| http://www.w3.org/ns/prov#value | - an i-th light feedback element among (n???1) light feedback elements, each arranged at an optical distance Li from the front facet on the optical path of the output light (where i=2 to n, n is a positive integer not less than 2, and Li>L1), the i-th light feedback element each having a reflection center wavelength substantially equal to the reflection center wavelength of the first light feedback
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