Ascent Communication Technology

SFP GPON OLT D+ Transceiver

ASCENT’s GPON OLT transceiver SFP-GG-SP-4931 D+ is designed for optical line terminal (OLT) for ITU-T G.984.2 Class D+ requirements Network transmission. The optical transceiver is compliant with the Small Form- Factor Pluggable (SFP) Multi-Source Agreement (MSA). The GPON OLT SFP module is contained in a SFP package with SC/UPC receptacle connector. The module consists of 1490nm DFB laser, InGaAs APD, Preamplifier and WDM filter in a high-integrated optical sub-assembly, and it transmits up to 2.5Gbps of continuous data at 1490nm and receives 1.25Gbps burst-mode data at 1310nm. The module data links up to 20km in 9/125um single mode fiber. Ascent GPON SFP is a low-cost point to multi point (P2MP) Fiber to the Home, Business or Curb (FTTX) GPON OLT transceiver. It is fabricated with a rugged die cast metal housing and cage assembly. Commercial and industrial temperature ranges are available. It is IEC 60825-1 Class I laser safety compliant and meets the EEC Directive 2002/95/EC for RoHS compliance.

· ITU-T G.984.2 GPON OLT D+

· Bi-directional 2.5Gbps Tx and 1.25Gbps Rx

· 1490nm continuous-mode transmitter with DFB LD

· 1310nm burst-mode receiver with APD-TIA

· Digital diagnostic monitoring

· SFP package with SC/UPC receptacle optical interface

· Single +3.3V power supply

· Operation case temperature

-40 to 85°C

· RoHS6 compliance

Absolute Maximum Ratings

Parameter	Symbol	Min.	Max.	Unit	Note
Storage Temperature	T_stG	-40	85	°C
Operating Case Temperature	T_c	0	70	°C
Operating Humidity	OH	5	95	%
Power Supply Voltage	V_CC	0	3.6	V
Receiver Damage Threshold		+5		dBm

Recommended Operating Conditions

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Power Supply Voltage	V_CC	3.13	3.3	3.47	V
Power Supply Current			350	500	mA
Operating Case Temperature	Tc	0		70	°C
Operating Humidity Range	OH_o	5		85	%
Nominal Data Rate			Tx 1244.16 Rx 2488.32		Mbit/s

Transmitter Optical Specifications

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Optical Center Wavelength		1480		1500	nm
Optical Spectrum Width (-20dB)	∆λ			1	nm
Side Mode Suppression Ratio	SMSR	30			dB
Average Launch Optical Power	AOP	+6		+10	dBm	EOL, 0~70°C
Power-OFF Transmitter Optical Power				-39	dBm	Launched into SMF
Extinction Ratio	ER	8.2			dB	PRBS2²³-1+72CID @2.488Gbit/s
Tolerance to Transmitter Incident Light		-15			dB
Transmitter Reflectance				-10	dB
Transmitter and Dispersion Penalty	TDP			1	dB	Transmit on 20km SMF
Optical Waveform Diagram	ITU-T G.984.2					Figure 1,margin>5%
Output Eye Mask	Compliant with ITU5T G.984.2 Mask

Transmitter Electrical Characteristics

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Data Input Differential Swing		600		1600	mV	LVPECL input, AC coupled
Input Differential Impedance		90	100	110	Ω
Transmitter Disable Voltage - Low		0		0.8	V
Transmitter Disable Voltage - High		2.0		V_CC	V
Transmitter Fault Alarm Voltage - Low		0		0.4	V
Transmitter Fault Alarm Voltage - High		2.4		V_CC	V

Transmitter Eye Mask Definitions and Test Procedure

Receiver Optical Characteristics

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Operating Wavelength	SEN	1290		1330	nm
Sensitivity (EOL, 0~70°C)	SEN			-35	dBm	PRBS2²³- 1+72CID@1.244Gbps BER ≤1×10-4 ,ER≥10dB
Saturation Optical Power					dBm
Dynamic Range		15			dB	Figure 2
SD Signal Assert Level				-36	dBm
SD Signal De-assert Level		-45			dBm
Hysteresis		0.5		6	dB
Receiver Reflectance				12	dB

Burst Mode Receiver Dynamic Range in GPON System

Receiver Electrical Characteristics

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Data Output Voltage – Low		V_cc-1.81		V_cc-1.62	V
Data Output Voltage – High(-Vcc)		V_cc-1.02		V_cc-0.88	V
Data Output Differential Swing		400		1600	mV	LVPECL output, DC coupled
Reset with	TRESET	16			bits
Reset-Low		0		0.4	V
Reset- High		2.4		V_cc	V
Receiver Amplitude Recovery	TRECOVERY			32	bits	Refer to the Reset signal falling
Signal Detect Assert Time				50	ns
Signal Detect De-assert Time				12.8	ns	Refer to the Reset signal rising
Signal Detect Voltage-Low		0		0.4	V
Signal Detect Voltage- High		2.4		V_cc	V
RSSI Trigger-Low		0		0.8	V
RSSI Trigger- High		2.0		Vcc	V
Optical Signal During Time	T_ont	1200			ns
Data Output Voltage – Low		V_cc-1.81		V_cc-1.62	V
Data Output Voltage – High(-Vcc)		V_cc-1.02		V_cc-0.88	V
Data Output Differential Swing		400		1600	mV	LVPECL output, DC coupled
Reset with	TRESET	16			bits
Reset-Low		0		0.4	V
Reset- High		2.4		V_cc	V
Receiver Amplitude Recovery	TRECOVERY			32	bits	Refer to the Reset signal falling
Signal Detect Assert Time				50	ns
Signal Detect De-assert Time				12.8	ns	Refer to the Reset signal rising
Signal Detect Voltage-Low		0		0.4	V
Signal Detect Voltage- High		2.4		V_cc	V
RSSI Trigger-Low		0		0.8	V
RSSI Trigger- High		2.0		V_cc	V
Optical Signal During Time	T_ont	1200			ns
RSSI Trigger- High		2.0		V_cc	V
Optical Signal During Time	T_ont	1200			ns

Digital Diagnostic Monitoring

Parameter	Range	Accuracy	Calibration	Note
Temperature	0 to +70 °C	±3°C	Internal	1LSB = 1/256°C
Voltage	3.0 to 3.7 V	±3%	Internal	1LSB = 0.1mV
Bias Current	0 to 100 mA	±10%	Internal	1LSB = 2uA
TX Power	1.5 to 5 dBm	±2dB	Internal	1LSB = 0.1uW
RX Power Monitor	-30 to -8 dBm	±3dB	External	1LSB = 0.1uW