide

Jian Wang, Junqiang Sun

Proceedings Volume 6025, ICO20: Optical Communication; 60250T (2006) https://doi.org/10.1117/12.667020
Event: ICO20:Optical Devices and Instruments, 2005, Changchun, China

Abstract

A novel all-optical 40Gbit/s NRZ-to-RZ data format conversion scheme based on sum-frequency generation (SFG) interaction in a periodically poled LiNbO³ (PPLN) waveguide is presented for the first time, using a Mach-Zehnder interferometer (MZI). The conversion mechanism relies on the combination of attenuation and nonlinear phase shift Φ_NL induced on the signal field. The performance of the conversion is numerically evaluated, with the result showing that it is more effective to yield Φ_NL when appropriately phase mismatched for SFG process but Φ_NL≈0 when quasi-phase-matching (QPM). Compared with the cascaded second-order nonlinear interactions (SHG+DFG) with the influence of walk-off effect, a high conversion efficiency and good performance are achieved with peak power 500mw and width 2ps of the pump, which can be used in super high-speed situation (40Gbit/s and above). Finally, the inverse process of SFG and corresponding walk-off effect are analyzed and the optimum arrangement of power is proposed, showing that proper power, pump width, and waveguide length are necessary for achieving a satisfied conversion effect.

Citation Download Citation

Jian Wang and Junqiang Sun "All-optical 40Gbit/s format conversion from NRZ to RZ based on SFG in a PPLN waveguide", Proc. SPIE 6025, ICO20: Optical Communication, 60250T (28 January 2006); https://doi.org/10.1117/12.667020

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KEYWORDS

Signal processing

Data conversion

Waveguides

Signal attenuation

Phase shifts

Nonlinear optics

Interferometers

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