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Agilent HFCT-5915E Characterization Report for MT-RJ Duplex Single Mode Transceiver
Application Note 1209
Introduction The HFCT-5915E transceiver is a high performance, cost effective module for serial optical data communication applications specified for a signal rate of 155 Mb/s. It is designed to provide an ATM/SONET/SDH compliant link for 155 Mb/s long reach applications over 0C to +70C temperature range. The module is intended for single mode fiber, operates at a nominal wavelength of 1300 nm and is packaged in an industry standard 2 x 5 platform. It incorporates Agilent's high performance, reliable, long wavelength optical devices and proven circuit technology to give long life and consistent service. The characterization was performed in accordance with Bellcore Specification TA-NWT-000983. Summary * The characterization demonstrates that the HFCT-5915E complies with the Product Specification * HFCT-5915E - SONET OC3 SDH STM-1 Compliant
This report evaluates the HFCT-5915E transmitter performance under all conditions against target parameters in the Product Specification. The HFCT-5915E receiver characterization has been completed by claimed similarity with the HFCT-5905E, due to common optical subassembly, electrical assembly and package style. The results of the HFCT5905E receiver characterization are included here from Application Note 1181 for completeness. The following transmitter parameters were characterized at 3.1 V, 3.3 V and 3.5 V at 0C, +25C and +70C: * * * * * * Output Power Extinction Ratio Transmitter Supply Current Wavelength Spectral Width Eye Mask
Definition of terms Transmitter Parameters Output Power (dBm) The optical output power is an averaged measurement using a 1 m MT-RJ patchcord terminated with an SC connector into a large area detector. This measurement allows for the loss of the MT-RJ Connector. The module was modulated at 155.52 Mb/s using a 2E23-1 PRBS data pattern . Extinction Ratio (dB) This is the ratio of optical power in a "1" or "on" logic state to the optical power in a "0" or "off" logic state. The Extinction Ratio is measured using a 1010... data pattern at 50 MHz. This gives a flat top and bottom to the output pulse in order to make accurate measurements. Transmitter Supply Current (mA) This is the current supplied to the transmitter at the relevant supply voltage including that drawn by the test fixture but excluding that drawn by the termination resistance network.
SONET/SDH compliant eye diagrams are also presented.
Wavelength (nm) The mean wavelength is measured on an optical spectrum analyzer. The transmitter is modulated with a 2E23-1 PRBS at 155.52 Mb/s. Spectral Width (nm) Spectral width is defined as the RMS width containing all modes with energy greater than 20 dB down from the peak wavelength. Transmitter Power Supply Noise Rejection Modules were measured using test fixtures fitted with the power supply filter shown in Figure 1. Wideband noise was introduced through a signal generator and the optical eye was viewed using an Agilent 83480A Digital Communications Analyzer with a SONET/SDH eye mask applied. The noise to the device is increased until the eye mask margin is reduced to 20%. Receiver Parameters Sensitivity (dBm) This measures the receiver sensitivity with a 2E23-1 PRBS input signal. The sensitivity is the minimum optical input power required so that the receiver can recover a signal with an error rate better than 1e-10. Receiver Supply Current (mA) This is the receiver supply current at the stated supply voltage excluding that drawn by the termination resistance network of the evaluation board. Signal Detect Levels (V) This is the measured voltage through 50 ohms, referenced to VCC -2 V at the signal detect output. Signal Detect is High during an `ON' state and low during an `OFF' state. Table 1 shows that Signal Detect levels are within data sheet specifications. Signal Detect Deassert (dBm) This is the point at which the signal detect flags low to indicate a loss of signal due to low optical power. 2
SD Deassert and Assert Times (s) The time taken for a high to low transition or a low to high transition after the optical input signal is removed or applied respectively. Measured with -7 dBm of optical power at the receiver input. Table 2 shows that Signal Detect Assert and Deassert times are within data sheet specifications. Receiver Power Supply Noise Rejection Modules were measured using test fixtures fitted with the power supply filter shown in Figure 1. Wideband noise was introduced through a signal generator and the receiver measured for 1 dB sensitivity degradation.
