There are several wavelength conversion proposal methods out of which this project emphasis “Highly efficient wavelength converter using direct bonded PPZnLN ridge waveguide”. These are highly recommended owing to factors like large signal bandwidth, high conversion efficiency, etc.
There is an ever increasing demand to extend the communication capacity. For this purpose optical networks in the coming future will expand WDM (wavelength division multiplexing) technology to exploit the large bandwidth of the fiber. Large WDM networks will pave the way for construction of flexible networks. These WDM networks need wavelength converters in order to have signal path routing.
In this project, direct-bonded wavelength converters which are ridge-shaped in structure is created by employing ultra-precision machinery fitted with a diamond blade. This waveguide exhibits strong opposition to photorefractive damage as there ion-exchange process is excluded from its fabrication process which further ensures no degradation to its non-linear coefficient. It operates both in the TM as well as TE modes. This characteristic makes polarization diversity realizable and delivers high conversion efficiency. this is a primary requisite in telecommunication applications. Also, this fabricated waveguide allows the propagation of 1560 nm light (travelling in single-mode).
Therefore in this project Highly efficient wavelength converter using direct bonded PPZnLN ridge waveguide fabrication of a 50-mm-long PPZnLN ridge waveguide was achieved by utilizing direct bonding and methods of dry etching. Examination of device characteristics revealed that a SHG efficiency of 2400%/W accompanied by an SHG output power of 148 mW was obtained.
Here a QPM-LN fiber-coupled module with the PPZnLN ridge waveguide was fabricated with 4 dB insertion loss. Wavelength conversion founded on SHG/DFG cascading scheme (1.55 µ m band) was successfully established. This wavelength converter using the highly efficient PPZnLN waveguide would prove very useful in making a photonic network in the future.
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