Search Results for 'wdm'

[Tamim]

Hello,
I am working on simulating a bidirectional TWDM-PON system in OptiSystem.
The simulation works correctly for the downstream direction, but no results appear for the upstream direction (e.g., no BER or eye diagram).

Details:

· I used key components such as:
· Optical Line Terminal (OLT)
· Optical Network Units (ONUs)
· Bidirectional Fiber
· All settings match the research paper I am following.
· No errors appear during simulation, but the BER analyzer shows no results for upstream.

Has anyone encountered this issue before?
I would appreciate help in identifying the potential cause (e.g., interface settings, signal synchronization, or component configuration).

Thank you!

[Sumaya AL]

Hello,

I am trying to replicate the design from the paper:
“Design of Bidirectional TWDM-PON Network for High-Speed Internet Access in Industrial Zones”
using OptiSystem 22.

The paper uses bidirectional optical fiber, circulators, and 1×64 bidirectional splitters for both upstream (around 1530 nm) and downstream (around 1550 nm).

I am not sure about:

1. How to connect circulators and bidirectional splitters properly for both directions.

2. Whether I should first build the downstream only with normal fibers/splitters, then replace them with bidirectional components later.

3. How to match the Q-factor results (~2.0) shown in the paper.

Any guidance or example files would be really helpful.

Thank you!

[Sumaya AL]

HELO
I want to simulate Bidirectional TWDM-PON Using Optisystem 22 . Can someone help me? pls

[Saurabh BediModerator]

Hello Sumaya,

Thanks for reaching out to us.

We do have a specific example on TWDM-PON but that we provide only to our paid customers. If you really think you are going to use OptiSystem for your project for few months or a year, you can opt for leasing the OptiSystem for few months and pay accordingly for the license. The advantage of buying/leasing the license is that you get uninterrupted access, all the necessary regular updates plus you get access to specific examples (like TWDM-PON) and you also get comprehensive technical support.
If you are interested in purchasing the academic license then please click on the link below, follow the instructions, and apply for the license.

Getting an Optiwave Student License

If you decide not to purchase the license then for now you can refer to the example (Dynamic GPON.osd) as a reference to build your project. The project is located at C:\Users\USER NAME\Documents\OptiSystem 22.1 Samples\Metro and access systems\PON and CDMA systems\.

Let me know if you are interested in buying the academic license which we offer at very subsidized rates.

I hope this helps?

Best,
Saurabh Bedi.

[Sumaya AL]

I want to simulate Bidirectional TWDM-PON Using Optisystem 22 . Can someone help me? pls

[R D SOUMITRA]

I want to monitor the Q Factor and BER values from the eye diagram analyser and compensate chromatic dispersion accordingly in a 16 channel WDM system. How to employ the new machine learning component in Optisystem for achieving this objective?

[R D SOUMITRA]

I am simulating a 16 channel WDM system. I want to plot BER v/s received power. How to vary the received power of the system simulated in optisystem?

[Duc Nguyen]

Mình đang làm bài tập lớn mô phỏng Hệ thống WDM-FSO sử dụng điều chế QPSK tuy nhiên chưa biết bắt đầu từ đâu ạ. Bạn nào có tài liệu thì cho mình xin với ạ, mục tiêu cuối sau mô phỏng là vẽ được đồ thị BER phụ thuộc vào khoảng cách kênh FSO.
Các bạn nếu không có FSO thì cho mình xin file mô phỏng trên kênh thông tin quang cũng được ạ. Mình cần tham khảo để tạo bộ điều chế QPSK và giải điều chế QPSK, sau đó nối thêm khối BER như nào để nó ra được đồ thị mẫu mắt và có giá trị BER ấy ạ, mình đang vướng mắc chỗ đó.
Cảm ơn mọi người nhiều !

[sanjiv kumar]

Godmorining
I am writing this mail to learn about the Noise effect on the FBG sensor output. Therefore, I want to add a noise effect to the WDM FBG sensor model, but I do not understand how to do so. Can anyone on this platform help me add noise to the signal when we use the white light source for inputting the FBG sensors?

