Ascent Communication Technology

40G QSFP+ SR4 150 m

Ascent’s QSFP-AQMP-85-01 QSFP transceivers are designed for use in 40 Gigabit per second links over multimode fiber. They are compliant with the QSFP+ MSA and IEEE 802.3ba-2010 40GBASE-SR4. The optical transmitter portion of the transceiver incorporates a 4-channel VCSEL array, a 4-channel input buffer and laser driver, diagnostic monitors, control and bias blocks. For module control, the control interface incorporates a Two Wire Serial interface of clock and data signals. Diagnostic monitors for VCSEL bias, module temperature, transmitted optical power, received optical power and supply voltage are implemented and results are available through the TWS interface. Alarm and warning thresholds are established for the monitored attributes. Fault detection or channel deactivation through the TWS interface will disable the channel. Status, alarm/warning and fault information are available via the TWS interface. The optical receiver portion of the transceiver incorporates a 4-channel PIN photodiode array, a 4- channel TIA array, a 4-channel output buffer, diagnostic monitors, and control and bias blocks. Diagnostic monitors for optical input power are implemented and results are available through the TWS interface. Alarm and warning thresholds are established for the monitored attributes.

· 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 consumption < 1.5 W

· RoHS, FCC compliant

Absolute Maximum Ratings

Parameter Storage Temperature	Symbol Ts	Min. -40	Typ. -	Max. 85	Unit Note °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 Case Operating Temperature	Symbol Tcase	Min. 0	Typ. -	Max. 70	Unit °C	Note Without air flow
Power Supply Voltage	V_CC	3.135	3.3	3.465	V
Power Supply Current	I_CC	-		420	mA
Data Rate	BR		10.3125		Gbps	Each channel
Transmission Distance	TD		-	100	m	OM3 MMF
				150	m	OM4 MMF

Optical Characteristics

Parameter Transmitter Center Wavelength	Symbol λ0	Min 840	Typ.	Max 860	Unit nm	Note
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	λin	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 Transmitter Input Differential Impedance	Icc Rin		100	200	mA 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