DWDM BPSK and OOK Communication with Clock-Free RZ Carriers Self-Started by Feedback Optoelectronic Oscillator
Date Issued
2012
Date
2012
Author(s)
Chi, Yu-Chieh
Abstract
The self-starting optoelectronic oscillator (OEO) simultaneous generating synthesizer-free microwave clock and pulsed carrier with ultra low jitter at high-repetition-rate have emerged as a key component for the high-bit-rate optical time-division multiplexing (OTDM) communication system. In this dissertation, the synthesizer-free 10 and 40-GHz return-to-zero (RZ) carriers self-started by the feedback OEO for dense wavelength division multiplexing (DWDM) access network with 10 and 40-Gbit/s down-stream RZ binary phase-shift keying (BPSK) and reused up-stream RZ on-off-keying (RZ-OOK) data is demonstrated respectively. First, a synthesizer-free 10-Gbit/s RZ-OOK data generator is demonstrated by gain-switching a Fabry-Perot laser diode (FPLD) or a distributed feedback laser diode (DFBLD) with the same self-started OEO feedback loop. By self-feedback triggering the microwave clock with the OEO, the modulation bandwidth of the transistor outline (TO-56) can packaged laser diode can be self-pulsating to generate optical RZ carrier at 10-GHz repetition rate.
In the external modulation scheme, the synthesizer-free self-starting optoelectronic oscillating pulsator based single- and multi-channel optical RZ carrier, microwave clock and data (OOK and BPSK) generator are demonstrated by using an integrated DFBLD and electro-absorption modulator (DFBLD-EAM) link and a injection mode-locked semiconductor optical amplifier fiber laser (SOAFL) respectively. Moreover, the theoretical models of the self-pulsating EAM and the injection mode-locking SOAFL are numerically analyzed respectively to improve the self-pulsating performance of the optical RZ carriers. The jitter of the self-started RZ carrier optimized with the true-time-delay incorporated OEO feedback loop with lowest single sideband (SSB) phase noise is also theoretically and experimentally performed. For synthesizer-free RZ-BPSK data, detuning the Delayed interferometer DC bias to match the frequency comb spacing with the RZ carrier frequency further improves the transmission performance.
Subsequently, the distinguished transmission performances of the 10-Gbit/s RZ-OOK data carried on the gain-switched DFBLD, the nonlinearly modulated EAM, and the injection mode-locked SOAFL pulse-train triggered with the self-feedback OEO are compared. The OEO driven gain-switching DFBLD with insufficient pulse extinction is not particularly suitable for RZ data generation owing to its intense relative intensity noise (RIN) and large timing jitter under threshold operation. In addition, although the self-pulsated harmonic mode-locking SOAFL can simultaneously generate 4-6 DWDM-channel RZ carriers, the self-pulsated RZ carrier/data generated from DFBLD under the OEO-triggered nonlinear-EAM modulation still have the better performances in many aspects such as jitter, pulsewidth, pulse on/off extinction ratio (ER), and signal-to-noise ratio (SNR) because of the sufficient modulating amplitude. Such an integrated DFBLD-EAM link based self-starting OEO is a new approach for the synthesizer-free optical clock and RZ-OOK/BPSK data generation. Finally, the self-started 10 and 40-GHz DFBLD-EAM and Mach-Zehnder intensity modulator (MZM) RZ carriers are performed to demonstrate bi-directional down-stream RZ-BPSK and up-stream re-used RZ-OOK transmissions at 10 and 40 Gbit/s respectively. This study explores the new application of an OEO self-pulsated RZ carrier in further hybrid BPSK-OOK transmission network and its reusing capability.
Subjects
self-starting optoelectronic oscillator
gain-switching
electro-absorption modulator
harmonic mode-locking
semiconductor optical amplifier fiber laser
return-to-zero binary phase-shift keying
return-to-zero on-off-keying
Mach-Zehnder intensity modulator
optical time-division multiplexing
dense wavelength division multiplexing
Type
thesis
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