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Published on: April 1, 2020
Simple carrier-phase estimator for high-speed RSOA-based coherent WDM PON.
A new carrier phase estimation technique accurately detects high-speed phase-shift-keying (PSK) signals from bandwidth-limited reflective semiconductor optical amplifiers (RSOAs). This method enables reliable data transmission in advanced wavelength-division-multiplexed passive optical networks (WDM PONs).
Area of Science:
- Optical communications
- Photonics
- Signal processing
Background:
- Reflective semiconductor optical amplifiers (RSOAs) offer cost-effective phase modulation for high-speed wavelength-division-multiplexed passive optical networks (WDM PONs).
- Accurate carrier phase estimation is crucial for detecting phase-shift-keying (PSK) signals generated by RSOAs in digital coherent receivers.
- Conventional carrier phase estimation methods fail at high baud rates exceeding the RSOA's modulation bandwidth.
Purpose of the Study:
- To develop a simple and effective carrier phase estimation technique for high-speed PSK signals (>10 Gb/s) generated by bandwidth-limited RSOAs.
- To overcome the limitations of existing algorithms in accurately estimating carrier phase under challenging modulation conditions.
Main Methods:
- A novel carrier phase estimation technique is proposed.
- The technique measures the angular direction of the opening in the phasor diagram trajectory.
- This method is applied to high-speed PSK signals generated by RSOAs with limited modulation bandwidth.
Main Results:
- The developed technique successfully estimates the carrier phase of high-speed PSK signals.
- Demonstrated upstream transmission of a 25.78-Gb/s quadrature phase-shift-keying (QPSK) signal over a 60-km reach coherent WDM PON.
- The RSOA used had a 3-dB bandwidth of 3.2 GHz, highlighting the technique's effectiveness with bandwidth-limited devices.
Conclusions:
- The proposed simple carrier phase estimation technique is suitable for high-speed (>10 Gb/s) PSK signals from bandwidth-limited RSOAs.
- This advancement facilitates cost-effective and high-performance WDM PONs.
- Enables reliable upstream data transmission in advanced optical network architectures.
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