Summary
International Symposium on Extremely Advanced Transmission Technologies
2019
Session Number:P
Session:
Number:P-05
Experimental Demonstration of Wavelength Path Relocation Using Semiconductor Optical Amplifier Unit in AWG-STAR with Loop-back Function
Yuki OGURA, Osanori KOYAMA, Minoru YAMAGUCHI, Yudai TOMIOKA, Seiya ASO, Kazuya OTA, Kanami IKEDA, Makoto YAMADA,
pp.-
Publication Date:2019/5/29
Online ISSN:2188-5079
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Summary:
"We have proposed Ethernet-based optical fiber networks using a cyclic arrayed waveguide grating (AWG) and inexpensive optical switches for relatively small-scale networks such as networks for data-center, campus and business building [1]. The superior point of the proposed network is that the wavelength path topology can be changed according to the traffic demand by changing the internal connection state of the 2?~2 optical switch in each node, as shown in Fig. 1. The schematic of the proposed network is shown in Fig. 2. The optical switch has two internal connection states (CPT or CLB). In the case of CPT, the wavelength reaches a node. On the other hand, in the case of CLB, the wavelength is looped-back to the AWG and consequently reaches a different node. This is the mechanism of wavelength path relocation, as described in Ref. [1]. However, when the number of loop-backs is large, optical losses are accumulated, which is a limitation of wavelength path relocation. Therefore, to improve the function of the relocation, a semiconductor optical amplifier (SOA) unit has been introduced into the proposed network [2]. In this paper, as an example of wavelength path relocation, a case where a wavelength is looped-back four times on an experimental network we constructed is shown. Figure 3 shows a schematic of the experimental network actually constructed in our laboratory. A wavelength path at 1470 nm (without loop-back) and a wavelength path at 1550 nm (with loop-back at nodes 6, 3, 8 and 5) were provided between nodes 1 and 2. The SOA-unit was installed in node 3. The optical power of wavelength at 1550 nm output from node 1 was measured at a plurality of points in the experimental network, and the results are shown in Fig. 4. Without optical amplification, the received power was below the minimum allowable light power of the optical transceiver, and as a result, a wavelength path at 1550 nm between the nodes was not established. When the optical amplification was ~9.6 dB, it was confirmed that the received power exceeded the minimum allowable light power, and the wavelength path was successfully established. The result indicates that the wavelength path relocation function has been improved by the optical amplification of the SOA-unit."