Abstract
We comprehensively analyze multiple WDM channels RZ-to-NRZ format conversion using a single microring resonator. The scheme relies on simultaneous suppression of the first order harmonic components in the spectra of all the RZ channels. An optimized silicon microring resonator with free spectral range of 100 GHz and Q value of 7900 is designed and fabricated for this purpose. Multi-channel RZ-to-NRZ format conversion is demonstrated experimentally at 50 Gbit/s for WDM channels with 200 GHz channel spacing using the fabricated device. Bit error rate (BER) measurements show very good conversion performances for the scheme.
Highlights
Optical format conversion is an important functionality in nodes interfacing optical networks operating with different modulation formats
RZ-to-NRZ format conversion has been demonstrated for single channel using an optical fiber DI [3]
A semiconductor optical amplifier (SOA) interferometic wavelength converter has been applied for single channel RZ-to-NRZ format conversion [4], but the scheme is relatively complex, and the SOA will introduce extra power consumption
Summary
Optical format conversion is an important functionality in nodes interfacing optical networks operating with different modulation formats. Multiple channels dense WDM (DWDM) NRZ-toRZ regenerative format conversion at 10 and 20 Gbit/s has been demonstrated using a single phase modulator (PM) and a fiber delay-interferometer (DI) [1,2]. A new compact scheme based on an optical nano-fiber ring resonator has been demonstrated for single channel RZ-to-NRZ format conversion [5]. Such a nano-fiber ring resonator is very sensitive to the surrounding environment, making it unstable. A simple compact and stable integrated scheme for simultaneous multiple WDM channels RZ-to-NRZ format conversion has still not been demonstrated. We experimentally demonstrate simultaneous four WDM channels RZ-to-NRZ format conversion at 50 Gbit/s based on a specially fabricated single silicon MRR. Due to its CMOS-compatible fabrication process, compact size for optical integration and stable operation, the proposed scheme is suitable for practical applications
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