Ascent Communication Technology

GPON OLT SFP 2.5G Class C++ 20 km

ASCENT’s GPON OLT transceiver SFP-GG-SP-4931 C++ is designed for optical line terminal (OLT) for ITU-T G.984.2 Class C++ requirements Network transmission. The optical transceiver is compliant with the Small Form- Factor Pluggable (SFP) Multi-Source Agreement (MSA).

• Support ITU-T G.984.2 GPON OLT C++ application

• Single fiber bi-directional data links with symmetric 2.488Gbps Tx and 1.244Gbps Rx

• 1490 nm continuous-mode transmitter with DFB LD

• 1310 nm burst-mode receiver with APD-TIA

• 2-wire interface for integrated digital diagnostic Monitoring

• Receiver RESET, Signal Detect, RSSI function indication (RESET, RX_SD, RSSI)

• SFP package with SC/UPC receptacle optical interface

• Single +3.3 V power supply

• Operation case temperature 0 to 70°C

• RoHS6 compliance

Operating Condition

Parameter	Unit	Min.	Typical	Max.
Storage Temperature	°C	‑40		85
Operating Case Temp for C‑temp	°C	0		70
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.	Typ.	Max.	Notes
Transmitter
TX Central Wavelength	nm	1480	1490	1500
Spectral Width (‑20dB)	nm			1
Side Mode Suppression Ratio (SMSR)	dB	30
Mean Launched Power	dBm	4.5		10
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		Compliant With ITU‑T G.984.2			1
Receiver
Receive Wavelength	nm	1290	1310	1330
Sensitivity	dBm			‑30	2
Overload	dBm	‑12			2
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