Ascent Communication Technology

1.25G SFP 1310 nm 10 km

ASCENT’s SFP-AG-LP-31-10 Small Form Factor Pluggable (SFP) transceivers 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 1310nm FP laser and the PIN/TIA. The module data link up to 20 km in 9/125 µm Single-mode fiber. This transceiver meets the Small Form Pluggable (SFP) industry standard package utilizing an integral LC-Duplex optical interface connector. An enhanced Digital Diagnostic Monitoring Interface compliant with SFF-8472 has been incorporated into the transceiver. It allows real time access to the transceiver operating parameters such as transceiver temperature, laser bias current, transmitted optical power, and received optical power and transceiver supply voltage by reading a built-in memory with I2C interface. The optical output can be disabled by a LVTTL logic highlevel 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.

• Up to 1.25 Gb/s data links

• FP laser transmitter and PIN photo-detector

• Up to 10(20) km on 9/125 µm SMF

• Hot-pluggable SFP footprint

• Duplex LC/UPC type pluggable optical interface

• Low power dissipation

• Metal enclosure, for lower EMI

• RoHS compliant and lead-free

• Single +3.3 V power supply

• Supports Digital Diagnostic Monitoring interface

• Compliant with SFF-8472 and IEEE802.3z

• Switch to Switch Interface

• Gigabit Ethernet

• Switched Backplane Applications

• Router/Server Interface

• Other Optical Links

Absolute Maximum Ratings

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Storage Temperature	T_S	-40		85	°C
Storage Ambient Relative Humidity	HA	0		85	%
Power Supply Voltage	V_CC	-0.5		4	V
Signal Input Voltage		-0.3		Vcc+0.3	V
Receiver Damage Threshold		+3			dBm
Lead Soldering Temperature/Time	T_SOLD			260/10	°C/sec	1
Lead Soldering Temperature/Time	T_SOLD			360/10	°C/sec	2

Notes:

1. Suitable for wave soldering.

2. Only for soldering by iron.

Recommended Operating Conditions

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Case Operating Temperature	Tcase	0		+70	°C	Commercial
		-40		+85	°C	Industrial
Ambient Humidity	HA	5		70	%	Non-condensing
Power Supply Voltage	V_CC	3.13	3.3	3.47	V
Power Supply Current	Icc			280	mA
Data Rate			1250/1250		Mbps	TX rate/RX rate
Transmission Distance				20	km
Coupled Fiber	Single-mode fiber

Specification of Transmitter

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Average Output Power	P_OUT	-9		-3	dBm
Extinction Ratio	ER	9			dB
Center Wavelength	λ_C	1260	1310	1360	nm
Spectrum Bandwidth (RMS)	σ			3.5	nm	FP Laser
Transmitter OFF Output Power	P_Off			-45	dBm
Jitter p-p	t_J			0.1	UI	1
Output Eye Mask	Compliant with IEEE802.3z (class 1 laser safety)					2

Notes:

1. Measure at 2⁷-1 NRZ PRBS pattern.

2. Transmitter eye mask definition.

Specification of Receiver

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Input Optical Wavelength	λIN	1270		1610	nm
Receiver Sensitivity	PIN			-24	dBm	1
Input Saturation Power (Overload)	PSAT	-3			dBm
Loss of Signal Assert	PA	-45			dBm
Loss of Signal De-assert	PD			-24.5	dBm	2
LOS Hysteresis	PD-PA	0.5		6	dB

Notes:

1. Measured with light source 1310 nm, ER = 9 dB; BER ≤ 10-12 @ PRBS = 27-1 NRZ

2. When LOS De-asserted, the RX data± output is signal output.

Digital Diagnostic Memory Map

Digital Diagnostic Monitoring Information

Parameter	Unit	Accuracy
Case Temperature	°C	±3
Supply Voltage	V	±3%
Tx Bias Current	mA	±10%
Tx Optical Power	dB	±3
Rx Optical Power	dB	±3

Electrical Interface Characteristics

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Transmitter
Total Supply Current	I_CC			A	mA	1
Transmitter Disable Input-High	V_DISH	2		Vcc+0.3	V	LVTTL
Transmitter Disable Input-Low	V_DISL	0		0.8	V	LVTTL
Transmitter Fault Input-High	V_TxFH	2		Vcc+0.3	V	LVTTL
Transmitter Fault Input-Low	V_TxFL	0		0.8	V	LVTTL
Receiver
Total Supply Current	I_CC			B	mA	1
LOS Output Voltage-High	V_LOSH	2		Vcc+0.3	V	LVTTL
LOS Output Voltage-Low	V_LOSL	0		0.8	V	LVTTL