随着宽带接入技术的发展，以太无源光网络是光纤到户的一种备选方案.而光网络单元数量众多，其成本成为限制以太无源光网络技术实施的重要影响因素.本文提出了一种低成本以太无源光网络单元实现方式: 采用带柔性电路板的单纤双向光纤组件直接安装在光网络单元的电路板上.为了验证弯曲柔性电路板的高速性能没有恶化，采用有限元方法仿真了弯曲柔性电路板的小信号响应.由于该方式没有独立的光收发模块，无法采用比特误码分析仪进行测试，因此提出了采用网络测试仪搭建光网络单元的光信号性能测试系统的方案并实现了对光信号的性能测试.结果表明: 对于发射机，在0℃~70℃的范围内得到了超过10 dB的消光比和1 dBm的平均发射功率; 对于接收机，估算灵敏度为-27 dBm.

With the development of broadband access network, Ethernet Passive Optical Network (EPON) becomes a candidate for fiber to the home. As the huge amount of Optical Network Units(ONUs), the deployment of EPON is affected by the cost of ONU. A low cost EPON (ONU using Bi-directional Optical Sub-Assembly (BOSA) with Flexible Printed Circuit (FPC) was proposed. The FPC-BOSA is mounted directly to the ONU board. Small signal response of FPC was simulated by Finite Element Method (FEM), the results prove that the high speed performance do not degrade. However, there is no individual transceiver module in this proposal, so bit error tester can not be used to test the optical performance. Measurement system using network tester was set up. For the transmitter, the extinction ratio over 10 dB and the average optical power over 1 dBm were obtained from 0℃ to 70℃. For the receiver, the estimated sensitivity achieves -27 dBm.