Based on FP LDs with split band technique in two-channel fiber optical CATV transport system

Wen-Shing Tsai,Hong-Yu Dai,Chung-Yi Li,Gow-Yi Tzou

doi:10.1051/matecconf/201818500015

Wen-Shing Tsai, Hong-Yu Dai + Show 2 more

Open Access

https://doi.org/10.1051/matecconf/201818500015

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Abstract

This study proposes a two-channel fiber optic cable television (CATV) transport system based on Fabry–Perot laser diodes (FP-LDs) with a split band technique. To reduce the interference between channels, we apply the split band technique to two channels with different frequencies by using two converters at each moment. In this two-channel transmission scheme, composite second-order (CSO) and composite triple-beat (CTB) distortions induced by the systems are possibly confined in unused channels and result in good transmission performances. Through a 40 km standard single-mode fiber transmission, excellent performances of carrier-to-noise ratio (≥50 dB), CSO (≥70 dB), and CTB (≥72 dB) are obtained using the proposed fiber optic CATV transport systems. The proposed systems employing FP-LDs with a split band technique are also simpler and more cost effective than conventional externally modulated systems.

Highlights

For fiber optical cable television (CATV) transport systems, the maximum fiber link using cascaded erbium-doped fiber amplifiers (EDFAs) is limited by RF parameters such as carrier to noise ratio (CNR), composite second-order (CSO), and composite triple beat (CTB) [1, 2]
A structure of directly modulated fiber optical CATV transport system based on Fabry-Perot laser diodes (FP LDs) with split band technique is proposed and experimentally demonstrated
It can be seen that the CNR value of system II is lower than that of system I about 3 dB

Summary

Introduction

For fiber optical CATV transport systems, the maximum fiber link using cascaded erbium-doped fiber amplifiers (EDFAs) is limited by RF parameters such as carrier to noise ratio (CNR), composite second-order (CSO), and composite triple beat (CTB) [1, 2]. A structure of directly modulated fiber optical CATV transport system based on Fabry-Perot laser diodes (FP LDs) with split band technique is proposed and experimentally demonstrated. To compare with a conventional externally modulated fiber optical CATV system, the proposed system reveals a prominent merit with simpler and more economic advantages

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Results

Conclusion