MITSUBISHI

MITSUBISHI LA51:FI DIUUt:.~ML8XX1 SERIESFOR OPTICAL COMMUNICATIONI Forward current va: voltageTypical forward current vs. vol,tage characteristicsare shown in Fig. 4. In general, as the casetemperature rises, the forward voltage VF decreasesslightly against the constant current IF. VF variestypically at a rate of - lo3mV /"C and - 1 mV /"Cat IF = 1 mA and 10mA, respectively.50:( 40.s~301::~il"E 20~0u-10Fig. 4 Forward current vs. voltageTc=70'C~UV 25 'C..J1.0 2.0Forward voltage VF (V)I Emission spectraTypical emission spectra under CW operation areshown in Fig. S. In general, at an output of SmW,several modes are observed. Longitudinal modespacings are typically 1 nm and spectral width(FWHM) is typically 3nm at an output of SmW.The peak wavelength depends on the operatingcase temperature and the forward current (outputlevel)...C> .t:l!!,5jFig. 5 Emission spectra under CW operationWavelength A (nm)A typical temperature dependence of the peakwavelength at an output of SmW is shown in Fig. 6.As the temperature rises, the peak wavelengthshifts to the long - wavelength side at a rate ofabout O.37nm/"C.Fig. 6 Temperature dependence of peak wavelength1215E 1210-5Q"" 1205.