Optical add/drop multiplexers (OADMs) are finding their applications in future all-optical communication networks to link the network with local transmitters and receivers. A novel fully dynamic and reconfigurable OADM based on AOTF with low crosstalk is presented. The PMD compensation issue of AOTF is addressed as well.

The Integrated acousto-optic tunable filter have the potential to perform the OADM or OXC functions, which play significant role in WDM optical network. The characteristic of the acousto-optic mode conversion is sinc2-like functions with high sidelobe intrinsic. The high sidelobe level lead to serious crosstalk in the WDM optical network. The theory of weighted coupling for IAOTF has been presented. And the filter response using four suggested weighted functions has been calculated with the matrix methods. Significant suppression of sidelobe level has been achieved by employing the techniques of weighted coupling. It is a valid approach to reduce the sidelobe of IAOTF by chosing propriety weighted function and a realized way.

A novel optical analog-to-digital converter based on optical time division multiplexing (OTDM) is described which uses electrooptic sampling and time-demultiplexing together with multiple electronic analog-to-digital converter(ADC). Compared with the previous scheme, the time-division multiplexer and the time-division demultiplexer are applied in the optical analog-to-digital converter (OADC) at the same time, the design of the OADC is simplified and the performance of the OADC based on time-division demultiplexer is improved. A core optical part of the system is demonstrated with a sample rate of 10 Gs/s. The signals in three channels are demultiplexed from the optical pulses.The result proves our scheme is feasible.

本文以TeO2 声光可调谐滤波器（AOTF）的工作原理为基础，根据光通信中光插分复用器件的性能要求，利用MATLAB计算软件，从动量匹配、晶体旋光性、器件带宽和共线状况四个方面对其光和声的入射角选择进行了分析，得到结论为：在两入射角满足动量匹配的基本前提下，考虑晶体旋光性时，光入射角最好工作在40-250和600-900的范围内；考虑器件线宽时，若使其小于1nm，光入射角在400nm的通频带内应大于310，否则调谐范围将有所下降，此外对光通信TeO2器件选择非共线工作是必要的。