Yang Yi, Foster Mark, Khurgin Jacob B, Cooper A Brinton
Department of Electrical and Computer Engineering, The Johns Hopkins University 3400 N. Charles St, Barton 105, Baltimore, Maryland 21218, USA.
Opt Express. 2012 Jul 30;20(16):17600-9. doi: 10.1364/OE.20.017600.
A novel coherent optical code-division multiple access (OCDMA) scheme is proposed that uses spectral line pairing to generate signals suitable for heterodyne decoding. Both signal and local reference are transmitted via a single optical fiber and a simple balanced receiver performs sourceless heterodyne detection, canceling speckle noise and multiple-access interference (MAI). To validate the idea, a 16 user fully loaded phase encoded system is simulated. Effects of fiber dispersion on system performance are studied as well. Both second and third order dispersion management is achieved by using a spectral phase encoder to adjust phase shifts of spectral components at the optical network unit (ONU).
提出了一种新颖的相干光码分多址（OCDMA）方案，该方案利用谱线配对来生成适合外差解码的信号。信号和本地参考信号均通过单根光纤传输，并且一个简单的平衡接收机执行无源外差检测，消除散斑噪声和多址干扰（MAI）。为了验证该想法，对一个16用户全负荷相位编码系统进行了仿真。还研究了光纤色散对系统性能的影响。通过使用频谱相位编码器来调整光网络单元（ONU）处频谱分量的相移，实现了二阶和三阶色散管理。
