About Optical Isolator
Isolator functions andtypes:
Signallight from the light source to the receiver of the transmission process, passesthrough many different optical interface, in each of the optical interface, allcan produce different degree of reflection, the reflection of Cheng Guang backeventually along the light path back light source. When back to the strength ofthe Cheng Guang accumulate to a certain extent, it could cause lightwork is not stable, produce the problem such as frequency drift, amplitudechange, thus affecting the normal work of the whole system, it becomes animportant problem that must be addressed. Thus appeared a only allow lightalong the light path forward transmission non reciprocity of passivecomponents, optical isolator, and similar to function of diode in electronicdevices.
Òclassification：
ÐIn the linear
Single-stage isolator
With a compensation
No compensation
Dual-stage isolator
Mini isolator
Free space type
-Single-stageisolator
-Dual-stage isolator
The tail fiber type freespace isolator
isolator applications:
ÒSinglelongitudinal mode laser: the DFB laser output is already high, its workingwavelength drift although is small but can still occur under the high frequencymodulation spectrum widening, the phenomenon of long distance to the detrimentof high bit rate transmission, in order to reduce the bandwidth, must join theisolator in laser interference to offset Cheng Guang back;
ÒFiberamplifier: long distance needs a large number of relay amplifier in opticalfiber communication, in order to guarantee the normal work of the amplifier,must be used on both ends of the high degree of isolation of isolator toeliminate the influence of Cheng Guang back;
ÒOpticalfiber CATV networks: requires a high power, low noise of the DFB laser, and asa result of the analog signal anti-interference ability is poor, so in thenetwork also need isolator;
ÒCoherentoptical communication, etc. · · · · · ·
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