FIG 3 is a plot illustrating quantitatively temperature dependent center wavelength shift, expressed as a temperature tuning coefficient in units of picometers/° C., as {HEAD ~ a function} of {TAIL ~ substrate thickness} 
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FIG 3 is a plot illustrating quantitatively temperature dependent center wavelength shift , expressed as a temperature tuning coefficient in units of picometers/ ° C. , as { HEAD ~ a function } of { TAIL ~ substrate thickness }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL