Optical phased array filter module with passively compensated temperature dependence

Recent progress on athermal AWG wavelength multiplexer

“…One achieves compensation by moving the input optical fiber across the focal plane of an AWG as shown in Fig. 3 [14]. With this approach the input fiber is connected to the AWG chip through an intermediate metal rod.…”

Athermal AWGs for colourless WDM-PON with -40°C to +70°C and underwater operation

“…Fig. 1 shows schematic of the Ignis Photonyx athermal AWGs with a moving input fiber [8]. The fiber is fixed to a metal rod that contracts and expends with temperature to compensate the temperature dependency of the PLC.…”

“…However, as mentioned earlier, the Mux/Demux in a WDM-PON system must be completely passive. Passive, athermal AWGs have been demonstrated by combining guiding materials with opposite temperature dependence [5] or by packages with mechanical moving parts to stabilize the wavelength [6][7][8], where the latter methods are dominating the market due to better loss and temperature stability. Fig.…”

Technology Trends in Dense WDM Demultiplexers

“…One interesting approach to eliminating the temperature dependence is to vary the location of the input waveguide slightly. 18 In this design the fiber is coupled directly to the slab waveguide section. For a 16 channel 100 GHz device the insertion loss is less than 7 dB.…”