| http://www.w3.org/ns/prov#value | - It will be understood by those skilled in the art that optical sources generally emit light with a range of wavelengths rather than at a single wavelength; this wavelength range may be relatively narrow if the optical source is a laser such as a VCSEL, or relatively broad if it is a non-lasing source such as an LED. The ???predetermined wavelength??? is typically in the near infrared (say 700 nm t
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