Ascent Communication Technology

1.25G SFP 1550 nm 160 km

ASCENT’s SFP-AG-LP-51-160 Small Form Factor Pluggable (SFP) transceivers are flexible solution as an interface for switches, routers, servers, and other optical links. They are compatible with the Small Form Factor Pluggable Multi-Sourcing Agreement (MSA). The transceiver consists of five sections: the LD driver, the limiting amplifier, the digital diagnostic monitor, the DFB laser and the PIN photo-detector. The module data link up to 160 km in 9/125 μm single mode fiber. The optical output can be disabled by a TTL logic high-level input of Tx Disable, and the system also can disable the module via I2C. Tx Fault is provided to indicate that degradation of the laser. Loss of signal (LOS) output is provided to indicate the loss of an input optical signal of receiver or the link status with partner. The system can also get the LOS (or Link)/Disable/Fault information via I2C register access.

· Operating Data Rate up to 1.25Gbps

· 1550nm DFB Laser Transmitter

· 160km with 9/125 µm SMF

· Single 3.3V Power Supply

· Hot-Pluggable SFP Footprint Duplex LC Connector Interface

· Class 1 FDA and IEC60825-1 Laser Safety Compliant

· Operating Temperature: Standard: 0°C to +70°C, Industrial: -40°C to +85°C

· Applications: Gigabit Ethernet Switches and Routers, Fiber Channel Switch Infrastructure, STM-4 and other optical links

· Compliant with MSA SFP Specification

· Compliant with SFF-8472

· ROHS 2.0 compatible

Absolute Maximum Ratings

Parameter	Symbol	Min.	Max.	Unit
Storage Temperature	T_S	-40	+85	°C
Maximum Supply Voltage	V_CC	-0.5	3.6	V
Operating Relative Humidity	RH		95	%

Notes:

1. Exceeding any one of these values may destroy the device immediately.

Recommended Operating Conditions

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Operating Case Temperature	T_c	0		+70	°C	SFP-AG-LP-51-160
Operating Case Temperature	T_c	-40		+85	°C	SFP-AGLP-51-160A
Power Supply Voltage	V_CC	3.15	3.3	3.45	V
Power Supply Current	ICC			300	mA
Data Rate	GBE		1.25		Gbps
Data Rate	FC		1.063		Gbps

Electrical Characteristics

Parameter		Symbol	Min.	Typ.	Max.	Unit	Note
Transmitter
LVPECL Inputs (Differential)		Vin	500		2400	mVpp	AC Coupled Inputs*(Note1)
Input Impedance (Differential)		Zin	85	100	115	ohms	Rin > 100 kohms @ DC
TX_Dis	Disable		2		Vcc	V
TX_Dis	Enable		0		0.8	V
TX_FAULT	Fault		2		Vcc+0.3	V
TX_FAULT	Normal		0		0.5	V
Receiver
LVPECL Outputs (Differential)		Vout	370		2000	mVpp	AC Coupled Outputs*(Note1)
Output Impedance (Differential)		Zout	85	100	115	ohms
TX_Disable Assert Time		t_off			10	us
RX_LOS	LOS		2		Vcc+0.3	V
	Normal		0		0.8	V
MOD_DEF (0.2)		VoH	2.5			V	With Serial ID
MOD_DEF (0.2)		VoL	0		0.5	V	With Serial ID

Notes:

1. LVPECL logic, internally AC coupled.

Optical Characteristics

Parameter	Symbol	Min.	Typ.	Max.	Unit
9µm Core Diameter SMF	L		160		km
Data Rate			1.063/1.25		Gbps
Transmitter
Center Wavelength	λ_C	1500	1550	1580	nm
Spectral Width (-20dB)	∆λ			1	nm
Side Mode Suppression Ratio	SMSR	30			dB
Average Output Power* ^(Note1)	Pout	+3		+7	dBm
Extinction Ratio*(Note2)	ER	9			dB
Rise/Fall Time (20% to 80%)	tr/tf			0.26	ns
Total Jitter*(Note2)	TJ			0.43	UI
Output Optical Eye	Compliant with IEEE 802.3
Pout@TX Disable Asserted	Pout			-45	dBm
Receiver
Center Wavelength	λC	1260		1600	nm
Receiver Sensitivity*^(Note3)	Pmin			-34	dBm
Receiver Overload	Pmax	-10			dBm
LOS De-Assert	LOSD			-38	dBm
LOS Assert	LOSA	-45			dBm
LOS Hysteresis		0.5			dB

Notes:

1. Output power is measured by coupling into a 9/125 mm multi-mode fiber.

2. Filtered, measured with a PRBS 2⁷-1 test pattern @1250Mbps.

3. Minimum average optical power is measured at BER less than 1E-12, with 2^7-1 PRBS and ER=9 dB

Digital Diagnostic Functions

Parameter	Range	Unit	Accuracy	Calibration
Temperature	-40 to 85	°C	±3°C	Internal / External
Voltage	3.0 to 3.6	V	±3%	Internal / External
Bias Current	10 to 80	mA	±10%	Internal / External
TX Power	3 to 7	dBm	±3dB	Internal / External
RX Power	-34 to -10	dBm	±3dB	Internal / External