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Signal power asymmetry optimisation for optical phase conjugation using Raman amplification
Optics Express
|December 25, 2015
Summary
We optimized signal power asymmetry in Raman amplification, achieving 3% power difference over 62 km. This optimization impacts optical system performance, particularly with mid-link optical phase conjugation.
Area of Science:
- Optical communications engineering
- Photonics and laser technology
Background:
- Advanced Raman amplification schemes are crucial for long-haul optical fiber transmission.
- Controlling in-span signal power asymmetry is a key challenge in optimizing amplifier performance.
Purpose of the Study:
- To numerically optimize in-span signal power asymmetry in advanced Raman amplification.
- To evaluate the impact of optimized power asymmetry on optical systems employing mid-link optical phase conjugation (OPC).
Main Methods:
- Numerical optimization of in-span signal power asymmetry.
- Utilizing a distributed feedback (DFB) Raman laser amplifier.
- Simulating the transmission of 7 × 15 Gbaud 16-quadrature amplitude modulation (16QAM) Nyquist-spaced wavelength-division multiplexing (WDM) polarization-division multiplexing (PDM) signals.
Main Results:
- Achieved a 3% in-span signal power asymmetry over a 62 km single-mode fiber (SMF) link.
- Demonstrated the influence of this asymmetry on system performance with mid-link OPC.
Conclusions:
- Numerical optimization of in-span signal power asymmetry is feasible and effective.
- The achieved asymmetry impacts the performance of WDM-PDM systems with mid-link OPC, requiring careful consideration in system design.
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