Abstract
Wavelength-division multiplexing (WDM) offers a simple method for increasing information capacity. Integrated optical WDM devices are advantageous because of the ease of fabrication and the potential for combining several devices on the same chip. Implementing WDMs on an electro-optic LiNbO3 substrate provides the flexibility for voltage tuning the channels to match available laser sources. A dual-channel WDM based on the two-mode-interference (TMI) waveguide structure has already been demonstrated.1 A two-stage, four-channel WDM based on the TMI concept has previously been proposed and analyzed.2 In this paper we report the first demonstration of such a four-channel WDM for 1.3-µm wavelength operation. The device is illustrated in Fig. 1. It consists of three dual-channel TMI WDMs that are cascaded in two stages. The long TMI section (L3) is twice as long as the short TMI sections (L1 and L2).
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