Stable opto-electronic oscillators （OEOs） are realized using long fiber delay lines and changes in the index of refraction of high quality factor delay line results in temperature sensitivity of OEOs. Temperature se...Stable opto-electronic oscillators （OEOs） are realized using long fiber delay lines and changes in the index of refraction of high quality factor delay line results in temperature sensitivity of OEOs. Temperature sensitivity of various OEOs is measured to compare index of refraction variation of standard （SMF-28） and photonic crystal fiber （PCF）. Both hollow-core （HC） and solid-core （SC） versions of PCF are quantified. SC-PCF exhibited a factor of three reductions in the rate of index of refraction change （about ＋4.7 ppm/℃） with temperature over SMF-28 （about 12 ppm/℃） based OEO. Although HC-PCF have a greater attenuation per unit length, but those fibers have demonstrated a negative rate of change （about - 0.6 ppm/℃） in the effective index of refraction with temperature and prospect of thermal stability in the OEO using passive techniques is great when a combination of HC-PCF and SMF-28 are employed as fiber delay lines.展开更多
The electronic structures of Ⅲ—Ⅴ group of compounds GaSb and InSb of which crystal structures are blende structures are generally regarded as sp^3. But recently, a lot of experiments about exact electronic structur...The electronic structures of Ⅲ—Ⅴ group of compounds GaSb and InSb of which crystal structures are blende structures are generally regarded as sp^3. But recently, a lot of experiments about exact electronic structures have shown that the theory of sp^3 is too rough, for example, the difference of M(?)ssbauer isomer shift展开更多
基金supported by F. Deborgies from the European Space Agency (ESA)
文摘Stable opto-electronic oscillators （OEOs） are realized using long fiber delay lines and changes in the index of refraction of high quality factor delay line results in temperature sensitivity of OEOs. Temperature sensitivity of various OEOs is measured to compare index of refraction variation of standard （SMF-28） and photonic crystal fiber （PCF）. Both hollow-core （HC） and solid-core （SC） versions of PCF are quantified. SC-PCF exhibited a factor of three reductions in the rate of index of refraction change （about ＋4.7 ppm/℃） with temperature over SMF-28 （about 12 ppm/℃） based OEO. Although HC-PCF have a greater attenuation per unit length, but those fibers have demonstrated a negative rate of change （about - 0.6 ppm/℃） in the effective index of refraction with temperature and prospect of thermal stability in the OEO using passive techniques is great when a combination of HC-PCF and SMF-28 are employed as fiber delay lines.
文摘The electronic structures of Ⅲ—Ⅴ group of compounds GaSb and InSb of which crystal structures are blende structures are generally regarded as sp^3. But recently, a lot of experiments about exact electronic structures have shown that the theory of sp^3 is too rough, for example, the difference of M(?)ssbauer isomer shift
