Abstract
Simultaneous RZ-OOK to NRZ-OOK and RZ-DPSK to NRZ-DPSK modulation format conversion in a single silicon microring resonator with free spectral range equal to twice the signal bit rate is experimentally demonstrated for the first time at 41.6 Gb/s. By utilizing an optimized custom-made microring resonator with high coupling coefficient followed by an optical bandpass filter with appropriate bandwidth, good conversion performances for both modulation formats are achieved according to the converted signals eye diagrams and bit-error-rate measurements.
Highlights
All optical conversion between different modulation formats is required to introduce enhanced flexibility in future optical networks
Simultaneous RZ-on-off keying (OOK) to non return-to-zero (NRZ)-OOK and RZ-differential phase shift keying (DPSK) to NRZDPSK modulation format conversion in a single silicon microring resonator with free spectral range equal to twice the signal bit rate is experimentally demonstrated for the first time at 41.6 Gb/s
By utilizing an optimized custom-made microring resonator with high coupling coefficient followed by an optical bandpass filter with appropriate bandwidth, good conversion performances for both modulation formats are achieved according to the converted signals eye diagrams and bit-error-rate measurements
Summary
All optical conversion between different modulation formats is required to introduce enhanced flexibility in future optical networks. Single and multi-channel format conversions based on simple passive linear filter devices [5,6,7,8,9,10] have been demonstrated, only applied to on-off keying modulation. Single [13] and multi-channel [14] RZ-to-NRZ format conversion for DPSK have been experimentally demonstrated using a delay interferometer (DI) with half bit delay. Silicon microring resonators (MRRs) are versatile ultra-compact devices that have been widely used for all optical signal processing [15,16]. Multiple channel RZ-OOK to NRZ-OOK format conversion based on a single silicon MRR has already been successfully demonstrated [10]. Clear converted signals eye diagrams and bit-error-rate measurements show the good conversion performance of our scheme
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