Optical design of 4-channel TOSA/ROSA for CWDM applications

Abstract

Abstract In this paper, the optical design of 4-channel WDM Transmission Optical Subassemblies (TOSA)/ Receiver Optical Subassemblies (ROSA) is reported. The TOSA and ROSA are being developed for uncooled modules for CWDM applications and are compatible with the SFP/SFF form factor TOSA and ROSA. The physical dimension of OSA together with the electronic ci rcuitries is limited to 10x6x5 mm 3 . The designs of TOSA and ROSA are employed using four thin film filters (TFFs) to select the specific channel wavelength, four 500µm ball lenses, one 2.5 mm ball lens and a high reflection mirror using folded opti cal configuration. The opti cal elements are to be assembled on a SiOB, except the 2.5 mm ball lens. The simulation results are used to esti mate the required optical co mponents assembly accuracy. Based on the simulation results, the tolerance requirement for tilting the mirror and first thin film filter is approximately ± 0.2 0 for the longest optical path namely Channel 4. Keywords: Optical design, optical subassemblies, TOSA/ ROSA, silicon optical bench