Open Access
Review

Table 3

Comparison of research literature on OTTDLs.

Structure Delay accuracy/ps Adjustable delay range/ps Scanning range Frequency/GHz Chip platform Footprint (mm2)
MRR [28] 0–236 10.7–12.75 TriPleXTM waveguide
MRR [29] 0–500 10 Si3N4 waveguide 90
MRR [30] 20 0–160 0–16 SOI 8
GDL [33] 6.6 60 10 SOI
GDL [34] 4.7 181.9 10 Si
GDL [35] 0.2 200 −36.8° to +36.8° 8–12 SOI
PS [36] 13.5 148.5
OS [37] 2.5 0–96 −75.51° to 75.64° 8–18 SOI 42.8
AWG [38] 10.3 20,000

Note: MRR stands for Miniature Resonant Ring; GDL stands for Grating Delay Line; AWG stands for Array Waveguide Grating; PS stands for Path Switching; OS stands for Optical Switch.

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