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Interference signals I in volts (V) for the case where the probe beam supply optical fiber is 40 m long (m = 51). The 80 MHz beat wave is very fast on this time scale, so the traces blend into solid fills. The black curves plot the upper and lower envelopes I + and I ?, tracing the time varying maximum and minimum interference levels, respectively. The inset key identifies the optical path length deviation Z S from the probe path for which there is no envelope oscillation.
Source publication
The interference signal visibility V (difference to sum ratio of intensities at maximum and minimum interference) of an interferometer that uses a multimode laser is here derived for a given laser gain profile and spectral mode separation as a function of the difference ZS between the probe and reference beam optical path lengths and the spectral s...
Contexts in source publication
Context 1
... decreases if there is a mismatch between probe and reference paths for a given value of m. It is observed for our system, as plotted in Fig. 2, waveform envelopes (identified by dotted, dashed, and solid black lines) describing a slowly varying (relative to 80 MHz) quasi-periodic time dependence of maximum and minimum interference signal levels is observed to oscillate between upper and lower bounds. V is observed to oscillate between maximum and minimum values V + and V − , ...Context 2
... no information could be obtained as to whether this is an experimental or theoretical result based on G(x) or, if the latter, what assumptions are made about k s . It is provided here for qualitative reference only. As an alternative, analysis of the interference signals' records from heterodyne to acoustic bands, such as those plotted in Fig. 2, can be used to determine W . For this purpose, the envelope bounding the ω B /2π = 80 MHz heterodyned carrier wave is inferred by analysis of the digitized signal data set {I i } recorded at times {t i } under the assumption that it has the ...Context 3
... plots are illustrated in Fig. 2, along with the original corresponding waveforms. Figure 5 plots W vs. Z S of the JDSU 1145P for a number of values of m based on the beat wave envelopes of recorded waveforms of the interference signal, as calculated by Eqs. (35), (1), and (29). Fiber non-uniformity prevents direct measurement of Z S for the experimental data, so the ...