GPON OLT Optical Transceiver SFP Module Class C + 2.488G downstream
1.244G upstream
The GPON OLT Transceiver is designed for Gigabit-capable Passive
Optical Network(GPON)transmission. The module incorporates 1490nm
DFB continuous-mode transmitter and 1310nm burst-mode APD receiver.
The transmitter section uses a high efficiency 1490nm DFB laser and
an integrated laser driver which is designed to be class-1 eye
safety under any single fault. The laser driver includes APC and
temperature compensation functions, which are used for keeping the
launch optical power and extinction ratio constant over temperature
and aging.
The receiver section uses an integrated APD detector and burst mode
preamplifier mounted together. To provide fast settling time with
immunity to long streams of Consecutive Identical Digits(CID), the
receiver requires a reset signal provided by the media access
controller(MAC). The receiver has fast SD function, the rising time
is about 5ns, when reset signal arrived, the SD signal will be
turned to low, and the noise in the guard time will be squelched.
The receiver includes digitalized burst mode optical power
monitoring function, which converses any of a received ONU optical
power directly in digital, with a Trigger input from system. When
rising edge of Trigger detected, the DDM processor starts a burst
optical power conversion, the digital result is available via DDM
interface after Burst Optical Power Conversion Time. Trigger pulse
width should be more than Burst Optical Power Conversion Holding
Time.
An integrated WDM coupler can distinguish 1310nm input light from
1490nm output light.
The metallic package guarantees excellent EMI and EMC
characteristics, which totally comply with international relevant
standards.
Application
GPON OLT Class C+
FTTx
Operating Condition
| Parameter | Unit | Min. | Typical | Max. |
| Storage Temperature | °C | -40 | | 85 |
| Operating Case Temp for C-temp | °C | 0 | | 70 |
| Operating Case Temp for I-temp | °C | -40 | | 85 |
| Operating Relative Humidity | % | 5 | | 95 |
| Power Supply Voltage | V | 3.15 | 3.3 | 3.45 |
| Supply Current | mA | | | 600 |
| Bit Rate for Tx | Gbps | 2.488 |
| Bit Rate for Rx | Gbps | 1.244 |
Characteristics
All performance is specified at whole working temperature and
conditions
| Parameter | Unit | Min. | Typical | Max. |
| Transmitter |
| TX Central Wavelength | nm | 1480 | 1490 | 1500 |
| Spectral Width (-20dB) | nm | | | 1 |
| Side Mode Suppression Ratio (SMSR) | dB | 30 | | |
| Mean Launched Power | dBm | 3 | | 7 |
| Mean Launched Power (TX Off) | dBm | | | -45 |
| Extinction Ratio | dB | 8.2 | | |
| Optical Return Loss Tolerance | dB | -12 | | |
| Transmitter and dispersion Penalty | dB | | | 1 |
| Transmitter Mask(PRBS223-1@2.488G) | Compliant With ITU-T G.984.2 |
| Receiver |
| Receive Wavelength | nm | 1290 | 1310 | 1330 |
Sensitivity (PRBS223-1@1.244G,ER=10,BER<10-10) | dBm | | | -30 |
Overload (PRBS223-1@1.244G,ER=10,BER<10-10) | dBm | -12 | | |
| Receiver Burst Mode Dynamic Range | dB | 15 | | |
| Damage Threshold for Receiver | dBm | 5 | | |
| SD Assert Level | dBm | | | -33 |
| SD De-assert Level | dBm | -45 | | |
| SD Hysteresis | dB | 0.5 | | 6 |
| WDM Filter isolation to 1550nm | dB | 38 | | |
| WDM Filter isolation to 1650nm | dB | 35 | | |
| Electrical Interface Characteristics |
| Data Input Swing Differential/TX | mV | 200 | - | 2000 |
| Data Output Swing Differential/RX | mV | 400 | | 1600 |
| Date Differential Impedance | Ω | 90 | 100 | 110 |
| LVTTL Output High | V | 2.4 | | Vcc |
| LVTTL Output Low | V | 0 | | 0.4 |
| LVTTL Input High | V | 2.0 | | Vcc+0.3 |
| LVTTL Input Low | V | 0 | | 0.8 |
| Timing Characteristics |
| Guard Time (Tg) | ns | 25.6 | | |
| Reset Pulse Width (Tr) | ns | | | 12.8 |
| Reset Delay (Trd) | ns | | | 12.8 |
| Receiver Preamble Time (Tp) | ns | | | 140 |
| SD Assert Time (TSDA) | ns | | | 100 |
| SD De-assert Time (TSDD) | ns | | | 12.8 |
| RSSI Trigger Delay (Ttd) | ns | 25 | | |
| RSSI Trigger Pulse Width (Tw) | ns | 500 | | |
| Internal I2C Delay (Twait) | us | | | 500 |
