We demonstrate the simple relationship between the refractive index modulation, the chirp coefficient and the
reflectivity of the large chirped Bragg grating. When applying it to design the gain flattened filter, we can get almost the
same profile as the custom requests. At last, we propose the procedure using this method to write the gratings.
Numerical results show that only apodization compensation is necessary for apodized binary sampled Bragg grating, while sampling compensation is not necessary. A novel apodization compensation preconditioning approach is proposed. This process doesn't require the removal ofthe phase mask. We fabricate a 5 channels sampled Bragg grating with 0.25nm's bandwidth and —980ps/nm's dispersion. Dispersion compensation using the fabricated grating for standard single mode fiber 10Gb/s-80km transmission is demonstraded.
A new instrument to measure stokes vectors using an electro-drived polarization controller and a polarizer based on "TDM" is demonstrated. Using this instrument as well as data fitting and interleaving technique higher-order PMD is detailed.
Surface micromachining processes based on III-V compound semiconductors are presented in this paper, in order to develop Micro-Opto-Electro-Mechanical systems (MOEMS). By fabricating micro cantilevers composed of seven InP/Air gap pairs, the major techniques of the surface micromachining are studied, including non-selective and selective etching, rinsing and drying. A severe problem of the sticking phenomena during rinsing and drying is avoided by the implementation of the Critical Point Drying (CPD) method.
A novel dispersion slope compensation by applying a strain gradient on a grating has been proposed. The strain gradient can produce both chirp in the grating period and chirp in the sampling period, which can be used to compensate for fiber dispersion and dispersion slope simultaneously in WDM system.