6
Notes:
1. This is the maximum voltage that can be applied across the Dierential Transmitter Data Inputs to prevent damage to the input ESD
protection circuit.
2. The outputs are terminated with 50 Ω connected to V
CC
–2 V.
3. The power supply current needed to operate the transmitter is provided to dierential ECL circuitry. This circuitry maintains a nearly constant
current ow from the power supply. Constant current operation helps to prevent unwanted electrical noise from being generated and
conducted or emitted to neighboring circuitry.
4. This value is measured with the outputs terminated into 50 Ω connected to V
CC
–2 V and an Input Optical Power Level of –14.5 dBm average.
5. The power dissipation value is the power dissipated in the receiver itself. Power dissipation is calculated as the sum of the products of supply
voltage and currents, minus the sum of the products of the output voltages and currents.
6. This value is measured with respect to V
CC
with the output terminated into
50 Ω connected to V
CC
–2 V.
7. The output rise time and fall times are measured between 20% and 80% levels with the output connected to V
CC
– 2 V through 50 Ω.
8. Eye-width specied denes the minimum clock time-position range, centered around the center of the 5 ns baud interval, at which the BER
must be 10
–12
or better. Test data pattern is PRBS 2
7
–1. The maximum change in input optical power to open the eye to 1.4 nsec from
a closed eye is 1.0 dB.
9. These optical power values are measured with the following conditions:
• The Beginning of Life (BOL) to the End of Life (EOL) optical power degradation is assumed to be 1.5 dB per the industry convention for
long wavelength LEDs. The actual degradation observed in normal commercial environments will be <1.0 dB with Avago’s 1300 nm LED
products.
• Over the specied operating voltage and temperature ranges.
• Input Signal: 2
7
–1 data pattern PseudoRandom Bit-Stream, 200 Mbit/sec NRZ code.
10. Input conditions: 100 MHz, square wave signal, input voltages are in the range specied for V
IL
and V
IH
.
11. From an assumed Gaussian-shaped wavelength distribution, the relationship between FWHM and RMS values for Spectral Width is 2.35 x
RMS = FWHM.
12. Measured with electrical input signal rise and fall time of 0.35 to 1.3 ns (20-80%) at the transmitter input pins. Optical output rise and fall
times are measured between 20% and 80% levels.
13. Transmitter Systematic Jitter is equal to the sum of Duty Cycle Distortion (DCD) and Data Dependent Jitter (DDJ). DCD is equivalent to Pulse-
Width Distortion (PWD). Systematic Jitter is measured at the 50% signal level with 200 MBd, PRBS 2
7
–1 electrical input data pattern.
14. This specication is intended to indicate the performance of the receiver section of the transceiver when Input Optical Power signal
characteristics are present per the following conditions. The Input Optical Power dynamic range from the minimum level (with a window
time-width) to the maximum level is the range over which the receiver is guaranteed to provide output data with a Bit Error Ratio (BER)
better than or equal to 10
–15
.
• At the Beginning of Life (BOL).
• Over the specied operating temperature and voltage ranges.
• Receiver data window time-width is 1.4 ns or greater and centered at mid-symbol.
• Input signal is 200 MBd, PseudoRandom-Bit-Stream 2
7
–1 data pattern.
• Transmitter cross-talk eects have been included in Receiver sensitivity. Transmitter should be running at 50% duty cycle (nominal)
between 8 - 200 Mbps, while Receiver sensitivity is measured.
15. All conditions of note 14 apply except that the measurement is made at the center of the symbol with no window time-width.
16. The receiver systematic jitter specication applies to optical powers between –14.5 dBm avg. to –27.0 dBm avg. at the receiver. Receiver
Systematic Jitter is equal to the sum of Duty Cycle Distortion (DCD) and Data Dependent Jitter (DDJ). DCD is equivalent to Pulse-Width
Distortion (PWD). Systematic Jitter is measured at the 50% signal level with 200 MBd, PRBS 2
7
–1 electrical output data pattern.
17. Status Flag switching thresholds: Direction of decreasing optical power If Power >–36.0 dBm avg., then SF = 1 (high)
If Power <–45.0 dBm avg., then SF = 0 (low)
Direction of increasing optical power:
If Power <–45.5 dBm avg., then SF = 0 (low)
If Power >–35.5 dBm avg., then SF = 1 (high)
18. Status Flag Hysteresis is the dierence in low-to-high and high-to-low switching thresholds. Thresholds must lie within optical power limits
specied. The Hysteresis is desired to avoid Status Flag chatter when the optical input is near the threshold.
19. The Status Flag output shall be asserted with 500 µs after a step increase of the Input Optical Power. The step will be from a low Input Optical
Power <–45.5 dBm avg., to >–35.5 dBm avg.
20. Status Flag output shall be de-asserted within 500 µs after a step decrease in the Input Optical Power. The Step will be from a high Input
Optical Power >–36.0 dBm avg. to <–45.0 dBm avg.
21. This value is measured with an output load of R
L
= 10 kΩ.
22. The Extinction Ratio is a measure of the modulation depth of the optical signal. The data “0” output optical power is compared to the data “1”
peak output optical and expressed in decibels. With the transmitter driven by a HALT Line State (12.5 Mhz square-wave) signal, the average
optical power is measured. The data “1” peak power is then calculated by adding 3 dB to the measured average optical power. The data “0”
output optical power is found by measuring the optical power when the transmitter is driven by a logic “0” input. The Extinction Ratio is the
ratio of the optical power at the “0” level compared to the optical power at the “1” level expressed in decibels.
