13932
The arc deflects when a control light of a fixed wavelength and optical power is pumped into the bus waveguide , while the amount of deflection is monitored by measuring the transmission spectrum of a broadband probe light .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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