FABRICATION OF MULTI-WAVELENGTHLIGHT SOURCES

多波长光源是未来大规模波分复用（WDM）网络的关键器件之一。各种各样的多波长光源已经被提出并证明。利用宽带光源，如发光二极管、超发光二极管（SLDs）、超连续谱发生器和锁模半导体激光器进行光谱切片技术，尤其对于产生等间隔多波长光具有吸引力。使用非相干光的光谱切片光源结构简单，但缺点是低功率有限，并且由于自发发射热噪声而产生较大的过量强度噪声。本文介绍了大功率锥形sld的建模和实验。高功率的锥形单晶硅光器件已经被开发出来，并且可以在非均匀量子阱结构下实现宽带发射。此外，本文还提出了一种新的降低超强噪声的方法。研究了一种具有非均匀量子波结构的锥形单晶硅光器件，用于大规模光谱切片多波长光源。在1.5μm和1.2μm波段均获得了超过1.5 W的高功率和超过50 nm的宽带发射。此外，我们还提出了一种利用饱和soa消除非相干光的热噪声的新方法。我们发现半导体光放大器的饱和特性有助于降低光谱切片光的过量强度噪声。我们研究了使用增益饱和SOA的噪声抑制，结果表明，在几GHz的带宽内，输入信号的噪声强度可以显著降低。我们演示了一个具有降噪和信号调制功能的SOA强度调制器。该器件可用于波分复用局域网络中的频谱切片多波长光源。

A multi-wavelength light source is one of key devices for future large scale wavelength division multiplexing (WDM) networks. Various kinds of multi-wavelength light sources have been proposed and demonstrated. A spectrum slicing technique using broadband light sources, such as light emitting diodes, super-luminescent diodes (SLDs), super-continuum generators and mode-locked semiconductor lasers, is attractive especially for generating equally-spaced multi-wavelength light. The configuration of spectrum sliced light sources using incoherent light is simple, however, the drawback is a limited low power and a large excess intensity noise caused by a spontaneous emission beat noise.In this work, modeling and experiments on high power tapered SLDs were presented. High power tapered SLDs have been developed and broad-band emission can be realized with non-uniform quantum well structures. Also, a novel technique of reducing the excess intensity noise has been developed.A tapered SLDs with the non-uniform QW structure was demonstrated for large scale spectrum sliced multi-wavelength light sources. High power of over 1.5 W and broad-band emission of over 50 nm were demonstrated either at 1.5μm and 1.2μm band. Also, we propose a novel method to avoid the beat noise of spectrum-sliced incoherent light by using saturated SOAs. We found that the saturation characteristic in semiconductor optical amplifiers is helpful for reducing the excess intensity noise of spectrum-sliced light. We investigated the noise suppression using a gain-saturated SOA, showing that the intensity noise of the input signal can be significantly reduced over a bandwidth of few GHz. We demonstrated a SOA intensity modulator with a function of both noise reduction and signal modulation. The proposed device will be useful for spectrum-sliced multi-wavelength light sources used in WDM local area networks.