RCE MEASUREMENTS IN ROF OF IEEE802.16-2004(WIMAX) WITH STRUCTUALLY OPTIMIZED DFB LASERS
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In the Radio-over-Fiber (RoF) link of Worldwide Interoperability for Microwave Access (WiMAX) of IEEE802.16-2004, three different types of Multi-Quantum-Well (MQW) Distributed Feedback (DFB) Laser Diodes (LDs) are evaluated with Relative Constellation Error (RCE). The RCE is measured using a subcarrier frame of the IEEE802.16-2004. The two types of MQW-DFB-LDs are designed for community antenna television (CATV) applications. Another one is an Electro Absorption Modulation monolithically Integrated (EAMI) MQW-DFB-LD that is designed for 10Gb/s digital applications. The 1550nm and 1310nm MQW-DFB-LDs show similar RCE characteristics in the same test condition. The RCE values are lower than -44dB over the modulation powers between -5 and -20 dBm, and over the optical powers between 3 and 6mW. The EAMI-MQW-DFB-LD shows different RCE values, in comparison with the others. The RCEs lower than 40dB are obtained in a narrow range of the modulation powers between -10 to -15 dBm and the optical powers between 2 and 3.5mW. These results are similar to that of the Error Vector Magnitude (EVM) measurements in the IEEE802.11g (WLAN). Those types of MQW-DFB lasers are suitable for both the CATV and the WiMAX applications, and satisfy both the cost and the low RCE performance.
- 沖縄工業高等専門学校の論文
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