Ascent Communication Technology

2.5G SFP 1310nm 20km

The SFP 2.5Gb/s 1310nm LX transceiver is a compact, high-performance optical module designed for up to 20 km transmission over single-mode fiber (SMF). Supporting data rates up to 2.5 Gb/s, it is ideal for telecom and enterprise applications such as SDH/STM-16, SONET OC-48, and Fiber Channel links. The hot-pluggable SFP form factor ensures easy deployment and flexibility across a wide range of networking platforms. The module utilizes a reliable 1310 nm DFB laser transmitter and a high-sensitivity receiver, providing stable optical performance for medium-reach applications. The optical interface features a duplex LC connector, while the module operates on a standard +3.3V power supply. With low power consumption typically below 1.5W, it offers an efficient and cost-effective solution for 2.5G optical communication. Fully compliant with SFF-8472 digital diagnostic monitoring (DDM), the transceiver enables real-time monitoring of key operating parameters including temperature, voltage, and optical power. Designed for robust operation, it supports both commercial (0°C to 70°C) and industrial (-40°C to 85°C) temperature ranges, and is RoHS compliant and lead-free, making it suitable for carrier-grade and industrial networking environments.

· Up to 2.5Gb/s Data Links

· Hot-Pluggable

· 1310nm DFB laser transmitter

· Duplex LC connector

· Up to 20 km on 9/125pm SMF

· Single +3.3V Power Supply

· Monitoring Interface Compliant with SFF-8472

· Low power consumption<1.5W typically

· Operating temperature range:

Commercial: 0°C to 70°C

Industrial: -40°C to 85°C

· RoHS compliant and Lead Free

Absolute Maximum Ratings

Parameter	Symbol	Min.	Max.	Unit
Storage Temperature	T_s	-40	+85	°C
Maximum Supply Voltage	V_cc	-0.5	4.0	V
Operating Relative Humidity	RH	0	85	%

Recommended Operating Conditions

Parameter

Operating Case Temperature

Symbol

T_c

Min.

Typ.

Max.

+70

Unit

°C

Note

SFP-2G-LP-31-20

-40

+85

°C

SFP-2G-LP-31-20A

Optical Characteristics

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Transmitter
Center Wavelength	λ_c	1290	1310	1330	nm	1
Spectral Width(-20dB)	σ			1	nm
Side Mode Suppression Ratio	SMSR	30			dB
Optical Output Power	P_out	-9		-3	dBm	2
Optical Rise/Fall Time	tr / tf			260	ps	3
Extinction Ratio	ER	8.2			dB
Total Generated Transmitter Jitter (Peak to Peak)	J_TXp-p			0.07	UI	4
Total Generated Transmitter Jitter (rms)	J_TXrms			0.007	UI	4
Eye Mask for Optical Output	Compliant with IEEE802.3 (class 1 laser safety)
Receiver
Optical Input Wavelength	λ_c	1100		1600	nm
Optical Input Power	P_in	-24		-1	dBm	5,6
Receiver Overload	P_ol	-3			dBm	5,6
RX Sensitivity	Sen			-24	dBm	5,6
Receiver Reflectance		12			dB
RX_LOS Assert	LOS_A	-40			dBm
RX_LOS Deassert	LOS_D			-25	dBm
RX_LOS Hysteresis	LOS_H	0.5	2	6	dB
General Characteristics
Data Rate	BR		2500	2700	Mb/s
Bit Error Rate	BER			10^-12
Max. Supported Link Length on 9/125μm SMF@2.5G	LMAX			20	km	7,8
Total System Budget	LB	16			dB	7,8

Note:

1. Also specified to meet curves in FC-PI 13.0 Figures 18 and 19, which allow trade-off between wavelength spectral widths.

2. Class 1 Laser Safety per FDA/CDRH and EN (IEC) 60825 regulations.

3. Unfiltered 20-80%. Complies with IEEE 802.3 (Gig. E), FC 1x and 2x eye masks when filtered.

4. Measured with DJ-free data input signal. In actual application, output DJ will bethe sum of input DJ and .DJ.

5. Measured with conformance signals defined in FC-PI 13.0 specifications.

6. Measured with PRBS 2^23-1 at 10^-12 BER.

7. Dispersion limited per FC-PI Rev.13.

8. Attenuation of 0.25dB/km is used for the link length calculations. Distances are indicative only. Please refer to the Optical Specifications in Table IV to calculate a more accurate link budget based on specific
conditions in your application.

Electrical Characteristics (Top = Tc, Vcc = 3.135 to 3.465 Volts)

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Supply Voltage	V_cc	3.14	3.30	3.47	V
Supply Current	I_cc			300	mA
Inrush Current	I_surge			I_cc+30	mA
Maximum Power	P_max			1.0	W
Transmitter
Input Differential Impedance	R_in	90	100	110
Single Ended Data Input Swing	V_{in PP}	200		1200	mVp-p
Transmit Disable Voltage	V_D	V_cc-1.3		V_cc	V	1
Transmit Enable Voltage	V_EN	V_ee		V_ee+0.8	V
Transmit Disable Assert Time	T_dessert			10	us
Receiver
Single Ended Data Output Swing	V_out,pp	300		1000	mv	2
Data Output Rise Time	t_r			260	ps
Data Output Fall Time	t_f			260	ps
LOS Fault	V_losfault	V_cc-0.5		V_{CC_host}	V	3
LOS Normal	V_{los norm}	V_ee		V_ee+0.5	V	3
Power Supply Rejection	PSR	100			mVpp
Total Generated Transmitter Jitter(Peak to Peak) Contribution	JRXp-p			0.07	UI
Total Generated Transmitter Jitter(Rms)	JRXrms			0.007	UI