Abstract
Two reconfigurable optical add-drop multiplexers, operating in the second or third telecom window, as well as a 1x4x4 reconfigurable lambda-router operating in the second telecom window, are demonstrated. The devices have a footprint less than 2 mm(2) and are based on thermally tunable vertically coupled microring resonators fabricated in Si(3)N(4)/SiO(2).
Highlights
The application of optical fibers has led to virtually loss-less point to point data links in the core network with practically unlimited bandwidth
The reconfigurable Optical Add Drop Multiplexer (rOADM) consists of a central bus waveguide which is coupled to four Microring Resonators (MRs)
The input and output of the central bus waveguide are positioned on the same side as the drop ports. This gives the option to use the device as either a reconfigurable de-multiplexer when attached to one- or as an rOADM when attached to two fiber arrays
Summary
The application of optical fibers has led to virtually loss-less point to point data links in the core network with practically unlimited bandwidth. Through the use of flexible WDM bandwidth allocation schemes that provide bandwidth where needed [1], and cheap mass-produced densely integrated optical components, the cost can be reduced significantly. The channels in the network, each with a capacity of 1.25 Gbit/s, can be allocated to a single or a group of users via reconfigurable nodes that are controlled from the central node where the various up- and downstream signals are handled. In this paper the design, fabrication and characterization of two possible implementations of the reconfigurable nodes, a 4-channel reconfigurable Optical Add Drop Multiplexer (rOADM) [2,3] and a 1x4x4 λ-router [4,5], both operating at 1310 nm will be discussed. Received 19 Jun 2007; revised Jul 2007; accepted Jul 2007; published 1 Aug 2007 6 August 2007 / Vol 15, No 16 / OPTICS EXPRESS 10347
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