Ascent Communication Technology

25G SFP28 CWDM 10 km(E)

ASCENT’s SFP28 25Gbps CWDM EML Transceiver is a high-performance optical module designed for 10km reach applications supporting data rates from 24.33Gb/s to 25.78Gb/s. Operating over CWDM wavelengths from C47 to C61 on single-mode fiber, it meets the needs of next-generation data center interconnects, 5G fronthaul, and high-speed enterprise networking environments. This compact hot-pluggable SFP28 module is built to comply with industry standards including SFP28 MSA, SFF-8431, and SFF-8432, and is available in industrial temperature ranges to meet diverse environmental demands. With a low-power 3.3V DC power supply, it helps reduce overall power consumption in dense network infrastructures. The optical assembly features a C47 to C67 EML laser transmitter and a PIN photodiode receiver integrated with a TIA, ensuring low jitter and exceptional bit error rate performance. Engineered for cost-effectiveness, energy efficiency, and long-term reliability, this transceiver is ideal for customers seeking to maximize performance while minimizing operational costs.

· Operating data rate up to 25.78Gbps

· Up to 10km(PIN)transmission distance

· CWDM EML Laser and PIN receiver

· LC duplex connector

· Hot pluggable 20pin connector

· Low power consumption

Commercial<2W

Industrial<2.3W

· Single +3.3V±5% power supply

· Compliant with SFF-8472

· Fully RoHS Compliant

· Case operating temperature

Commercial: 0°C to +70°C

Industrial: -40°C to +85°C

Absolute Maximum Ratings

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Storage Temperature	Ts	-40		85	°C
Relative Humidity	RH	0		95	%
Maximum Supply Voltage	Vcc	-0.5		4.0	V

Recommended Operating Conditions

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Power Supply Voltage	V_CC	3.14	3.3	3.46	V
Bit Rate	BR		25.78		Gb/s
Bit Error Ratio	BER			5*10-5

Optical Characteristics (Tc=0 to 70°C or -40 to 85°C and Vcc= 3.14 to 3.46V)

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Transmitter
Nominal Wavelength	λ	1471,1491,1511,1531,1551,1571,1591,1611			nm
Wavelength Drift	Δλ	-6.5		+6.5	nm
Average Output Power	Pav	-3		6	dBm
Spectral Width (-20dB)	s			1	nm
Extinction Ratio	ER	6			dB
Side Mode Suppression Ratio	SMSR	30			dB
Transmitter and Dispersion Penalty	TDP			4	dB
Average Launch Power of OFF Transmitter	POFF			-30	dBm
Relative Intensity Noise	RIN			-128	dB/Hz
Receiver (Pin/TIA)
Center Wavelength	λ_C	1260		1620	nm
Receiver Sensitivity(OMA)	RSENSE			-14.5	dBm	1
Receiver Overload (OMA)	Pmax	2			dBm
Optical Return Loss				-26	dB
LOS Assert	LOSA	-30			dBm
LOS De-Assert LOS	LOSD			-17	dBm
LOS Hysteresis		0.5			dB

Note: Measured at 25.78125Gb/s, ER>=6dBm, PRBS 2³¹-1 and BER better than or equal to 5E-5.

Electric Ports Definition

Parameter	Symbol	Min	Typ.	Max	Unit	Note
Supply Voltage	VCC	3.14	3.3	3.46	V
Power Consumption	P			2300	mW	I-temp
				2000		C-temp
Transmitter
Input Differential Impedance	RIN		100		Ω
Single-ended Data Input Swing	VIN	90		450	mVp-p
Transmit Disable Voltage	VDIS	2		VCCHOST	V
Transmit Enable Voltage	VEN	VEE		VEE+0.8	V
Transmit Fault Assert Voltage	VFA	2		VCCHOST	V
Transmit Fault De-Assert Voltage	VFDA	VEE		VEE+0.4	V
Receiver
Single-ended Data Output Swing	VOD	200		450	mVp-p
LOS Fault	VLOSFT	2		VCCHOST	V
LOS Normal	VLOSNR	VEE		VEE+0.4	V

Digital Diagnostic Monitor Accuracy

Parameter	Accuracy	Unit
Internally Measured Transceiver Temperature	+/-3	°C
Internally Measured Transceiver Supply Voltage	+/-3	%
Measured Tx Bias Current	+/-10	%
Measured Tx Output Power	+/-3	dB
Measured Rx Received Average Optical Power	+/-3	dB