Study on Ultra-Multiplexed Photonic Network Technology with Photonic Crystal

基于波分复用（WDM）技术的超宽带光传输系统及其全光信号处理技术是未来光子网络不可或缺的组成部分。特别是，超宽带波长转换必须发挥重要作用，以发展这样的网络。本论文的目的是利用光子晶体光纤（PCF）和半导体光放大器（SOA）实现超宽带波长转换。首先，我们研究了利用PCF实现的超宽带波长转换。因此，我们已经得出结论，这是非常困难的，以实现超宽带波长转换超过60 nm的波长工作范围，通过使用传统的PCF。为了实现100 nm以上的宽带波长转换，需要具有高非线性系数和低色散的光子晶体光纤 关于我们 提出了一种利用传统SOA实现超宽带波长转换的新技术。所提出的转换器包括多级级联的波长转换器，每个SOA具有不同的增益带。每个级联的波长转换器使我们能够执行非反相（NIV）和反相（IV）操作。转换性能进行比较，在NIV和IV操作的静态特性作为转换器的输入/输出功率的函数。虽然在两种操作下都实现了良好的转换性能，但IV波长转换具有更好的可扩展性，以获得级联方案的高质量转换信号。此外，通过重复IV波长转换来证明信号幅度再生。最后，我们首次成功地实现了超宽带波长转换，包括利用三级级联波长转换器将300 nm以上的波长跳到短波长侧，这些结果表明我们提出的技术将有助于提高未来超宽带光子网络的灵活性。少

Ultra-wideband optical transmission systems based on wavelength-division-multiplexing (WDM) and its all-optical signal processing techniques are indispensable for future photonic networks. In particular, ultra-wideband wavelength conversion must play an important role to develop such networks. The purpose of this work is to realize ultra-wideband wavelength conversion by utilizing photonic crystal fiber (PCF) and semiconductor optical amplifier (SOA).First, we have studied an ultra-wideband wavelength conversion using PCF We have investigated the wavelength conversion characteristics of the conventional PCF theoretically and experimentally. As a result, we have concluded that it is very difficult to realize an ultra-wideband wavelength conversion with over 60 nm wavelength operating range by using the conventional PCF. To realize over 100 nm wideband wavelength conversion, special PCF with higher nonlinear coefficient and lower chromatic dispersion will be required.Next, we have studie … More d SOA-based wavelength conversion, and proposed a novel technique to realize ultra-wideband wavelength conversion using conventional SOAs. The proposed converter consists of multistage cascaded wavelength converters using SOAs each with different gain band. Each of the cascaded wavelength converters enables us to perform both noninverted (NIV) and inverted (IV) operations. Conversion performance is compared at NIV and IV operations in terms of static characteristics as a function of input/output power of the converter. While good conversion performances are achieved at both operations, the IV wavelength conversion has better cascadability to obtain a high-quality converted signal for the cascaded scheme. Moreover, signal amplitude regeneration is demonstrated by repeating the IV wavelength conversion. Finally, we successfully demonstrate, for the first time, ultra-wideband wavelength conversion, including over 300 nm wavelength hopping to the shorter wavelength side with a triple-stage cascaded wavelength converter.These results indicate that our proposed technique will be useful in improving the flexibility of future ultra-wideband photonic networks. Less