Test Steps Sample Clauses

Test Steps. ‌ Figure 6-37 Receiver sensitivity with fiber propagation test a Connect the test system according to Figure 6-37. XXXX based on the characteristics of the optical module. Use the test pattern defined in Table 6-2. c When for a multi-lane optical module, ensure that each optical lane is tested individually by connecting to an external wavelength demultiplexer and all other lanes are in operation using the same test pattern. d Measure the optical power values of the two output ports of the splitter to P1 and P2 defined in Figure 6-37, and determine the optical power compensation value using the following equation: ΔP = P2 – P1. Then the receive optical power(P2) of the DUT can be calculated as P2=P1+ΔP. e Adjust the optical attenuator to 0 dB and wait for 12 seconds. After confirming the phase lock of the XXXX, wait until the BER is stable. Then record the BER after 12 seconds. f Adjust the attenuation value of the VOA until the measured BER is around BER 1E-6. Note: The step of adjusting the attenuation value is advised to be set at 0.5dB. g Adjust the attenuation value of the VOA until the measured BER rests stably 2.4E-4. Note: The step of adjusting the attenuation value is advised to be set at 0.1dB. h The above receive optical power and the corresponding BER are drawn as a BER curve, according to which the receive optical power corresponding to the target BER is obtained, namely, the ‘receiver sensitivity with fiber propagation’. i When for a multi-lane optical module, repeat the test for other lanes. 1 Refer to the notes of the receiver sensitivity test defined in 6.35. 2 The 0.47 dB/km at 1264.5 nm attenuation for optical fiber cables is derived from Appendix I of ITU-T G.695. 3 The 0.5 dB/km attenuation is provided for the outside plant cable as defined in ANSI/TIA 568-C.3. 4 The SECQ of reference transmitter's optical eye is 0.9 dB (an ideal input signal without overshoot). The test signal should have negligible impairments such as intersymbol interference (ISI), rise/fall times, jitter and RIN.

Test Steps. ‌ Figure 6-19 RINxOMA test a Connect the test system according to Figure 6-19. b Set the output service rate, modulation format, amplitude, test pattern and other parameters for the XXXX based on the characteristics of the optical module. Use the test pattern defined in Table 6-2. c Adjust the VOA. Test P1, P2, P3, P4, P5 defined in Figure 6-19 using the Optical power meter. d Calculate as follows: ΔP1 = P1 – P4, ΔP2 = P2 – P1, ΔP3 = P3 – P2. Then, calculate the reflected optical power as follows: Pr = P4 + ΔP1 + ΔP2 + ΔP3, x = |Pr – P5|, x should meet return loss of the specification. e Don’t let the optical power of the DUT enter the OSC. Enable the OSC optical port, use a histogram to collect the background noise of the OSC optical port, measure the RMS random noise power, obtain the standard deviation, and set the noise test result compensation value. Note: The upper –3 dB limit of the measurement apparatus is to be approximately equal to the signaling rate (i.e., 53.125 GHz). f When for a multi-lane optical module, ensure that each optical lane is tested individually by turning on only one laser under test or by connecting to an external wavelength demultiplexer and all other lanes are in operation using the same test pattern. g Let the optical power of the DUT enter OSC optical port through a short optical fiber patch cord (< 2 m). Use the OSC to measure the 3-level random noise power (RNthree) and the 0-level random noise power (RNzero) of the DUT optical eye. h Measure the optical modulation amplitude. i Calculate RINxOMA according to Equation 6-9. j When for a multi-lane optical module, repeat the test for other lanes.

Test Steps. ‌ Figure 6-8 RMS spectral width test a Connect the test system according to Figure 6-8. XXXX based on the characteristics of the optical module. Use the test pattern defined in Table 6-2. c When for a multi-lane optical module, ensure that each optical lane is tested individually by connecting to an external wavelength demultiplexer and all other lanes are in operation using the same test pattern.

Test Steps. ‌ Figure 6-9 Average launch optical power test a Connect the test system according to Figure 6-9. XXXX based on the characteristics of the optical module. Use the test pattern defined in Table 6-2. c When for a multi-lane optical module, ensure that each optical lane is tested individually by connecting to an external wavelength demultiplexer and all other lanes are in operation using the same test pattern. d Read the ‘average optical power’ on the Optical power meter. e When for a multi-lane optical module, repeat the test for other lanes.

