Ascent Communication Technology

40G QSFP+ SR4 300 m

Ascent’s QSFP-AQ-MP-85-03 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 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.

· Compliant with QSFP+ MSA Specification

· Operating Temperature(0°C to 70°C)

· 4x10Gbps 850nm VCSEL-based Transmitter

· Maximum Link Length of 300m via OM3 Multimode Fiber(MMF)

· Be compliant to the 40GbE XLPPI electrical specification per IEEE 802.3ba-2010

· Be compliant to the IEEE 802.3ae 10GBASE-SR optical specification

Absolute Maximum Ratings

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Storage Temperature	TS	-40		85	°C
Relative Humidity	RH	0		85	%

Recommended Operating Conditions

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Operating Case Temperature	Tc	0		70	°C
Power Supply Voltage	Vcc	3.135	3.3	3.465	V
Signaling Rate each Channel			10.3125		Gbps
Supply Noise Rejection		---	---	100	mV
Receiver Differential Data Output		---	100		Ohm
Operating Distance	D			300	m	OM3 MMF

Optical Characteristics

Parameter	Symbol	Min	Typ.	Max	Unit	Note
Transmitter
Signaling Rate, each lane (range)	GBb		10.3125		GBb
Center Wavelength	λ	840	850	860	nm
RMS Spectral Width	SW			0.6	nm
Average Launch Power, each Lane	Pf	-4		2.4	dBm
Optical Modulation Amplitude (OMA), each Lane	TxOMA	-4		3	dBm
Average Launch Power of OFF Transmitter, each Lane				-30	dBm
Extinction Ratio	ER	3			dB
Optical Return Loss Tolerance				12	dB
Receiver
Signaling rate, each lane (range)	GBb		10.3125		GBb
Center Wavelength	λ	840		860	nm
Damage threshold		3.4			dBm
Average power at receiver input, each lane		-11.5		2.4	dBm
Receive power, each lane (OMA)				3	dBm
Receiver sensitivity (OMA)	SOMA			-11.1	dBm	BER@1e-12
Receiver reflectance				-12	dB
LOS Assert	LOSA	-30			dBm
LOS De-Assert	LOSD			-11	dBm
LOS Hysteresis		0.5			dB