Overload (dBm) The maximum optical signal power to the receiver such that the recovered data has an error rate of 1e-10. This parameter was checked at 155.52 Mb/s using a 2E23-1 PRBS pattern. All receivers operate with a 8 dB margin above G.957 (-8 dBm).
J1 VCCT J3 VEET J2 VCCR J4 VEER C9 100 nF
+C8
L1 1 uH C7 100 nF
+C10
VCCT C1 100 nF
VCCT
10 uF
GND
GND
L2 1 uH 10 uF
VCCR C2 100 nF
VCCR
GND
GND
Figure 1. Multi Source Agreement Power Supply Filter
Table 1 - HFCT-5915E Signal Detect voltage levels with respect to VCC.
Units SD Low V SD High V Mean -1.80 -1.01 Min. -1.78 -1.00 Max. -1.82 -1.02 Product Specifications Min. Max. -1.84 -1.62 -0.88 -1.05
Table 2 - HFCT-5915E Mean, Minimum and Maximum Signal Detect Assert and Deassert times over temperature and voltage
Test Parameters SD Assert SD Deassert
Units s s
Mean 73.0 3.5
Min. 67.0 3.0
Max. 78.1 3.5
Limits Min. Max. 100 -
Results Summary Voltage Dependence One of the objectives for this characterization exercise was to assess the influence of voltage supply variation on transceiver performance. The summary of results shown in Tables 3a and b indicate that the HFCT-5915E has negligible dependence on supply voltage (within the limits of 3.1 V to 3.5 V) for parameters over the operating temperature range. As such there is sufficient confidence in evaluating remaining characterization parts under nominal 3.3 V voltage supplies over its rated operating temperature range.
Table 3a - HFCT-5915E Mean, Minimum and Maximum measured parameters over operating temperature at 3.3 V
Test Parameters Transmitter Supply Current Output Power Extinction Ratio Receiver Supply Current Sensitivity SD Deassert SD Hysteresis Units Measured Mean 73 -2.58 13.6 70.1 -38.9 -42.5 2.2 Minimum 52 -4.17 10.7 63.1 -39.7 -43.8 2.0 Maximum 101 -1.53 16 82.1 -37.0 -40.0 2.4
mA dBm dB mA dBm dBm dB
Table 3b - HFCT-5915E Mean, Minimum and Maximum measured parameters over operating temperature and voltage (3.1 V, 3.5 V excluding 3.3 V)
Test Parameters Transmitter Supply Current Output Power Extinction Ratio Receiver Supply Current Sensitivity SD Deassert SD Hysteresis Units Measured Mean 73 -2.57 13.6 71.2 -38.9 -42.5 2.2 Minimum 51 -4.16 10.33 61.6 -39.8 -43.8 2.0 Maximum 102 -1.52 16 84.8 -37.0 -40.1 2.5
mA dBm dB mA dBm dBm dB
3
Overall Performance Tables 4a, b and c show a summary of parametric performance at a nominal voltage supply of 3.3 V over the temperature range 0C, +25C and +70C. The results show that all parameters were within data sheet limits.
