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Optica Publishing Group
  • Optical Fiber Communications Conference
  • OSA Trends in Optics and Photonics (Optica Publishing Group, 2002),
  • paper ThGG81

All-optical carrier-suppressed pulse generator by a single semiconductor optical amplifier

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Abstract

Optical carrier-suppressed return-to-zero (CS-RZ) format has been the subject of intense study in recent years for its high spectral efficiency as well as remarkable tolerance of chromatic dispersion and nonlinear fading in high-speed fiber communication systems.1–3 With the widespread deployment of CS-RZ data transmission, all-optical 3R signal regeneration for CS-RZ format is of great importance when performing signal processing in the optical domain. As an example, the schematic of 10 Gb/s CS-RZ signal regeneration is shown in Fig. 1. The 5 GHz optical clock extracted from the re-amplified 10 Gb/s CS-RZ data stream is transformed into 10 GHz carrier-suppressed (CS) clock by the pulse generator (typically a LiNbO3 Mach-Zehnder modulator biased at the transmission null) and injected into the optical nonlinear gate. The relative phase difference between adjacent CS clock pulses is constant π so that the intersymbol interference could be significantly reduced.4

© 2002 Optical Society of America

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