Ascent Communication Technology

40GBASE-UNIV QSFP+ MMF and SMF

Ascent’s QSFP-AQ-LP-W4-02U is a transceiver module designed for 2 km (SMF) / 150 m (MMF) optical communication applications. They are compliant with the IEEE 802.3ba 40GBASE-LR4 standard referred to as LM4. The module converts 4 input channels (ch) of 10 Gb/s electrical data to 4 CWDM optical signals, and multiplexes them into a single channel for 40 Gb/s optical transmission. On the receiver side, the module optically de-multiplexes a 40 Gb/s input into 4 CWDM channel signals, and converts them into 4 channels of output electrical data.

• Hot-pluggable QSFP+ form factor

• Operates over duplex multi-mode and single-mode fiber with dual LC receptacles

• Supports 41.2 Gbs/ aggregate bit rate

• Up to 2 km transmission distance over SMF

• Up to 150 m transmission distance on OM3

• Hot-pluggable QSFP+ form factor

• Uncooled 4x 10 Gb/s CWDM transmitter

• XLPPI electrical interface

• Built-in digital diagnostic functions, including Tx/Rx power monitoring

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

• Power dissipation < 3.5 W

• Compliant with IEEE 802.3ba

• RoHS compliant

General Product Characteristics

Item	Value	Notes
Module Form Factor	QSFP+
Maximum Aggregate Data Rate	41.2 Gb/s
Maximum Data Rate per Lane	10.3125 Gb/s
Protocols Supported	40G Ethernet
Electrical Interface and Pin‑out	38‑pin edge connector	Pin‑out as defined by the QSFP+ MSA
Maximum Power Consumption	3.5 W
Management Interface	Serial, I2C‑based, 400 kHz maximum frequency	As defined by the QSFP+ MSA

Data Rate Specifications

Item	Symbol	Min.	Typ.	Max.	Unit	Note
Bit Rate per Lane	BR			10.313	Gb/sec	1
Bit Error Ratio	BER			10^‑12		2
Link Distance on OM3	d			150	m
Link Distance on OM4	d			160	m
Link Distance on SMF	d			2000	m

Notes:

1. Adapted from 40GBASE‑LR4, IEEE 802.3ba

2. Tested with a PRBS 2³¹‑1 test pattern.

Absolute Maximum Ratings

Item	Symbol	Min.	Typ.	Max.	Unit	Notes
Maximum Supply Voltage	Vcc1, VccTx, VccRx	‑0.5		4	V
Storage Temperature	Ts	‑40		85	°C
Case Operating Temperature	Top	0		70	°C
Relative Humidity	RH	0		85	%	Non‑condensing
Damage Threshold, per Lane	DT	3.4			dBm

Electrical Characteristics (TOP = 0 °C to 70°C, VCC = 3.1 V to 3.47 V)

Item	Symbol	Min.	Typ.	Max.	Unit	Notes
Supply Voltage	Vcc1, VccTx, VccRx	3.1		3.47	V
Supply Current	Icc			1.13	A
Transmit Turn‑On Time				2000	ms	1
Transmitter (per Lane)
Single‑Ended Input Voltage Tolerance	VinT	‑0.3		4.0	V
Differential Data Input Swing	Vin,pp	120		1200	mVpp	2
Differential Input Threshold			50		mV
AC Common Mode Input Voltage Tolerance (RMS)		15			mV
Differential Input Return Loss	Per IEEE P802.3ba, Section 86A.4.1.1				dB	3
J2 Jitter Tolerance	Jt2	0.17			UI
J9 Jitter Tolerance	Jt9	0.29			UI
Data Dependent Pulse Width Shrinkage	DDPWS	0.07			UI
Eye Mask Coordinates {X1, X2, Y1, Y2}		0.11, 0.31, 95, 350			UI mV	4
Receiver (per Lane)
Single‑Ended Output Voltage		‑0.3		4.0	V
Differential Data Output Swing	Vout,pp	0		800	mVpp	5
AC Common Mode Output Voltage (RMS)				7.5	mV
Termination Mismatch at 1 MHx				5	%
Differential Output Return Loss	Per IEEE P802.3ba, Section 86A.4.2.1				dB	3
Common Mode Output Return Loss	Per IEEE P802.3ba, Section 86A.4.2.2				dB	3
Output Transition Time, 20% To 80%		28			ps
J2 Jitter Output	Jo2			0.42	UI
J9 Jitter Output	Jo9			0.65	UI
Eye Mask Coordinates #1 {X1, X2, Y1, Y2}		0.29, 0.5 150, 425			UI mV	4
Power Supply Ripple Tolerance	PSR	50			mVpp