Table 4a - Temperature = 0C
Test Parameters Transmitter Supply Current Output Power Extinction Ratio Centre Wavelength Spectral Width Receiver Supply Current Sensitivity SD Deassert SD Hysteresis
Units
Mean
Min
Max
Limits Min -5.0 10 1285 -45.0 0.5
Max 140 0 1335 4 100 -34.0
-37.0
mA dBm dB nm nm mA dBm dBm dB
63 -2.69 14.13 1295 1.35 64.1 -39.16 -42.7 2.2
52 -4.17 11.61 1292 0.89 63.1 -39.7 -43.7 2.1
73 -1.82 16.0 1299 1.65 67.1 -37.6 -40.9 2.3
4.0
Table 4b - Temperature = +25C
Test Parameters Transmitter Supply Current Output Power Extinction Ratio Centre Wavelength Spectral Width Receiver Supply Current Sensitivity SD Deassert SD Hysteresis
Units
Mean
Min
Max
Limits Min -5.0 10 1285 -45.0 0.5
Max 140 0 1335 4 100 -34.0 -37.0 4.0
mA dBm dB nm nm mA dBm dBm dB
67 -2.50 13.6 1305 1.46 69.1 -38.91 -42.6 2.2
55 -3.22 10.8 1301 1.27 67.1 -39.4 -43.8 2.1
76 -1.53 15.83 1311 1.78 74.1 -37.2 -40.7 2.4
Table 4c - Temperature = +70C
Test Parameters Transmitter Supply Current Output Power Extinction Ratio Centre Wavelength Spectral Width Receiver Supply Current Sensitivity SD Deassert SD Hysteresis
Units
Mean
Min
Max
Limits Min -5.0 10 1285 -45.0 0.5
Max 140 0 1335 4 100 -34.0 -37.0 4.0
mA dBm dB nm nm mA dBm dBm dB
89.3 -2.55 13.03 1320 1.7 76.1 -38.52 -42.33 2.2
76 -3.03 10.68 1317 1.4 75.1 -39.00 -43.40 2.0
101 -1.82 14.9 1324 2.2 82.1 -37.00 -40.00 2.3
4
Receiver and Transmitter power supply noise immunity Using the MSA power supply filter shown in Figure 1, noise of varying amplitude and frequency was injected onto the Rx VCC and receiver sensitivity monitored. The worst case receiver noise immunity observed was 200 mV pk-pk for 1 dB degradation in sensitivity. The transmitter worst case immunity occurred at 1 MHz. At this frequency a 164 mV pk-pk sinusoid signal on the VCC rail reduces the data output eye mask margin to 20%. Figure 2 shows the transmitter's noise rejection performance as a function of frequency.
1.2 1.1 1 0.9
Supply Noise Voltage (V)
0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 10kHz 100kHz 100Hz 1MHz 1kHz 10Hz
Frequency
Figure 2. Tolerable Transmitter Injected Power Supply Noise versus Frequency with MSA Power Supply Filter
5
Eye Diagram Typical filtered output eye diagrams for the HFCT-5915E at 0C, +25C and +70C and 3.3 V are displayed in Figure 3. The eye mask was measured through a filter as defined by the SONET/SDH recommendation and is compared to the standard's output eye diagram mask. Figure 4 shows typical unfiltered eye responses and transmitter optical output spectral plots at 0C, +25C and +70C for the HFCT-5915E.
(a)
(b)
(c)
Figure 3. HFCT-5915E Filtered Output Eye Diagram at (a) 0C, (b) +25C (c) +70C and 3.3 V.
6
(a)
(b)
(c)
Figure 4. HFCT-5915E Unfiltered Output Eye Diagram and Spectra at (a) 0C, (b) +25C (c) +70C at nominal supply voltage 3.3 V.
7
Transmitter Jitter Generation 2 HFCT-5915E modules were tested over temperature and voltage using a 2E23-1 PRBS pattern and measuring jitter on an Agilent 83480A Digital Communications Analyzer. Table 5 shows that HFCT-5915E meets and exceeds the SONET/SDH specification. Conclusions The results of this characterization exercise show that the HFCT-5915E meets all performance requirements.
Table 5 - HFCT-5915E Mean, Minimum and Maximum measured Transmitter Jitter over temperature and voltage
Test Parameters Jitter (pk - pk) Jitter (rms)
Units mUI mUI
Mean 34.96 5.83
Min. 27.68 4.52
Max. 49 7.7
Limits Min. Max. 100 10
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Data subject to change. Copyright (c) 2000 Agilent Technologies, Inc. 5980-1538E (06/00)

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