We investigate the utilization of semiconductor optical amplifiers (SOAs) and quantum-dot laser-based Raman amplifiers in high-capacity dense wavelength division multiplexed (DWDM) 1310-nm transmission systems. Performed simulations showed that in a 10×40 Gbit/s system, the utilization of a single Raman amplifier in a back-propagation scheme can extend the maximum error-free (bit error rate <10−9) transmission distance by approximately 25 km in comparison with the same system utilizing only an SOA used as a preamplifier. We successfully applied a Raman amplifier in an 8×2×40 Gbit/s 1310-nm polarization multiplexed (PolMux) DWDM transmission over 25 km. Conducted experiments showed that the utilization of a Raman amplifier in this system leads to 4-dB improvement of the average channel sensitivity in comparison to the same system utilizing SOAs. This sensitivity improvement can be translated into a higher power budget. Moreover, lower input optical power in a system utilizing a Raman amplifier reduces the four-wave mixing interactions. The obtained results prove that Raman amplification can be successfully applied in 1310-nm high-capacity transmission systems, e.g., to extend the reach of 400G and 1T Ethernet systems.
The utilization of multiple wavelength domains in one transmission system has become a significant trend in modern opto-telecommunications due to the growing demand for transmission capacity. To realize parallel 1550/1310 nm transmission, new 1310 nm amplification techniques are needed, such as the 1310 nm Raman amplifier. In the paper, we investigate the performance of three different configurations of the 1310 nm QD laser based Raman amplifier. In the polarization multiplexed co-propagating configuration we obtained a gain of 9 dB, while it was reduced to 8 dB in the bi-directional configuration. The highest gain was achieved in the polarization multiplexed counter-propagating configuration, with a gain of over 16 dB. The presented results open the way for the optimization of the 1310 nm Raman amplifier’s architecture and the enhanced utilization of Raman amplifiers in telecommunication systems.
This paper has been withdrawn. The following nearly identical paper is available in this conference proceedings: Jarosław Piotr Turkiewicz and Paweł Czyżak, "The high gain 1310nm Raman amplifier," Proc. SPIE 9228, Optical Fibers and Their Applications 2014, 92280P (May 12, 2014); doi:10.1117/12.2067055.
Due to the growing demand for transmission capacity, it has become essential to utilize multiple wavelength domains in one transmission system. To take full advantage of parallel 1550/1310 nm transmission, efficient 1310 nm amplification techniques are needed, such as the 1310 nm Raman amplifier. In the paper, we present detailed studies regarding the design of the 1310 nm Raman amplifier. Based on numerical simulations, we propose an efficient 1310 nm Raman amplifier design, utilizing the 1240 nm quantum-dot pumping lasers. The designed Raman amplifier is built and characterized. The achieved gain in a QD-laser pumped 1310 nm Raman amplifier was 19.5 dB. The presented results open the way for enhanced utilization of the 1310 nm Raman amplifier in the opto-telecommunication systems.
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