20-GHz optical analog link using an external modulator

G. Betts, C. Cox, K. Ray
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引用次数: 8

Abstract

An optical analog link operating at 20 GHz with a 3-dB bandwidth of 5.2 GHz was demonstrated. This link has an intermodulation-free dynamic range of 108 dB-Hz/sup 2/3/ and a maximum signal-to-noise ratio (SNR) of 155 dB-Hz. Previously reported direct modulation analog links have not been able to operate at 20 GHz and, even in the 10-GHz frequency range, have had 20-30-dB-poorer SNRs; externally modulated links are capable of high-frequency operation but have demonstrated 30-50-dB-poorer SNRs than the present link. The link consists of a CW laser, an integrated-optical intensity modulator, and a p-i-n diode detector connected by fibers; it contains no amplifiers. The link performance is evaluated at the RF ports, i.e. it is treated as a two-port RF device. It is noted that by simply using a detector with no rolloff and by reducing the modulator excess optical insertion loss to 3 dB, the RF insertion loss can be improved to -25 dB and the noise figure to 33 dB.<>
使用外部调制器的20ghz光模拟链路
演示了一种工作在20ghz、3db带宽为5.2 GHz的光模拟链路。该链路的无互调动态范围为108 dB-Hz/sup 2/3/,最大信噪比(SNR)为155 dB-Hz。先前报道的直接调制模拟链路无法在20ghz下工作,即使在10ghz频率范围内,信噪比也会降低20- 30db;外部调制链路能够进行高频操作,但已证明比现有链路的信噪比低30-50 db。该链路由连续波激光器、集成光强度调制器和光纤连接的p-i-n二极管探测器组成;它不包含放大器。链路性能在射频端口进行评估,即它被视为双端口射频设备。值得注意的是,通过简单地使用无滚降的检测器并将调制器过量的光插入损耗降低到3 dB,射频插入损耗可以提高到-25 dB,噪声系数可以提高到33 dB.>
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