Ascent Communication Technology

40/100G SFP28 SWDM4 100m

Ascent’s 40G/100G QSFP28 SWDM4 transceiver modules are designed for use in 40G/100GEthernet links over duplex multi-mode fiber. Four channels/lanes in the 850 nm to 940 nm region @ 10.3125 Gb/s / @25.78 Gbps to transport the Ethernet signal. Digital diagnostics functions are available via an I2C interface, as specified by the QSFP28 MSA.

· 4x25 Gb/s 850nm VCSEL-based Transmitter

· Hot-pluggable QSFP28 Form Factor

· Supports 40G/100G dual-rate operation

· Power Consumption < 3.5 W

· Duplex LC connector

· Compliant with QSFP28 MSA, SWDM MSA and IEEE802.3bm CAUI-4

· Maximum link length of 150 m on OM5 multi-mode Fiber

· Operating Temperature Range: 0 °C to 70 °C

· RoHS Compliant

Absolute Maximum Ratings

Parameter	Symbol	Min.	Max.	Unit
Storage Temperature Range	TS	-40	85	°C
Supply Voltage	V_CC	-0.5	3.6	V
Relative Humidity	RH	15%	85%

Recommended Operating Conditions

Parameter	Symbol	Min.	Max.	Unit
Operating Case Temperature	Tcase	0	70	°C
Supply Voltage	V_CC	3.14	3.46	V
Power Consumption	P		3.5	W
Link Distance on OM3 Fiber (100G)			75	M
Link Distance on OM4 Fiber (100G)			100	M
Link Distance on OM5 Fiber (100G)			150	M
Link Distance on OM3 Fiber (40G)			240	M
Link Distance on OM4 Fiber (40G)			350	M
Link Distance on OM5 Fiber (40G)			440	M

Optical Characteristics @10.3125 Gb/s

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Transmitter
Signaling Rate, Each Lane		10.3125, 9.953 ± 100 ppm			Gb/s
Lane Wavelength Range	Lane0 Lane1 Lane2 Lane3	84 874 904 934		858 888 918 948	nm
Difference in Launch Power Between Any Two Lanes				4.5	dBm
RMS Spectral Width @850nm, @880nm, @910nm, @940nm	Lane0 Lane1 Lane2 Lane3			0.53 0.59 0.59 0.59	nm
Optical Modulation Amplitude (OMA), Each Lane		-5.5		3	dBm
Average Launch Power Per Lane		-7.5		3	dBm
Launch Power Tx OMA-TDP	Lane0 Lane1 Lane2 Lane3	-6.4 -6.0 -6.5 -7.0			dBm
Transmitter and Dispersion Eye Closure	Lane0 Lane1 Lane2 Lane3			3.7 4.0 4.5 5.0	dB
Extinction Ratio		2			dB
Optical Return Loss Tolerance		12			dB
Average Launch Power Per Lane @ TX Off State				-30	dBm
Encircled Flux		>=86% at 19um<=30% at 4.5um
Transmitter Eye Mask Definition {X1, x2, X3, Y1, Y2. Y3} Hit Ratio 5x10-5 Hits Per Sample		{0.23, 0.34, 0.43, 0.27, 0.35, 0.4}
Receiver
Signaling Rate, Each Lane		10.3125, 9.953 ± 100 ppm			Gb/s
Lane Wavelength Range	Lane0 Lane1 Lane2 Lane3	844 874 904 934		858 888 918 948	nm
Damage Threshold, Each Lane		3.8			dBm
Average Receive Power, Each Lane		-12.9 -12.5 -12.2 -11.9		2.4	dBm
Receiver Power, each lane (OMA)				3	dBm
Receiver sensitivity OMA, per lane				-9.1	dB
Difference in Receive Power Between Any Two Lanes (OMA)				5	dB
RX_Los_Assert		-30			dBm
RX_Los_De-ASSERT				-13	dBm
RX_Los_Hysteresis		0.5			dBm
Return Reflectance				-12	dB

