Abstract

Future long-haul high-bit-rate transmission systems based on short-pulse transmission (e.g. soliton transmission) may require a return-to-zero (RZ) signal format.1 In network applications, the non-return-to-zero (NRZ) format, however, is preferred to the RZ format because of reduced electronic bandwidth requirements and greater timing tolerance. The conversion between the NRZ and RZ signals is a key process to interface all-optical network with high speed transmission systems.2,3 We had carried out an all-optical NRZ-to-RZ format conversion by using a walk-off balanced nonlinear fiber-loop mirror (WBNFLM).4 In this presentation, the reverse process, i.e., all-optical RZ-to-NRZ format conversion, using the WBNFLM is demonstrated. The principle used is the same as the switching mechanism of the WBNFLM with a cw probe beam.5 In this scheme, the extinction ratio degradation of the converted NRZ signals, which is a main drawback of previously reported works, is removed.

© 1996 Optical Society of America

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References

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