Ascent Communication Technology

100G QSFP28 ER4 1310 nm 40 km

Ascent’s QSFP28-100G-LP40 is a 100Gb/s transceiver module designed for optical communication applications compliant to Ethernet 100GBASE-ER4 Lite standard. The module converts 4 input channels of 25Gb/s electrical data to 4 channels of LAN WDM optical signals and then multiplexes them into a single channel for 100Gb/s optical transmission. Reversely on the receiver side, the module de- multiplexes a 100Gb/s optical input into 4 channels of LAN WDM optical signals and then converts them to 4 output channels of electrical data.

• Compliant with 100GBASE-ER4

• Support line rates from 103.125 Gbps to 111.81 Gbps

• Integrated LAN WDM TOSA / APD ROSA for up to 40 km reach with FEC, 30 km without

• Digital Diagnostics Monitoring Interface

• Duplex LC optical receptacle

• No external reference clock

• Electrically hot-pluggable

• Compliant with QSFP28 MSA with LC connector

• Case operating temperature range:0 °C to 70 °C

• Power dissipation < 4.0 W

Absolute Maximum Ratings

Note that the operation in excess of any individual absolute maximum ratings might cause permanent damage to this module.

Parameter	Symbol	Min.	Max.	Unit	Notes
Storage Temperature	TS	‑40	85	°C
Operating Case Temperature	TOP	0	70	°C
Power Supply Voltage	VCC	‑0.5	3.6	V
Relative Humidity (Non‑Condensing)	RH	0	85	%
Damage Threshold, per Lane	THd	‑3.0		dBm

Recommended Operating Conditions and Power Supply Requirements

Parameter	Symbol	Min.	Typ.	Max.	Unit	Notes
Operating Case Temperature	T_OP	0		70	°C
Power Supply Voltage	V_CC	3.135	3.3	3.465	V
Data Rate (per Lane)			25.78125		Gb/s
Data Rate Accuracy		‑100		100	ppm
Control Input Voltage High		2		Vcc	V
Control Input Voltage Low		0		0.8	V
Link Distance with G.652 (without FEC)	D1			30	km	1
Link Distance with G.652 (with FEC)	D2			40	km	1

Notes:

1. Depending on actual fiber loss/km (link distance specified is for fiber insertion loss of 0.4dB/km)

Electrical Characteristics

The following electrical characteristics are defined over the Recommended Operating Environment unless otherwise specified.

Parameter	Test Point	Min.	Typ.	Max.	Unit	Notes
Power Consumption				4.5	W
Supply Current	Icc			1.36	A
Transmitter (per Lane)
Overload Differential Voltage pk‑pk	TP1a	900			mV
Common Mode Voltage (Vcm)	TP1	‑350		2850	mV	1
Differential Termination Resistance Mismatch	TP1			10	%	At 1 MHz
Differential Return Loss (SDD11)	TP1			See CEI‑ 28G‑VSR Equation 13‑19	dB
Common Mode to Differential conversion and Differential to Common Mode conversion (SDC11, SCD11)	TP1			See CEI‑ 28G‑VSR Equation 13‑20	dB
Stressed Input Test	TP1a	See CEI‑ 28G‑VSR Section 13.3.11.2.1
Receiver (per Lane)
Differential Voltage, pk‑pk	TP4			900	mV
Common Mode Voltage (Vcm)	TP4	‑350		2850	mV	1
Common Mode Noise, RMS	TP4			17.5	mV
Differential Termination Resistance Mismatch	TP4			10	%	At 1 MHz
Differential Return Loss (SDD22)	TP4			See CEI‑ 28G‑VSR Equation 13‑19	dB
Common Mode to Differential conversion and Differential to Common Mode conversion (SDC22, SCD22)	TP4			See CEI‑ 28G‑VSR Equation 13‑21	dB
Common Mode Return Loss (SCC22)	TP4			‑2	dB	2
Transition Time, 20 to 80%	TP4	9.5			ps
Vertical Eye Closure (VEC)	TP4			5.5	dB
Eye Width at 10‑15 probability (EW15)	TP4	0.57			UI
Eye Height at 10‑15 probability (EH15)	TP4	228			mV

