雙向光纖有線電視/光纖微波傳輸系統

Two-way lightwave CATV/ROF transport systems

林義平(Ying-Pyng Lin)

指導教授 ： 呂海涵

國立臺北科技大學/電資學院/光電工程系研究所/博士(2014年)

摘要

光纖有線電視(CATV)、光纖微波(ROF)、光纖到家(FTTH)、以及多頻服務傳輸系統乃是具有發展及應用潛力的通訊系統，在目前處於積極推動傳輸骨幹光纖化的光世代，全面使用光纖進行系統傳輸將是勢在必行，相信在不久的將來將會掀起一股光世代的風潮。
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直調CATV訊號和相位調變微波光纖（ROF）信號此兩種不同的信號調變格式系統和使用IM重新調變的ROF訊號的雙向傳輸系統，並在接收端使用交織器(interleaver)與光循環器結合的光帶通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，並利用光注入/光電反饋技術以及在接收端使用PCF系統和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，我們提出一個使用直調CATV訊號和使用PM重新調變的ROF訊號的雙向傳輸系統，且上行光纖訊號先被摻鉺光纖放大器(EDFA)放大，然後經過10GHz FSR的延遲干涉儀(DI)來轉換相位調變訊號成強度調變訊號,系統能得到好的誤碼率、載波雜訊比、載波合成二次拍差比及載波合成三次拍差比。第四，我們提出一個使用PM調變CATV訊號和使用PM調變的ROF訊號的傳輸系統, 及在接收端使用PCF和光纖光柵濾波器兩種技術來改善傳輸系統的性能。訊號經 41.3 公里單模光纖和光子晶體光纖傳輸後，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-微波的應用中也達成低的誤碼率值。第五,將塑膠光纖/微波傳輸系統利用微波頻帶次載波多工的技術以塑膠光纖來傳送無線訊號，藉以結合無線微波通訊及光通訊之優點。

關鍵字

光纖有線電視傳輸系統 ； 光纖微波 ； 多頻服務 ； 相位調變技術

並列摘要

CATV, ROF, FTTH and multi-band transmissions system is a communication system with development and application potential. In the current era where optical communication that actively promotes transmissions backbone using fiber optics, the change to using fiber optics as transmissions system in all aspects is a must. We believe that this will become the trend in the near future.
In this dissertation, we propose several methods to improve fiber optical CATV/radio-on-fiber (ROF) transport systems performances. First, we proposed and demonstrated a two-way lightwave subcarrier transmission system employing interleavers to deliver intensity-modulated CATV/phase-modulated ROF/intensity-remodulated 16-QAM-OFDM signals over two 20-km SMFs links. To the best of our knowledge, it is the first time to employ interleavers in two-way lightwave subcarrier transmission systems. The downstream light is successfully intensity-remodulated with 16-QAM-OFDM signal for up-link transmission. Brilliant performances of CNR/CSO/CTB/BER are obtained for CATV/ROF/16-QAM-OFDM signals transmissions. Our proposed systems present impressive performances features in delivering hybrid CATV/ROF/16-QAM-OFDM signals. Second, a hybrid lightwave subcarrier CATV/16-QAM/16-QAM orthogonal frequency-division multiplexing (OFDM) transmission system employing light injection/optoelectronic feedback techniques and photonic crystal fiber (PCF) is proposed and demonstrated. Good performance of carrier-to-noise ratio (CNR), composite second order, and composite triple beat were obtained for the CATV band, and high CNR and low bit error rate values were achieved for the 16-QAM and 16-QAM OFDM bands over a combination of 80 km single-mode fiber (SMF) and 2.86 km PCF transport. Third, a bidirectional lightwave transport system employing direct modulation CATV and phase remodulation radio-over-fiber (ROF) signals in two-way transmission is proposed and experimentally demonstrated. To be the first system of reusing the phase of the transmitting lightwave with multi-carrier analog CATV signal, the transmission performances of CATV and ROF signals are investigated in bidirectional way, with the help of optical band-pass filters (OBPFs) at the receiving sites. Through a serious investigation, the transmitting light sources are successfully remodulated with RF signals for transmission. Brilliant transmission performances of composite second-order (CSO), composite triple-beat (CTB), and bit error rate (BER) were obtained; accompanied with acceptable carrier-to-noise ratio (CNR) value. This proposed system reveals a prominent one with economy and convenience to be installed. Fourth, a bidirectional phase-modulated hybrid cable television/radio-over-fiber lightwave transport system employing fiber Bragg grating tilt filter as a phase modulation-to-intensity modulation conversion scheme is proposed and demonstrated. Impressive performances of carrier-to-noise ratio, composite second-order, composite triple-beat, and bit-error rate are obtained in our proposed systems over a combination of 40 km single-mode fiber-and 1.43 km photonic crystal fiber transmission. Fifth, an in-building network based on cable television (CATV) integration with quadraturephase-shift keying (QPSK) orthogonal frequency-division multiplexing (OFDM) transport over a combination of single-mode fibers (SMF) and perfluorinated graded-index plasticoptical fibers (GI-POF) is proposed and experimentally demonstrated.

並列關鍵字

CATV Transport System ； Radio over Fiber ； Multi-Band Service ； Phase Modulation Technology

參考文獻

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