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Nonlinearity compensation using optical phase conjugation deployed in discretely amplified transmission systems
Optics Express
|September 7, 2018
Summary
A new equation predicts noise in optical amplifier systems. Mid-link optical parametric compensation (OPC) effectiveness decreases with increased signal bandwidth, limiting performance gains.
Area of Science:
- Optical Communications
- Nonlinear Optics
- Signal Processing
Background:
- Discretely amplified systems face performance limitations due to nonlinear noise.
- Mid-link optical parametric compensation (OPC) is a technique to mitigate these nonlinearities.
- The efficiency of mid-link OPC is influenced by system parameters like signal bandwidth and amplifier spacing.
Purpose of the Study:
- To introduce a closed-form equation for predicting residual nonlinear noise in mid-link OPC-assisted systems.
- To analyze the impact of signal bandwidth on the performance enhancement provided by mid-link OPC.
- To investigate the relationship between amplifier spacing and performance gains.
Main Methods:
- Development of a closed-form equation for residual nonlinear noise ratio.
- Validation through numerical simulations.
- Experimental testing of 2x, 4x, and 8x28Gbaud Polarization Multiplexed Quadrature Phase Shift Keying (PM-QPSK) systems with mid-link OPC.
Main Results:
- The model accurately predicts performance reduction with increasing signal bandwidth.
- Uncompensated signal-signal interactions were identified as a limiting factor for performance improvement.
- Shorter amplifier spacing is predicted to enhance performance.
- Experimental results showed reach enhancements of 43%, 32%, and 24% for 2x, 4x, and 8x28Gbaud systems, respectively.
- Compensation efficiency is highly dependent on the number of channels (bandwidth).
Conclusions:
- The developed equation provides a valuable tool for predicting system performance.
- Mid-link OPC effectiveness is bandwidth-limited, necessitating careful system design.
- Optimizing amplifier spacing is crucial for maximizing performance enhancement.
- Experimental validation confirms the theoretical predictions regarding mid-link OPC efficiency.
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