Quiz — Lumerical INTERCONNECT — Time Domain Simulations

INTERCONNECT — Time Domain Sims Quiz — Lumerical INTERCONNECT — Time Domain Simulations Quiz — Lumerical INTERCONNECT — Time Domain Simulations

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Question 1 of 25

1. Question
How does the data flow in a time-domain simulation in INTERCONNECT?
- All the elements get the data from source at the same time.
- Data flows from element to element using a dynamic data flow scheduler.
- Data does not pass through the elements. All calculations happen at the analyzers.
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Question 2 of 25

2. Question
For which of the following circuits is it appropriate to use Transient Sample Mode for time-domain simulations? (Select all that applies).
- Circuits with bidirectional propagation of optical signals
- Photonic circuits where reflections must be considered
- Nonlinear optical fiber simulation
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Question 3 of 25

3. Question
In the time-domain, the response of an element to an input signal can be calculated through the time-convolution of the input signal with the element’s impulse response. In Transient Sample Mode, the signal through an element is calculated sample by sample, and the convolution becomes a discrete convolution as shown below. What role does a digital filter play in the discrete convolution?
- Input signal, x
- Impulse response, b
- Output signal, y
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Question 4 of 25

4. Question
Which of the following approaches is used to calculate output signals in Transient Block Mode simulations?
- Sample-by-sample discrete time domain convolution
- Fourier transform methods and the Convolution theorem
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Question 5 of 25

5. Question
Which of the following statements apply to Transient Block Mode simulations? (Select all that apply)
- Best suited for unidirectional simulations.
- Bidirectional simulations are possible using multiple iterations.
- Digital filters are not used.
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Question 6 of 25

6. Question
Which of the following are true?
- The CW laser source is the only optical source available for time domain simulations.
- The CW laser source can only be used for Transient Sample Mode time domain simulations.
- In the CW laser source, the value of the “output signal mode” property is set to “block” by default.
- In the CW laser source, the value of “output signal mode” property inherits the Root Element “output signal mode” property value by default.
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Question 7 of 25

7. Question
To use an ONA for a time domain simulation of a circuit, the “analysis type” should be set to:
- Scattering data
- Impulse response
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Question 8 of 25

8. Question
The image below shows three independent circuits connected to Optical Oscilloscope (OOSC) elements. Which of the following corresponds to the matching optical power signals measured by the OOSC_1, OOSC_2, and OOSC_3, respectively?
- A, B, C
- A, C, B
- B, C, A
- B, A, C
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Question 9 of 25

9. Question
If the bit rate is 2.5e10 bits/s, the number of samples is 2400, and the sample rate is 1.6e12 Hz, what is the time window? Please answer in units of nanosecond with 1 decimal precision.

(For example, if the answer is 50.64 ns, then type 50.6.)
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Question 10 of 25

10. Question
If the sample rate is 1.6e12 Hz, what is the simulation time step? Please answer in units of picoseconds with 3 decimal precision.

(For example, if the answer is 2.341 ps, then type 2.34.)
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Question 11 of 25

11. Question
Which of the following settings is NOT recommended when you want a waveguide element to accurately model the group delay?
- Set “digital filter” to true.
- Set “single tap filter” to false.
- Set “number of taps estimation” to disabled.
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Question 12 of 25

12. Question
Which of the following statements is true?
- The same digital filter settings should be used for all s-parameter elements.
- The digital filter settings of an S-parameter element depend on the element’s role in the circuit.
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Question 13 of 25

13. Question
In which case should we set the “number of taps estimation” to fit tolerance for an s-parameter element?
- When getting an accurate group delay is very important.
- When the frequency dependent transmission amplitude is most important.
- When there is no group delay and the transmission amplitude is constant over the frequency range of interest.
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Question 14 of 25

14. Question
Which of the following statements is true?
- The “delay compensation” property is used in time domain simulations.
- The “delay compensation” property is used in frequency domain simulations.
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Question 15 of 25

15. Question
If there are 4 elements inside the ring of a ring resonator, two of which are waveguides, then what should be the best choice for the “delay compensation” properties of the two waveguides in a Transient Sample Mode simulation?