Test Steps. ‌ RX Figure 6-22 Transfer delay test a Connect the test system according to Figure 6-22. b Read the delay value T0 on the Protocol analyzer without the optical module in self-loop. c Read the delay value T1 on the Protocol analyzer with the optical module in self-loop using a test fiber. d Calculate the ‘transfer delay’ as T1 – T0.

Test Steps. ‌ Figure 6-38 Interzone BER test a Connect the test system according to Figure 6-38. XXXX based on the characteristics of the optical module. Use the test pattern defined in Table 6-2. c Adjust the attenuation value of the VOA to the minimum value. Set the optical power values of the two output ports of the splitter to P1 and P2 defined in Figure 6-38, and determine the optical power compensation value using the following equation: ΔP = P2 – P1. Then the receive optical power(P2) of the DUT can be calculated as P2=P1+ΔP. Ensure that P2 is higher than the ‘average receive power, each lane (max)’. d When for a multi-lane optical module, ensure that each optical lane is tested individually by connecting to an external wavelength demultiplexer and all other lanes are in operation using the same test pattern. e Adjust the attenuation value of the VOA to ensure that the receive optical power of DUT is at the sensitivity point. f Adjust the attenuator value of the VOA to increase the receive optical power of the DUT until the receive power is near the DUT's overload point (specified ‘overload receive optical power’ minus 1 dB). Note: The step of adjusting the attenuator value is advised to be set at 0.5dB. g Adjust the attenuator value of the VOA to increase the receive optical power of the DUT until the receive power is the DUT's overload point. Read the BER at each point. Whenever the VOA adjustment is complete, wait a time interval until the BER at each point is stable and test the BER for 3 seconds at each point. Note: The step of adjusting the attenuator value is advised to be set at 0.1dB. h Draw the sensitivity curve of receive optical power and BER. i When for a multi-lane optical module, repeat the test for other lanes. 1. Refer to the notes of the receiver sensitivity test defined in 6.35. 2. The SECQ of the reference transmitter's optical eye is 0.9 dB (an ideal input signal without overshoot). The test signal should have negligible impairments such as inter-symbol interference (ISI), rise/fall times, jitter and RIN.

Test Steps a Connect the test system according to Figure 6-11. Other equivalent measurement implementations may be used with suitable calibration. XXXX based on the characteristics of the optical module. Use the test pattern defined in Table 6-2. c When for a multi-lane optical module, ensure that each optical lane is tested individually by connecting to an external wavelength demultiplexer and all other lanes are in operation using the same test pattern.

Test Steps. ‌ RX Figure 6-35 Maximum skew variation test a Connect the test system according to Figure 6-35. b Configure the matched service on Protocol analysis instrument for the DUT and adjust the attenuation value of the VOA to ensure that the module works properly.

Test Steps. ‌ Figure 6-15 Encircled flux test a Connect the test system according to Figure 6-15. XXXX based on the characteristics of the optical module. Use the test pattern defined in Table 6-2. c When for a multi-lane optical module, ensure that each optical lane is tested by turning on only one laser under test or by connecting to an external wavelength demultiplexer and all other lanes are in operation using the same test pattern. d Read the ‘EF’ on the Encircled flux meter. Note: The test is advised to cover the 19 µm and 4.5 µm diameter points. e When for a multi-lane optical module, repeat the test for other lanes.

Test Steps. ‌ Figure 10-2 FEC capability test under interworking test a Connect the test system according to Figure 10-2. b Set the output service rate, modulation format, amplitude, test pattern and other parameters for the d Adjust the attenuator value of the VOA to gradually reduce the optical power received by the optical module, until the bit error detected by the XXXX disappears. Note: It is recommended that the adjustment step of the attenuator be set to 0.5 dB and that when receiver optical power approaches the receiver sensitivity limit, the adjustment step of the attenuator be set to 0.1dB. e Check the performance of the optical module, record the BER before correction and the bit error distribution.