Ascent Communication Technology

1.25G SFP EZX 1550 nm 120 km

ASCENT’s SFP-AGLP-51-120 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 DFB laser and the APD .The module data link up to 120 km in 9/125 µm single mode fiber.

• Up to 1.25 Gb/s data links

• DFB laser transmitter and APD receiver

• Up to 120km 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 +3.3V power supply

• Compliant with SFF-8472

Absolute Maximum Ratings

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Storage Temperature	Ts	‑40		85	°C
Relative Humidity	RH	5		95	%
Power Supply Voltage	VCC	‑0.5		4	V
Signal Input Voltage		‑0.3		Vcc+0.3	V
Receiver Damage Threshold		5			dBm

Recommended Operating Conditions

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Case Operating Temperature	T_case	0		70	°C	SFP‑AG‑LP‑51‑120‑A
		‑10		80	°C	SFP‑AG‑LP‑51‑120‑AE
		‑40		85	°C	SFP‑AG‑LP‑51‑120‑AA
Power Supply Voltage	V_CC	3.13	3.3	3.47	V
Power Supply Current	I_CC			300	mA
Power Supply Noise Rejection				100	mVp‑p	100 Hz to 1 MHz
Data Rate			1250/1250		Mbps	TX Rate/RX Rate
Transmission Distance				120	km
Coupled Fiber	Single‑mode fiber					9/125 µm SMF

Transmitter Specifications

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Average Output Power	P_OUT	0		5	dBm	1
Extinction Ratio	ER	9			dB
Center Wavelength	λ_C	1530	1550	1570	nm	DFB Laser
Side Mode Suppression Ratio	SMSR	30			dB	DFB Laser
Spectrum Bandwidth(‑20dB)	σ			1	nm
Transmitter OFF Output Power	P_Off			‑45	dBm
Differential Line Input Impedance	RIN	90	100	110	Ω
Output Eye Mask	Compliant with IEEE802.3 z (class 1 laser safety)					2

Notes

1. Measure at 2^7‑1 NRZ PRBS pattern.

2. Transmitter eye mask definition.

Receiver Specifications

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Input Optical Wavelength	λ_IN	1270		1610	nm	APD
Receiver Sensitivity	P_IN			‑31	dBm	1
Input Saturation Power (Overload)	P_SAT	‑10			dBm
Loss Of Signal Assert	P_A			‑31	dBm
Loss Of Signal De‑assert	P_D	‑38			dBm	2
LOS Hysteresis	P_A‑P_D	0.5	2	6	dB

Notes

1. Measured with Light source 1550 nm, ER=9dB; BER =<10^‑12 @PRBS=2^7‑1 NRZ

2. When LOS de‑asserted, the RX data± output is High‑level (fixed)

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
Transmitter Disable Input‑Low	V_DISL	0		0.8	V
Transmitter Fault Input‑High	V_TxFH	2		Vcc+0.3	V
Transmitter Fault Input‑Low	V_TxFL	0		0.8	V
Receiver
Total Supply Current	I_CC			B	mA	1
LOSS Output Voltage‑High	V_LOSH	2		Vcc+0.3	V	LVTTL
LOSS Output Voltage‑Low	V_LOSL	0		0.8	V	LVTTL

Notes

1. A (TX) + B (RX) = 300mA (Not include termination circuit)

Regulatory Compliance

Feature	Reference	Performance
Electrostatic discharge(ESD)	IEC/EN 61000‑4‑2	Compatible with standards
Electromagnetic Interference (EMI)	FCC Part 15 Class B EN 55022 Class B (CISPR 22A)	Compatible with standards
Laser Eye Safety	FDA 21CFR 1040.10, 1040.11 IEC/EN 60825‑1, 2	Class 1 laser product
Component Recognition	IEC/EN 60950 , UL	Compatible with standards
ROHS	2002/95/EC	Compatible with standards
EMC	EN61000‑3	Compatible with standards