Optical Characteristics @25.78125Gb/s

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Transmitter
Signaling Rate, Each Lane		25.78125 ± 100 ppm			Gb/s
Lane Wavelength Range	Lane0 Lane1 Lane2 Lane3	844 874 904 934		858 888 918 948	nm
Modulation Format			NRZ
Difference in Launch Power Between Any Two Lanes				4.5	dBm
RMS Spectral Width				0.59	nm	1
Optical Modulation Amplitude (OMA), Each Lane		-5.5		3	dBm	2
Average Launch Power Per Lane @ TX Off State				-30	dBm
Launch Power in OMA Minus TDEC	Lane0 Lane1 Lane2 Lane3	-7 -7 -7.4 -7.7			dBm
Transmitter and Dispersion Eye Closure	Lane0 Lane1 Lane2 Lane3			4 4 4.4 4.8	dB	3
Extinction Ratio		2			dB	4
Optical Return Lass Tolerance				12	dB
Encircled Flux		>86% at 19 µm s30% at 4.5 µm
Transmitter Eye Mask Definition {X1, X2, X3, Y1, Y2. Y3} Hit Ratio 1.5x10-3 Hits Per Sample		{0.3, 0.38, 0.45, 0.35, 0.41, 0.5}
Receiver
Signaling Rate, Each Lane		25.78125 ± 100 ppm			Gb/s
Lane Wavelength Range	Lane0 Lane1 Lane2 Lane3	844 874 904 934		858 888 918 948	nm
Modulation Format			NRZ
Damage Threshold		4.4			dBm
Average Receive Power, Each Lane	Lane0 Lane1 Lane2 Lane3	-9.5 -9.4 -9.4 -9.4		3.4	dBm
Receiver Power, Each Lane (OMA)				3	dBm
Receiver Reflectance				-12	dB
Unstressed Receiver Sensitivity (OMA)	Lane0 Lane1 Lane2 Lane3			-8.2 -8.4 -8.6 -8.8	dBm	5
RX_Los_Assert		-30			dBm
RX_Los_De-Assert				-12	dBm
RX_Los_Hysteresis		0.5			dBm

Notes:

1. RMS spectral width is the standard deviation of the spectrum.
2. The normative lowest value of OMA for a compliant transmitter is 'Launch power in OMA minus TDEC, each lane (min)' plus the actual value of 'TDEC', but with a value of at least 'OMA, each lane miny.
3. TDEC is calculated from the measured TDECm using the methods in 3.6. TDECm is measured following the method in IEE 802.3 clause95.8.5 µsing a 12.6 GHz bandwidth reference receiver for all lanes.
4. If measured into type A1a.2 or type A1a.3 50 µm fiber in accordance with IEC 61280-1-4.
5. Unstressed sensitivity at BER of 5E-5(pre FEC)

Electrical Characteristics

Parameter	Min.	Typ.	Max.	Unit
Transmitter
Signaling Rate Per Lane (Range)	25.78125 ± 100 ppm			GBd
Differential Input Return Loss	Equation (83E-5)			dB
Differential to Common Mode Input Return Loss	Equation (83E-6)			dB
Differential Termination Mismatch			10	%
Module Stressed Input Test	See 83E3.4.1
Differential Pk-pk Input Voltage Tolerance	900			mV
DC Common Mode Voltage	-350		2850	mV
Single Ended Voltage Tolerance Range	-0.4		3.3	V
Receiver
Signaling Rate Per Lane (Range)	25.78125 ± 100 ppm			GBd
AC Common-mode Output Voltage (RMS)			17.5	mV
Differential Output Voltage			900	mV
Eye Width	0.57			UI
Eye Height, Differential	228			mV
Vertical Eye Closure			5.5	dB
Differential Output Return Loss	Equation (83E-2)			dB
Common to Differential Mode Conversion Return Loss	Equation (83E-3)			dB
Differential Termination Mismatch			10	%
Transition Time (20% to 80%)	12			ps
DC Common Mode Voltage	-350		2850	mV