Ascent Communication Technology

40G QSFP+ SR4 150 m

ASCENT’s QSFP+ Series are designed for use in 40 Gigabit per second links over multimode fiber. They are compliant with the QSFP+ MSA and IEEE 802.3ba 40GBASE-SR4.

• High channel capacity: 40 Gbps per module

• Up to 11.1 Gbps data rate per channel

• 100 m links on OM3 multi-mode fiber

• 150 m links on OM4 multi-mode fiber

• High reliability 850 nm VCSEL technology

• Hot-pluggable

• Digital diagnostic SFF-8436 compliant

• Power dissipation < 0.7 W

• ROHS, FCC complaint

Absolute Maximum Ratings

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Storage Temperature	Ts	‑40	‑	85	°C
Relative Humidity	RH	5	‑	95	%
Power Supply Voltage	VCC	‑0.3	‑	4	V
Signal Input Voltage		Vcc‑0.3	‑	Vcc+0.3	V
Damage threshold		3.4			dBm

Recommended Operating Conditions

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Case Operating Temperature	Tcase	0	‑	70	°C	Without air flow
Power Supply Voltage	V_CC	3.14	3.3	3.46	V
Power Supply Current	I_CC	‑		200	mA
Data Rate	BR		10.3125		Gbps	Each channel
Transmission Distance	TD		‑	100	m	OM3 MMF
				150	m	OM4 MMF

Optical Characteristics

Parameter	Symbol	Min	Typ.	Max	Unit	Note
Transmitter
Center Wavelength	λ₀	840		860	nm
Average Launch Power Each Lane		‑7.6		1.0	dBm
Spectral Width (RMS)	σ			0.65	nm
Optical Extinction Ratio	ER	3			dB
Average Launch Power Off Each Lane	Poff			‑30	dBm
Transmitter and Dispersion Penalty Each Lane	TDP			3.5	dB
Optical Return Loss Tolerance	ORL			12	dB
Output Eye Mask	Compliant with IEEE 802.3ba-2010
Receiver
Receiver Wavelength	λ_in	840		860	nm
Rx Sensitivity per Lane	RSENS			‑11.1	dBm	1
Input Saturation Power (Overload)	Psat	2.4			dBm
Receiver Reflectance	Rr			‑12	dB
LOS De‑Assert	LOSD			‑12	dBm
LOS Assert	LOSA	‑30			dBm
LOS Hysteresis		0.5			dBm

Notes:

1. Measured with a PRBS 2³¹‑1 test pattern, @10.325 Gb/s, BER<10^‑12.

Electrical Characteristics

Parameter	Symbol	Min	Typ.	Max	Unit	Note
Supply Voltage	Vcc	3.14	3.3	3.46	V
Supply Current	Icc			200	mA
Transmitter
Input Differential Impedance	Rin		100		Ω	1
Differential Data Input Swing	Vin, pp	180		1000	mV
Single‑Ended Input Voltage Tolerance	VinT	‑0.3		4.0	V
Receiver
Differential Data Output Swing	Vout, pp	300		850	mV	2
Single‑Ended Output Voltage		‑0.3		4.0	V