Short-range optical interconnection is more emphasizing in high performance systems. Multimode waveguide array is considered as a major interconnection medium due to the relatively easy packaging with devices. The multimode fiber array conjunction with VCSEL and Pin photodiode array is widely used in board to board and/or system to system interconnection. We demonstrate a flexible optical waveguide film which was composed of VCSEL, photodiode array, multimode waveguide array and 45 degree micro mirror couplers. The flexible waveguide film has many potentials such as it can be integrated with typical rigid electronic board and free from geometrical constraint. The waveguide film with 45° mirror was fabricated on a flexible transparent substrate using soft molding technique and then thin film VCSEL and photo-detector array are integrated. Master structure of the waveguide, which has multimode waveguide array and 45° mirror structure was fabricated using conventional lithography and microtome technique.
A wide bandwidth Mach-Zehnder modulator with on/off switching powers of 20 dBm, a bandwidth of up to 20 GHz, and insertion losses around 5 dB is presented which is based on HCC-1232 polymer. Attention is given to material properties of HCC-1232, the modulator design, and preliminary test results.
Early work at Hoechst Celanese1 demonstrated that methacrylate polymers
with mesogenic side chains could be made with reasonably large electro-optic
activity. The mesogenic side chains are polar so that a non-centrosymmetric
structure can be obtained by heating a film near its Tg in a strong d.c. electric
field and thus orienting the side chains. In Figure 1, the general structure of
methacrylate based electro-optic polymers using polar nitro-stilbene
chromophores is shown.
This paper discusses some of the important material property requirements for polymeric materials in electro-optic device applications, in particular, a detailed materials characterisation of a promising polymer that is not only high in electro-optic activity after poling, but has predicted long term thermal stability of the poled structure. This material is a methacrylic chain polymer with non-linear optical moieties attached as side chains through a spacer group. Progress in fabrication and characterisation of waveguides using this polymer is also reported.