Complementary bipolar spectral polarization coding over fiber-grating-based differential photodetectors
Complementary bipolar spectral polarization coding over fiber-grating-based differential photodetectors
复制标题
基于光纤光栅的差分光电探测器的互补双极光谱偏振编码
DOI：
10.1117/1.2188416
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
Jen
中科院分区：
文献类型：
--
作者：
Yao;Jen
本研究提出了一种光谱偏振编码方案，用于在非相干光码分多址网络中实现互补双极光相关。编码器-解码器是通过基于光纤布拉格光栅和偏振分束器的差分光电探测器实现的。传统上，互补单极性频谱幅度编码SAC方案用于传输数据位1上的特定码字及其数据位0上的互补码字。在所提出的方案中，频谱幅度与偏振编码结合作为特定签名地址码。采用 Walsh-Hadamard 码作为签名地址，将每个指定波长分配给单独的垂直或水平偏振状态。结果表明，理论上可以通过差分光电探测器的相关减法来消除多址干扰。忽略散粒噪声和热噪声的影响，并仅考虑理想情况下偏振度设置为 P=0 的相位引起的强度噪声，与互补单极性 SAC 方案相比，所提出的方案的误码率 BER 与同时活动用户数量的关系提高了 43%，误码概率为 10 9。在最坏情况下设置 P=1，所提出方案的 BER 性能与互补单极 SAC 方案的 BER 性能相匹配。 © 2006 光电仪器学会
This study proposes a spectral polarization coding scheme for the implementation of complementary bipolar optical correlation in a noncoherent optical code-division multiple-access network. The coder- decoders are implemented over differential photodetectors based on fi- ber Bragg gratings and polarization beamsplitters. Traditionally, comple- mentary unipolar spectral amplitude coding SAC schemes are used to transmit the specific codeword on data bit 1 and its complementary codeword on data bit 0. In the proposed scheme, the spectral amplitude is incorporated with polarization coding as the specific signature address code. A Walsh-Hadamard code is employed as the signature address to allocate to each specified wavelength to an individual vertical or horizon- tal state of polarization. The results indicate that multiple-access interfer- ence can theoretically be eliminated by correlation subtraction at the differential photodetectors. Neglecting the effects of shot noise and ther- mal noise, and considering only phase-induced intensity noise with a degree-of-polarization setting of P=0 for the ideal case, the bit error rate BER versus the number of simultaneous active users is improved by 43% in the proposed scheme over the complementary unipolar SAC scheme for a 10 9 error probability. Setting P=1 for the worst case, the BER performance of the proposed scheme matches that of the comple- mentary unipolar SAC scheme. © 2006 Society of Photo-Optical Instrumentation