Pin PD reaches its maximum sensitivity at 660

    PinPdLedAbbreviation Referecnces•         Thereforeit can be concluded that that photo diode PD reaches its maximum sensitivity at660 nm and PD at 820 nm. •         Inthe case when PD (660nm) is connected with LED  (820nm) the detected voltage is lower than thevoltage detected when PD (660nm) is connected with LED (660nm) (actually itcoincides with the voltage measured without optical signal), because thephotodiode PDreaches its maximum sensitivity at 660 nm and the attenuation ofthe fiber is higher at 820 nm than at 660 nm.•         Inthe case when PD(820nm) is connected with LED (660nm)  the detected voltage is lower than thevoltage detected when connecting PD(820nm ) with LED  (820nm) because PD reaches its maximumsensitivity at 820nm .ConclusionAs for the kit experiment we have arrived to the sameresults and number patterns and using the voltmeter and oscilloscope to arriveto the results.

 Results table Conclusion   ·        LED 820 nm optical sourceemitting light received by a 660nm photodiode. ·        LED 820 nm optical sourceemitting light received by a 820nm photodiode.·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·         ·          LED 660 nm optical source emitting light received by a820nm photodiode      .Figure 1: Optiwave design  ·        LED 820 nm optical sourceemitting light received by a 660nm photodiode.·        LED 820 nm optical sourceemitting light received by a 820nm photodiode.

·        LED 660 nm optical sourceemitting light received by a 820nm photodiode.·        LED 660 nm optical sourceemitting light received by a 660nm photodiode and The summary of the results of the simulationand kit results are shown below  The kit experiment and the Optiwave experimentswere done successfully and seamlessly reaching consistent results andconclusion.RESULTS AND SIMULATION The power meter visualize and Oscilloscope visualize results were recorded for each case.·        LED 660 nm optical sourceemitting light received by a 820nm photodiode.·        LED 660 nm optical sourceemitting light received by a 660nm photodiode and ·        LED 820 nm optical sourceemitting light received by a 660nm photodiode.·        LED 820 nm optical sourceemitting light received by a 820nm photodiode.

In Optiwavesoftware , the experiment implementation started by generating bits by a pseudorandom bit sequence generator entering an NRZ pulse generator and into an LEDoptical light source .The LED optical source output was connected to OpticalPower Meter and Optical spectral analyzer to read the optical power value .Alsothe LED optical source was connected to an optical fiber with a photo detectorat the end of it .The photo detector output was connected to electrical powermeter visualize and Oscilloscope visualize and BER analyzer.

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This sameexperiement was repeated for 4 cases On MCM40 kit, we started with powering up the module andremoving all the jumpers. Then we started by connecting the LED 820nm with thePhotodiode 820 nm using the required kit jumpers to implement theconnection  and through optical fibercables .Then we used the voltmeter and  the DC oscilloscope to read the results afterthe LED optical source emitted the light and after it was received andtransmitted to an electrical current by the photo detector.

The same steps wererepeated to form a mix and match procedure for the LED 820 nm optical sourceemitting light received by a 660nm photodiode, LED 660 nm optical sourceemitting light received by a 660nm photodiode and LED 660 nm optical sourceemitting light received by a 820nm photodiode. The voltmeter and oscilloscoperesults were recorded for each case. The implementation of the experiment was done in two was:on the MCM40 optical fiber trainer kit & using Optiwave software and bothlead to the same results.

 METHODLOGY +The goal of this experiment is to study the characteristics of photo detectors .Itfocuses on the sensitivity of the photodiodes .The sensitivity of photodiodesis define the ratio of the generated current and incident optical light poweras a small current proportional the light intensity is generated. Thesensitivity is proportional the wavelength of light.

Thus, an experiment testingphotodiode sensitivity to LED optical wavelength is studied and .OBJECTIVE Fromexam paper Avalanche  They are the most common photo detectors .Theconsist of p and n regions with a The reverse-biased pn junction has aregion, named the depletion region which is depleted of charge carriers and where alarge built-in electric field opposes flow of electrons from the n-side to the p-side. When such ap–n junction is illuminated with light on one side, electron–hole pairs arecreated through absorption. The resulting current is proportional to theincident optical power. Thus a reverse-biased p–n junction acts as aphoto detector and is referred to as the p–n photodiode.pin Photodiodes There are two types of photo destectors PIN  photodiodes and Avalanche photodiodes .

Photodiodes are used at the receiver side of anoptical fiber .Their main job is to convert the optical light signal to anelectrical signal carrying the requested data. The requirements for a photodetector are like  those of an optical source. It must have highsensitivity, low cost ,fast response, low noise, , and high reliability.requirements INTRODCTION  In this paper, we will focus on photodiodes working as photo detectors and their characteristics Photo detectorsshould have high sensitivity, low noise, low cost and high reliability.Abstract – A Photo diodes is a pinsemiconductor .

Its main rule is to convert optical light signal into electricalcurrent.Operational Characteristics of Photodiodes used as Photodetectors in Optical System.                                                                          Shahd TantawiPrincess SumayaUniversity for Technology, [email protected]