Architectures

The level of integration in our switch module makes it highly flexible. A range of advanced switch architectures to be implemented with this single component.

A single module can support up to 48 individual 1×12 WSSs (see Figure 1). The majority of the optical, packaging and control components are shared between the switches, substantially reducing in the cost, space and power consumption of each individual switch.

Architecture Fig 1

Figure 1 – Stacked WSS module as multiple 1xN WSSs.

Multiple switches can be cascaded to a create a single, ultra-high port count switch, up to 1×144 (see Figure 2). This market-leading port count enables a range of new client-side ROADM architectures, and allows greater network flexibility in datacom applications. The cascaded design also provides inherently low crosstalk.

Architecture Fig 2

Figure 2 – Stacked WSS module as ultra-high port count 1xN WSS.

Individual switches can also be combined with a fibre shuffle network, to produce an NxN (see Figure 3). Any wavelength channel from any input port can be sent to any output port. This is a fully functional, non-blocking 12×12 WSS can be realised, using only a single LCoS panel.

Architecture Fig 3

 

Figure 3 – Stacked WSS module as NxN WSS.

The switch module is also capable of switching space-division-multiplexed channels, in combination with waveguide spatial demultiplexing elements (see Figure 4). The complete switching capability required for this complex operation can be provided by a single module.

Architecture Fig 4

Figure 4 – Stacked WSS module as WSS for SDM channels.

None of these implementations use the whole capacity of the integrated switch module. It is therefore possible to implement different combinations of 1xN, ultra-high port count 1xN, NxN, and spatial super-channel switches in a single module, without changing the optical design. Each integrated module can hence be optimised for any given application.

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The two-dimensional holographic switching technology powering the switching module can be used to implement a range of advanced control features.

Two-dimensional beam steering allows software-controlled optimisation of the module’s optical alignment, improving optical performance and reducing alignment costs.

Phase masks can be added to the beams of individual wavelength channels by the LCoS SLM, substantially reducing switch crosstalk.

Holograms can also be designed to support optimised beam profiles, to improve the switch passband performance.

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