대한전자공학회논문지SD (Journal of the Institute of Electronics Engineers of Korea SD)

대한전자공학회 (The Institute of Electronics and Information Engineers)
권호 표지

주파수 천이를 이용한 광무선 시스템에서 EOM의 바이어스 방식에 따른 광링크 성능 분석

Optic Link Performances on EOM′s Biasing in Fiber-radio System

  • 발행 : 2001.02.01
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초록

본 논문은 주파수 천이를 적용시킨 광무선(fiber-radio)시스템의 광링크부에 대한 성능분석을 한다. 제시된 광링크부는 CS(control station)에서 얻어진 밀리미터파 대역 광파일럿톤(optical pilot tone)이 하향링크뿐 아니라 상향링크에도 공급되도록 하여 BS(base station)의 구조를 간단히 하였다. 광파일럿톤을 얻기 위해 CS의 EOM(electro-optic modulator)을 MAB(maximum bias), MIB(minimum bias), QB(quadrature bias)로 바이어스를 달리할 수 있으며 각각의 경우에 따라 링크의 성능을 분석한다. 분석은 레이저 광원의 전력이 일정한 경우와 PD(photo detector)에 수신되는 광 DC 전력이 일정한 경우에 대해서 행하여지며 각 경우에 대해서 최적의 하향링크 CNR 및 상향링크 SFDR(spurious free dynamic range)을 얻기 위해 효과적인 바이어스 방식을 제시한다

This paper evaluates the performance of an optic link in a frequency conversion based fiber-radio system. The proposed link structure simplifies a BS(base station) via making the MMW(millimeter wave) optical pilot tone generated in the CS(control station) be used in the uplink as well as in the downlink. To acquire the optical pilot tone, an EOM(electro-optic modulator) in the CS is biased in three different ways, i.e., MAB(maximum bias), MIB(minimum bias), QB(quadrature bias). We, depending on the biasing of the EOM, evaluate the link performances in two cases; one is for constant laser source power and the other for constant received DC optical power at a PD(photo detector). Based on the simulation results on the downlink CNR and the uplink SFDR(spurious free dynamic range), we finally deduce the effective EOM biasing for each case.

키워드

참고문헌

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