(Hint: Which options give the correct total delay compensation and allow for the lowest possible sample rate? )
- 4 and 0
- 1 and 3
- 2 and 2
- 1 and 1
- 4 and 4
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Question 16 of 25

16. Question
How do you calculate the time delay of a waveguide?
- length x group index / speed of light
- length x effective index / speed of light
- length x group index / (2 x speed of light)
- length x effective index / (2 x speed of light)
- length / (speed of light x group index)
- length / (speed of light x effective index)
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Question 17 of 25

17. Question
A circuit is set up for a Transient Sample Mode time domain simulation. It includes one waveguide, which has the “number of tap estimation” set to group delay and "delay compensation" set to 4. The waveguide has "effective index 1" = 2, "group index 1" = 2.5, and "length" = 20e-6. What is the minimum sample rate of the simulation, if we are interested in the TE mode? (Assume only the waveguide contributes to the group delay). Please provide your answer in units of THz, with 1 decimal precision.

(For example, if the sample rate is 1.23 THz, then type 1.2.)
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Question 18 of 25

18. Question
In the demo shown in the video, which of the following settings are necessary to assure an accurate free-spectral range?

(Select all that applies).
- Setting non-zero “delay compensation” values in the waveguide elements.
- Setting the “number of fir taps” to 1 in the waveguide coupler elements.
- Increasing the “sample rate” from 2e12 to 1e13.
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Question 19 of 25

19. Question
What is the free spectral range of a ring resonator with a group index of 4 and a radius of 5 microns?

(Insert your answer in units of TeraHertz [THz] with one decimal place precision. For example, if the answer is 1.236 THz, type in 1.24).
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Question 20 of 25

20. Question
Which of the following statements is true for a Transient Block Mode simulation?

(Check all that apply).
- The length of the block is defined by the “time window” property of the Root Element.
- Different sources can have different sample rates.
- The value for the “number of output signals” property determines how many blocks are generated by each element.
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Question 21 of 25

21. Question
If the sample rate is 10 THz and the time window is 5 ns, what is the number of samples?

Please answer the integer value.
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Question 22 of 25

22. Question
Consider an Optical N Port S-parameter element that captures the response of a grating coupler in a time domain Transient Sample Mode simulation. The transmission amplitude is of critical importance, and the digital filter "number of taps estimation" is set to fit tolerance. What methods can be used to improve the accuracy of the simulated transmission amplitude? Assume all sources in the simulation have the same sample rate.
- Increase the digital filter fit tolerance
- Decrease the digital filter fit tolerance
- Increase the sample rate
- Decrease the sample rate
- Increase the simulation time window
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Question 23 of 25

23. Question
What is the recommended setting for a waveguide that will be used in both frequency and time domain (Sample Mode) simulations?
- Set “number of tap estimation” to false
- Set “number of tap estimation” to fit tolerance
- Set “number of tap estimation” to group delay
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Question 24 of 25

24. Question
A circuit is set up for a Transient Sample Mode time domain simulation. It includes two waveguides, which each have the “number of tap estimation” set to group delay and "delay compensation" set to 2. Waveguide 1 has "effective index 1" = 2, "group index 1" = 3, and "length" = 50e-6. Waveguide 2 has "effective index 1" = 2.5, "group index 1" = 4, and "length" = 20e-6.

What is the minimum sample rate of the simulation, if we are interested in the TE mode? (Assume only the waveguides contribute to the group delay).

Please provide your answer in units of THz, with 1 decimal precision. (For example, if the sample rate is 1.23 THz, then type 1.2).
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Question 25 of 25

25. Question
Download the ring_resonator_time_domain.icp file. The ONA is set up to run the simulation in Transient Sample Mode. Set up the “delay compensation” property of the waveguides. Run the simulation to extract the FSR of the ring near a frequency of 193.2 THz. Hint: Look at the free spectral range result for the drop port (input 2).

Write the value in units of TeraHertz (THz) with two decimal place precision. (For example, if the answer is 1.233 THz, type in 1.23).
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INTERCONNECT — Time Domain Sims

Quiz — Lumerical INTERCONNECT — Time Domain Simulations

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