Study On Gain-Clamped Wavelength Converter

With the development of triple play service, passive optical network (PON), as a key technology to optical access network, tends to be long-reach access and large area covering to reduce the end-to-end cost of bandwidth and simplify the network. Current TDM-PON (Ethernet-PON and Gigabit-PON) architectures are economically feasible, but inevitably sacrifice per-subscriber bandwidth by sharing a single wavelength channel with multiple subscribers. WDM-PON offers great security and protocol transparency, and accommodates more subscribers without sacrificing bandwidth by adding wavelength channels, but the components in it are relatively expensive. A novel hybrid WDM/TDM passive optical network (HPON) based on all-optical wavelength conversion (AOWC) with high capacity and long reach and a single-fiber transmission is proposed. In AOWC-HPON architecture, wavelength conversion is a key technology to combine TDM and WDM.In this article, a novel gain-clamped wavelength converter (GCWC) is proposed to make the AOWC-HPON architecture feasible. Several theoretical and experimental investigations on GCWC have been carried out as follows:Chapter two makes further study into theoretical bases on GCWC. The static and dynamic model of GCWC, which are used to simulate the wavelength conversion, is established.In chapter three, several properties of wavelength conversion based on GCWC, such as input-output characteristic, output extinction ratio, frequency response characteristic, chirp characteristic and overshoot characteristic, are numerically simulated and studied theoretically. The results provide detail gist for parameters optimization.Four GCWC with different clamped wavelength are made and a complete experiments of wavelength conversion based on these four GCWC of optimization parameters was performed. The experimental results agree well with the theoretical calculation. All the GCWC are better to meet the needs of HPON, for the GCWC achieved wavelength conversion on the burst mode signals whose power D-value is 9 dB, with the interval of 50 nm.Performance of HPON system based on GCWC is tested. The results show that GCWC ensure the HPON architecture feasible, and extend the power budget of the HPON. In addition, GCWC makes burst signals from different transmitters with up to 5 dB dynamic range equalized and is transparency for burst signals.