提升混合式光纖-微波分波多工傳輸系統效能

Improvement of a Radio-on-Hybrid WDM Transport System Performance

陳雅玲(Ya-Lin Chen)

指導教授 ： 曾世杰 ； 呂海涵

國立臺北科技大學/機電學院/光電工程系所/碩士(2005年)

https://doi.org/10.6841/NTUT.2005.00217

摘要

在本論文中，我們提出幾種可改善光纖有線電視/光纖-微波傳輸系統性能的方式。
首先，我們提出並證實一建構在分波多工及光塞取多工技術技術上的全雙工光纖-微波傳輸系統，並在接收端使用光纖布拉格光柵與光循環器結合的光單旁波帶/殘旁波帶濾波器來改善整個系統的性能。第二，我們以直接調變的方式來同時傳送有線電視和微波訊號，並利用外部光注入以及在接收端使用光單旁波帶濾波器兩種技術來改善傳輸系統的性能。訊號經80公里單模光纖傳輸後，有線電視訊號仍能得到好的載波雜訊比、載波合成二次拍差比及載波合成三次拍差比；在光纖-微波的應用中也達到低的誤碼率值。第三，我們提出一個使用DFB雷射二極體以及半導體光放大器為基礎的混合式光纖-微波分波多工傳輸系統，利用雙級外部光源注入技術來增加雷射頻率響應及提升半導體光放大器的飽和輸出功率。經100公里單模光纖傳輸後，系統能得到好的誤碼率、調變誤差比、載波雜訊比、誤差向量數值和三階互調失真載波比值。

關鍵字

光纖-微波 ； 混合式光纖-微波分波多工 ； 外部光源注入技術 ； 光單旁波帶濾波器 ； 半導體光放大器

並列摘要

In this paper, we propose several methods to improve fiber optical CATV/radio-on-fiber (ROF) transport systems performances.
First, We proposed and demonstrated a full-duplex ROF transport system based on wavelength-division-multiplexing (WDM) and optical add-drop multiplexing techniques (OADM), as well as employed fiber Bragg grating (FBG) in combination with optical circulator (OC) as the optical single sideband (SSB)/vestigial sideband (VSB) filter at the receiving site to improve system performance. Second, a directly modulated lightwave transport system based on external light injection technique and optical SSB filter at the receiving site is proposed and demonstrated, simultaneous transmission of CATV and microwave signals. Over an 80 km SMF transport, good performances of carrier-to-noise ratio (CNR), composite second order (CSO) and composite triple beat (CTB) were obtained for CATV signals; as well as low bit error rate (BER) value was achieved for ROF applications. Third, a radio-on-hybrid WDM transport system based on distributed feedback laser diodes (DFB LDs) and semiconductor optical amplifiers (SOAs) with double external light injection techniques is proposed and demonstrated. The double external light injection techniques increases laser’s frequency response and SOA’s output saturation power, respectively. Over an 100 km SMF transport, good performances of BER, modulation error ratio (MER), CNR, error vector magnitude (EVM) and third order intermodulation distortion to carrier ratio (IMD3/C) were achieved in our proposed systems.

並列關鍵字

radio-on-fiber ； radio-on-hybrid WDM ； external light injection technique ； optical single sideband filter ； semiconductor optical amplifier

參考文獻

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