Notes:

1. Vcm is generated by the host. Specification includes effects of ground offset voltage.

2. From 250 MHz to 30 GHz.

Optical Characteristics

Ethernet 100GBASE‑ER4 Lite
Parameter	Symbol	Min.	Typ.	Max.	Unit	Notes
Lane Wavelength	L0	1294.53	1295.56	1296.59	nm
	L1	1299.02	1300.05	1301.09	nm
	L2	1303.54	1304.58	1305.63	nm
	L3	1308.09	1309.14	1310.19	nm
Transmitter
SMSR	SMSR	30			dB
Total Average Launch Power	P_T			10.5	dBm
Average Launch Power (per Lane)	P_AVG	‑2.9		4.5	dBm	1
OMA (per Lane)	P_OMA	0.1		4.5	dBm	2
Difference in Launch Power Between Any Two Lanes (OMA)	Ptx, diff			3.6	dB
Launch Power in OMA Minus Transmitter and Dispersion Penalty (TDP) (per Lane)		‑0.65			dBm
TDP (per Lane)	TDP			2.5	dB
Extinction Ratio	ER	7			dB
RIN₂₀OMA	RIN			‑130	dB/Hz
Optical Return Loss Tolerance	TOL			20	dB
Transmitter Reflectance	R_T			‑12	dB
Average Launch Power OFF Transmitter (per Lane)	Poff			‑30	dBm
Eye Mask {X1, X2, X3, Y1, Y2, Y3}		{0.25, 0.4, 0.45, 0.25, 0.28, 0.4}
Receiver
Damage Threshold (per Lane)	TH_d	‑3.0			dBm	3
Average Receive Power (per Lane)		‑16.9		‑4.9	dBm	For 30 km link distance
Average Receive Power (per Lane)		‑20.9		‑4.9	dBm	For 40 km link distance
Receive Power (OMA) (per Lane)				‑1.9	dBm
Receiver Sensitivity (OMA) (per Lane)	SEN1			‑14.65	dBm	For BER = 1x10^‑12
Stressed Receiver Sensitivity (OMA) (per Lane)				‑12.65	dBm	For BER = 1x10^‑12
Receiver Sensitivity (OMA) (per Lane)	SEN2			‑18.65	dBm	For BER = 5x10^‑5
Stressed Receiver Sensitivity (OMA) (per Lane)				‑16.65	dBm	For BER = 5x10^‑5
Receiver Reflectance				‑26	dB
Difference in Receive Power between any Two Lanes (Average and OMA)	Prx, diff			3.6	dB
LOS Assert	LOSA		‑26		dBm
LOS De‑Assert	LOSD		‑24		dBm
LOS Hysteresis	LOSH	0.5			dB
Receiver Electrical 3 dB Upper Cutoff Frequency (per Lane)	Fc			31	GHz
Conditions of Stress Receiver Sensitivity Test (Note 4)
Vertical Eye Closure Penalty (per Lane)			1.5		dB
Stressed Eye J2 Jitter (per Lane)			0.3		UI
Stressed Eye J9 Jitter (per Lane)			0.47		UI

Notes:

1. The minimum average launch power spec is based on ER not exceeding 9.5dB and transmitter OMA higher than 0.1dBm.

2. Even if the TDP < 0.75 dB, the OMA min must exceed the minimum value specified here.

3. The receiver shall be able to tolerate, without damage, continuous exposure to a modulated optical input signal having this power level on one lane. The receiver does not have to operate correctly at this input power.

4. Vertical eye closure penalty, stressed eye J2 jitter, and stressed eye J9 jitter are test conditions for measuring stressed receiver sensitivity. They are not characteristics of the receiver.