Ascent Communication Technology

100G QSFP28 CWDM4 1310 nm 2 km

Ascent’s QSFP28-100G-LP02 transceiver modules are designed for use in 100 Gigabit Ethernet links over single mode fiber. They are compliant with the QSFP28 MSA, CWDM4 MSA, IEEE 802.3ba and IEEE 802.3bm. They are suitable to be used in various applications, such as data centers, high-performance computing networks, enterprise core and distribution layer applications. The central wavelengths of the 4 CWDM channels are 1271, 1291, 1311 and 1331 nm. It contains a duplex LC connector for the optical interface and a 38-pin connector for the electrical interface. This product converts the 4- channel 25Gb/s electrical input data into CWDM optical signals (light), by a 4-wavelength Distributed Feedback Laser (DFB) TO. The 4 wavelengths are multiplexed into a single 100Gb/s data, propagating out of the transmitter module via the SMF. The receiver module accepts the 100Gb/s optical signals input, and de-multiplexes it into 4 CWDM 25Gb/s channels. Each wavelength light is collected by a discrete photo diode, and then outputted as electric data after amplified by a TIA. The product is designed with form factor, optical/electrical connection and digital diagnostic interface according to the QSFP28 Multi-Source Agreement (MSA). The optical transceiver is compliant per the RoHS Directive 2011/65/EU.

• Supports 103.1Gb/s aggregate bit rate

• 4x25Gb/s electrical interface

• 4X25Gb/s CWDM transmitter and PIN/TIA receiver

• Maximum link length of 2km on Single Mode Fiber (SMF)

• Hot-pluggable QSFP28 from factor

• Single 3.3V power supply

• Integrated 4-channel CWDM mux/Demux for duplex LC operation

• Duplex LC receptacles

• Maximum power dissipation<3.5W

• RoHS-6 compliant and lead-free

• I2C management interface

• Commercial operating temperature: 0°C to +70°C

Absolute Maximum Ratings

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Storage Temperature	T_s	-40	--	85	°C
Storage Ambient Relative Humidity	H_A	0	--	85	%
Maximum Supply Voltage	V_CC	-0.5	--	3.6	V
Lead Soldering Temperature/Time	TSOLD	--	--	260/10	°C /sec	1
Lead Soldering Temperature/Time	TSOLD	--	--	360/10	°C /sec	2

Note:
1. Suitable for wave soldering.
2. Only for soldering by iron.

Optical Characteristics

Parameter Transmitter(per lane)	Symbol	Min.	Typ.	Max.	Unit	Note
Signaling Speed per Lane		25.78125 ± 100 ppm			Gb/s	1
Center Wavelength	λ_C	--	1264.5 ~ 1277.5 1284.5 ~ 1297.5 1304.5 ~ 1317.5 1324.5 ~ 1337.5	--	nm
Extinction Ratio	ER	3.5	--	--	dB
Side Mode Suppression Ratio	SMSR	30	--	--	dB
Total Average Launch Power	Ptot	--	--	8.5	dBm
Average Launch Power, Each Lane	Po	-6.5	--	2.5	dBm
OMA, Each Lane	OMA	-4	--	2.5	dBm	CW,ER>3.5dB
Difference in Launch Power between Any Two Lanes (OMA)				5	dB
TDP, Each Lane	TDP			3.0	dB	2
Average Launch Power of OFF Transmitter, Each Lane	Poff			-30	dBm
Transmitter Eye Mask Definition {X1,X2,X3,Y1,Y2,Y3}		{0.31, 0.40, 0.45, 0.34, 0.38, 0.4}				3
Receiver(per lane)
Signaling Speed per Lane		25.78125 ± 100 ppm			Gb/s	4
Input Optical Wavelength	λIN		1264.5 ~ 1277.5 1284.5 ~ 1297.5 1304.5 ~ 1317.5 1324.5 ~ 1337.5		nm
Damage Threshold		3.5			dBm
Receiver Power (OMA), Each Lane		2.5			dBm
Rx Sensitivity(OMA) per Lane	RSENS			-10	dBm	5
Stressed Receiver Sensitivity (OMA), Each Lane	SRS			-7.3	dBm	6
Conditions of stressed receiver sensitivity test
Vertical Eye Closure Penalty, Each Lane	VECP	1.9		dB
Stressed Eye J2 Jitter, Each Lane	J2	0.33		UI
Stressed Eye J4 Jitter, Each Lane	J4	0.48		UI
SRS Eye Mask Definition {X1, X2, X3, Y1, Y2, Y3}		{0.39, 0.50, 0.50, 0.39, 0.39, 0.4}
Loss of Signal Assert	P_A	-24		-13.6	dBm
Loss of Signal De-assert	PD			-11.6	dBm
LOS Hysteresis	PD - PA	0.5		6	dB

Note:
1.   Transmitter consists of 4 lasers operating at 25.78 Gb/s each.
2.   TDP value does not include MPI penalty.
3.   Hit ratio of 5x10^-5, per IEEE.
4.   Receiver consists of 4 photodetectors operating at 25.78 Gb/s each.
5.   Sensitivity is specified at 5x10^-5 BER.
6.   Measured with CWDM4 MSA2 conformance test signal at TP3 for 5x10^-5 BER.

Electrical Interface Characteristics

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Supply Voltage	VCC	3.135		3.465	V
Supply Current	I_CC			1.12	A
Module Total Power	P			3.5	W	1
Transmitter
Signaling Rate per Lane		25.78125±100ppm			Gb/s
Differential Data Input Swing per Lane	V_in, pp	900			mV
Differential Input Return Loss(min)	RLd(f)	9.5 – 0.37f, 0.01≤f<8 4.75-7.4log10(f/14), 8≤f<19			dB
Differential to Common Mode Input Return Loss(min)	RLdc(f)	22-20(f/25.78), 0.01≤f<12.89 15-6(f/25.78), 12.89≤f<19			dB
Differential Termination Mismatch				10	%
Eye Width			0.46		UI
Applied Pk-Pk Sinusoidal Jitter		Per IEEE802.3bm Table 88-13			--
Eye Height			95		mV
Receiver
Signaling Rate per Lane		25.78125±100ppm			Gb/s
Differential Data Output Wwing	V_out, pp	100		400	mVpp	2
		300		600
		400	600	800
		600		1200
Eye Width		0.57			UI
Vertical Eye Closure	VEC			5.5	dB
Differential Output Return Loss (min)	RLd(f)	9.5-0.37f, 0.01≤f<8 4.75-7.4log10(f/14), 8≤f<19			dB
Common to Differential Mode Conversion Return Loss (min)	RLdc(f)	22-20(f/25.78), 0.01≤f<12.89 15-6(f/25.78), 12.89≤f<19			dB
Differential Termination Mismatch				10	%

Note:
1. Maximum total power value is specified across the full temperature and voltage range.
2. Output voltage is settable in 4 discrete range via I2C.Default range is Range 2 (400 – 800mV).

Digital Diagnostic Functions
Ascent’s QSFP28-100G-LP02 supports transceivers support the I2C-based diagnostics interface specified by the QSFP28 MSA Transceiver temperature.