Test Steps Sample Clauses
Test Steps. Figure 6-36 Receiver sensitivity test a Connect the test system according to Figure 6-36. ▇▇▇▇ 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 6-36, 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 a time interval. After confirming the phase lock of the ▇▇▇▇, wait until the BER is stable. Then record the BER after 3 seconds. Note: Calculate the time interval of error bits accumulation when the is BER tested based on confidence (95%), BER (2.4E-4), and the following equation: Equation 6-16: CL = 1 − e−Nbits×BER Where: CL: confidence Nbits: bits accumulation that the pattern generator sends in the time interval. BER: bit error ratio. The time interval of error bits accumulation is 2.35E-7s when CL is 95% and the BER is 2.4E-4. The test duration is 3 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 received optical power corresponding to the target BER is obtained, namely, the ‘receiver sensitivity’. i When for a multi-lane optical module, repeat the test for other lanes. Note: 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. Figure 6-8 RMS spectral width test a Connect the test system according to Figure 6-8. ▇▇▇▇ 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 6-15 Encircled flux test a Connect the test system according to Figure 6-15. ▇▇▇▇ 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 7-1 Module output test setup Connect the test system according to Figure 7-1. Add the pattern generator at TP1 and use the data pattern QPRBS13-CEI. Add crosstalk generators at all other lanes. Connect TP2 and TP3 of the optical module with a short optical fiber. The tested signal at TP4 is transmitted to the oscilloscope and the reference CRU with a microwave pike-off. The CRU uses a first-order transfer function with a 3 dB tracking bandwidth of fb/6640. Configure the oscilloscope to collect 10 samples/UI and 2048 samples/waveform. Stop the test when 10 patterns and 100 waveforms are collected.
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 ▇▇▇▇ 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.
Test Steps. b ▇▇▇▇ cannot be directly connected to the module a Connect the test system according to Figure 6-2. b Set the output service rate, modulation format, amplitude, test pattern, output frequency offset and other parameters for the ▇▇▇▇ based on the characteristics of the optical module. Use the test pattern defined in Table 6-2. Note: • The amplitude for the ▇▇▇▇ is advised to be set at 600mV. • Output frequency offset is advised to select six test points: –100 ppm, –60 ppm, –20 ppm, +20 ppm, +60 ppm, and +100 ppm. • The frequency offset adjustment rate is advised to be set at 5 ppm/s, 20 ppm/s, 50 ppm/s, and 100 ppm/s. c Check whether the BER of the DUT meets the requirement and read the packet loss rate, and alarm information about the DUT on ▇▇▇▇.
Test Steps. DUT TX Figure 6-1 Signal rate test a Connect the test system according to Figure 6-1. b Set the output service rate, modulation format, amplitude, test pattern and other parameters for the ▇▇▇▇ based on the characteristics of the optical module. Use the test pattern defined in Table 6-2. Note: The amplitude for the ▇▇▇▇ is advised to be set at 600mV.
Test Steps a Record the ‘OMAouter’ values of all lanes by referencing 6.8. b The ‘difference in launch power between any two lanes’ is the maximum ‘OMAouter’ of all lanes minus the minimum ‘OMAouter’.
Test Steps. Figure 6-21 Optical return loss tolerance test a Connect the test system according to Figure 6-21. ▇▇▇▇ 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.