Systems and methods providing synchronization for multiple optical detectors wherein a radiant power delivered to a second light detector from a first light source is at least 25 percent of radiant power delivered to a first light detector from the first light source

An optical detection system for detecting object speed and position, comprising:

• a first device, the first device having a first light source and a first light detector, wherein the first device is configured to turn on and off the first light source based on a first control signal received by the first device;
• and
• a second device, the second device having a second light source and a second light detector, wherein the second device is configured to turn on and off the second light source based on a second control signal received by the second device, wherein:
• the first light source and the second light source are configured to emit light during respective, non-overlapping time periods;
• the first light source and the second light source are configured to emit light in wavelength ranges that overlap;
• and
• when the first light source is turned on, a radiant power delivered to the second light detector from the first light source is at least 25 percent of a radiant power delivered to the first light detector from the first light source.