Lightwave Analyzer – How to use it?

[Liang Yang]

As mentioned in new features of optisystem 13.0, a new visualizer-Lightwave Analyzer are added into the library. So the problem is how to use it. Actually, i want measure the bandwidth of RSOA, can this visualizer be involved?

[Damian Marek]

Yes it can! The lightwave analyzer can be set to different input/output configurations depending on what you would like to do. You could for example set it to output an optical signal and read in an optical signal to find the frequency response of the RSOA. Using the component properties window you can set the characteristics of the laser and the frequencies to sweep in your simulation. The global parameter “Iterations” will set the number of frequency data points used.

Regards

[Liang Yang]

Thanks for your reply.

Enclosed is setup for my simulation to getting to know how to use this visualizer and measure the bandwidth of RSOA.

I give an electrical signal to directly modulate the RSOA at 1GHz and 2GHz. So i set the start frequency and stop frequency at 1 GHz and 2 GHz, use an E-O operation. I meanwhile set the iteration in global parameter to 2 as you said. But i am not sure the bitrate here in global parameters is 1 or 2? Or arbitrary value since the operation frequency is managed by start/stop frequency rather than this parameter?

I think i have correctly connect all the components but the result seems…

So could you help me in this example?

[Damian Marek]

Everything seems fine to me, except some details.

I changed the Iterations to 10 otherwise the simulation will only give you 2 points for the frequency transfer function. Bit rate shouldn’t matter here because the Lightwave Analyzer is the component generating the signal and it has its own internal frequency setting. Just set the bit rate close to the frequency of interest so the time window is in the right order of magnitude.

[Liang Yang]

Thank you! Damian.

Do you get any result in Slope responsibity? I get nothing in this graph. As mentioned in your tutorial, it has to be a curve as shown in attachment.

[Damian Marek]

In the Lightwave Analyzer you need to set the Analysis to Conversion Analysis for the responsivity graph.

[Liang Yang]

By the way, could you tell the bias current/bias amplitude for the RSOA, because from your examples RSOA_Modulator and RSOA_DownstreamTransmission, NRZs amplitute are set as 1/0 and 0.06/0.036 in Max/Min mode, respectively. On which amplitude of NRZ, this RSOA can be triggered.

[Ranjeet Kumar]

Hi everyone,
Could i understand , the way BER test set is used for PBRS, WE CAN USE Lightwave analyzer as Laser.
May be i am right. In the above osd file, i an unable to understand the applications of Lightwave analyzer properly.
so,please help me to clear my doubt .

[MHD NA]

it can be set to different input/output configurations depending on what you would like to do. You could for example set it to output an optical signal and read in an optical signal to find the frequency response of the RSOA. Using the component properties window you can set the characteristics of the laser and the frequencies to sweep in your simulation. The global parameter “Iterations” will set the number of frequency data points used.

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