[Scott NewmanModerator]

Hello Lintang,

Are you able to share with us your osd (OptiSystem design) file? The answer will depend on what you are labelling WDM System. THe WDM Analyzer requires access to noise bins so these must exist. While this is true in the WDM systems it is also present in other modulation setups. If you review the samples folder installed with the product “Documents\OptiSystem 22.0 Samples” and review the Advanced modulation systems you will find multiple examples of the WDM Analyzer tools used. For example within the QAM section review the design “8DWDM Channels 112Gbps Coherent DP-16QAM_Trans with DSP.osd”.

Regards,
Scott

[Lintang]

Hi guys!
If my system does not use WDM System, can I use WDM Analyzer to take OSNR data?

[Ayush Kumar]

I am working on a hybrid FSO-PON architecture in optisystem , I am getting high error and only 4 data points in constellation diagram. How do I solve these problems.
parameters are set as
4BBUs:
PRBS-10Gbps
QAM -4QAM
OFDM-512 subcarriers,8 prefix points , 256 subcarriers per port and power 10dBm
Qyadrature modulator – default parameters
Modulation is done using source from a frequency comb generator (193.414-193.489Thz) 25GHz spacing
WDM bandwidth 10Ghz
SMF-15Km
FSO -default
Reciever:
after FSO there are photodetectors (PIN)
the quadrature demodulator
OFDM demodulation block
QAM sequence decoder
NRZ
BER analyser
so how do I set the parameters to get proper results please assist
link of reference paper <a href=”https://doi.org/10.3390/ photonics10101073″></a>

[Ayush Kumar]

Hello everyone,

I’m currently working on a hybrid FSO-PON WDM architecture in OptiSystem that uses a comb generator as the optical source. However, I am facing some serious issues with high Symbol Error Rate (SER) and Error Vector Magnitude (EVM) at the receiver. I am trying to implement the architecture given in this research paper <a href=”http://, 1073. https://doi.org/10.3390/ photonics10101073″></a>
Each base band unit on the transmitter side starts with a PBRS block (bit rate 10Gbps) followed by QAM sequence genrator (4QAM), OFDM modulation block (512 subcarriers, location= 1-256, prefix points=8 and ofdm power= 12dBm), quadrature modulator this signal was modulated with 193.414Thz produced by the comb generator using a MZM modulator and rest of the system is the single mode fiber and fso links followed by photodetectors the demodulators.
The problem I am facing is the high symbol error rate at the OFDM demodulator and have doubts about the phase of the quadrature modulator as well please assist on how to improve the system.

[Saurabh BediModerator]

Hello,

Thanks for reaching out to us.

There could be few reasons why your BER doesn’t display anything else except the eye-diagram. Make sure your setup is correct and the global parameters you have entered are making sense as per your application. You can’t sweep the bit rate in the global parameters. So when you say you are sweeping bit rate from 1Mbps to 5Mbps, what exactly you are sweeping?

To check the effect of parameter sweeps of any component on the BER, please refer to the example: C:\Users\USERNAME\Documents\OptiSystem 22.0 Samples\Introductory tutorials\Lesson 4 Parameter Sweeps – BER x Input power.osd

Sometimes, the circuit needs multiple signal iterations for simulation to converge and this can be setup by going to “Signals” window in the global parameters and setting the “Iterations” to a higher value. Once your system simulation converges, then you can visualize the change in the graphs of the BER by incrementing the value of “Signal Index” on the top right corner of the BER Analyzer window.
Please refer to the following example: C:\Users\USERNAME\Documents\OptiSystem 22.0 Samples\Microwave and RoF optical systems\Radio over Fiber WDM SCM ASK.osd

Hope this helps?

Warm Regards.
Saurabh Bedi.

[Akter Ul Alam]

I am trying to find optimal solution for “Resilient Optical Transmission Network design utilizing WDM and IP/MPLS (SRV6) technology.
(1) Required component for resiliency – Existing features in IP and DWDM (2) Physical layer requirement etc