All-Optical Logic Gates: Designs, Classification, and Comparison

Table 1

Comparison between non-SOA based gates.

Reported gates category	Reported; gates	Contrast ratio/extinction ratio	Operating; speed	Modulation; type	Nonlinear element	Polarization; sensitivity	Integration; capacity
HNLF/DSF	XOR/OR/NOT/; AND/NXOR/; NOR/XNOR	20/24.25/30/1; 6.5 dB	40 G/10 Gb/s	FWM/XPM; /SPM/NPR	DSF/; HNLF-DSF/; DSF	More	Bad
Waveguide; configuration	XOR/NOR/; NOT/NAND/; AND	30/20 dB	40 G/100 Mb/s	FWM/TFA	FP Chip/ waveguide	More	Moderate
Circulator	NOR/NOT	—	10 Gb/s	Gain; modulation	FP-LD	More	Moderate
Optical; channel-Dropping; filter	AND/OR	—	—	Dark-bright; solitons	OCDF	No	Moderate
Multibranch; waveguide	AND/OR	—	—	Localized; optical; non-linearity	Multibranch; non-linear; media	More	Compact
Double heterostructure optical thyristor	AND/OR	50 dB	—	—	VCL-DOT	No	Compact
AOTF	AND/OR	—	300 Gb/s	SPM	AOTF	More	Compact