Notes:

1. From power‑on and end of any fault conditions.

2. After internal AC coupling. Self‑biasing 100 Ω differential input.

3. 10 MHz to 11.1 GHz range

4. Hit ratio = 5 x 10^‑5

5. AC coupled with 100 Ω differential output impedance.

Optical Characteristics (TOP = 0 to 70°C, VCC = 3.1 to 3.47 V)

Item	Symbol	Min.	Typ.	Max.	Unit	Notes
Transmitter (per Lane)
Signaling Speed per Lane				11.2	GBd	1
Lane Center Wavelengths (Range)		1264.5‑1277.5 1284.5‑1297.5 1304.5‑1317.5 1324.5‑1337.5			nm
Total Average Launch Power	Pout			8.3	dBm
Average Launch Power per Lane, MMF	TXPx	‑7.0		4.3	dBm
Average Launch Power per Lane, SMF	TXPx	‑10.0		2.3	dBm	2
Transmit OMA per Lane, MMF	TxOMA	‑3.0		4.8	dBm
Transmit OMA per Lane, SMF	TxOMA	‑6.0		3.5	dBm	3
Transmitter Dispersion Penalty, MMF	TXP‑TDP			4.7	dBm
Transmitter Dispersion Penalty, SMF	TXP‑TDP			2.6	dBm
Average Launch Power of OFF Transmitter, per Lane				‑30	dBm
Relative Intensity Noise	RIN			‑128	dB/Hz	4
Sidemode Suppression Ratio	SSRmin	30			dB
Optical Extinction Ratio	ER	3.5			dB
Optical Return Loss Tolerance				20	dB
Transmitter Reflectance				‑12	dB
Transmitter Eye Mask Definition {X1, X2, X3, Y1, Y2, Y3}		(0.25, 0.4, 0.45, 0.25, 0.28, 0.4)
Jitter Generation		Per OTL3.4 section 4.14.1
Receiver (per Lane)
Signaling Speed per Lane				11.2	GBd	5
Lane Center Wavelengths (Range)		1264.5‑1277.5 1284.5‑1297.5 1304.5‑1317.5 1324.5‑1337.5			nm
Receive Power (OMA) per Lane, MMF	RxOMA			4.8	dBm
Receive Power (OMA) per Lane, SMF	RxOMA			3.3	dBm
Damage Threshold per Lane	PMAX			5.5	dBm
Average Receive Power per Lane, MMF	RXPx	‑10.0		4.3	dBm
Average Receive Power per Lane, SMF	RXPx	‑13.7		2.3	dBm	6
Receiver Sensitivity (OMA) per Lane, MMF	Rxsens			‑10.5	dBm
Receiver Sensitivity (OMA) per Lane, SMF	Rxsens			‑10.5	dBm	7
Stressed Receiver Sensitivity (OMA) per Lane, MMF	SRS			‑5.0	dBm
Stressed Receiver Sensitivity (OMA) per Lane, SMF	SRS			‑8.5	dBm
Return Loss	RL			‑20	dB
Vertical Eye Closure Penalty, per Lane				3.6	dB
Receive Electrical 3 Db Upper Cutoff Frequency, per Lane				12.3	GHz
LOS De‑Assert	LOSD			‑12	dBm	8
LOS Assert	LOSA	‑28			dBm	8
LOS Hysteresis			1		dB