Ascent Communication Technology

100G QSFP28 SR4 850 nm 100 m

Ascent ’s QSFP 28-100 G-SR01 is a 100 Gb/s transceiver module designed for optical communication applications compliant to IEEE 802.3bm standards. The optical transmitter portion of the transceiver incorporates a 4-channel VCSEL (Vertical Cavity Surface Emitting Laser) 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. 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. The product is designed with form factor, optical/electrical connection and digital diagnostic interface according to the QSFP+ Multi-Source Agreement (MSA). It has been designed to meet the harshest external operating conditions including temperature, humidity and EMI interference.

· Hot pluggable QSFP28 MSA form factor

· Compliant to Ethernet 100GBASE-SR4

· Supports 103.1 Gb/s aggregate bit rate

· Up to 100 m reach with OM4 multimode fiber

· Up to 70 m reach with OM3 multimode fiber

· Single +3.3V power supply

· Operating case temperature: 0 °C to 70 °C

· <2.0 W power dissipation

· High reliability 850 nm VCSEL technology

· Standard 12 lane with MPO male connector

· Compliant with SFF-8636

· RoHS and FCC compliant

Absolute Maximum Ratings

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Storage Temperature	T_S	‑40		85	°C
Relative Humidity	RH	5		95	%
Power Supply Voltage	Vcc	‑0.3		4.0	V
Signal Input Voltage		Vcc‑0.3		Vcc+0.3	V

Recommended Operating Conditions

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Case Operating Temperature	Tcase	0	-	70	°C	Without air flow
Power Supply Voltage	Vcc	3.14	3.3	3.46	V
Power Supply Current	Icc	-	600	mA
Data Rate	BR	25.78125		Gbps	Each channel
Transmission Distance	TD	-	100	m	OM4
	TD	-	70	m	OM3

Note:

100G Ethernet &100GBASE-SR4 and ITU-T OTU4 has different register setting, not auto-negotiation

Optical Characteristics

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Transmitter
Case Operating Temperature	λ0	840		860	nm
Average Launch Power each lane		-8.4		2.4	dBm
Spectral Width (RMS)	σ			0.6	nm
Optical Extinction Ratio	ER	3			dB
Optical Return Loss Tolerance	ORL			12	dB
Output Eye Mask	Compliant with IEEE 802.3bm-2015					1
Receiver
Receiver Wavelength	λin	840		860	nm
Rx Sensitivity per lane	RSENS			-10.3	dBm	2
LOS De-Assert	LOSD	-30			dBm
LOS Assert	LOSA			-12	dBm
Input Saturation Power (Overload)	Psat	2.4			dBm
Receiver Reflectance	Rr			-12	dB

Notes:

1. Hit ratio 1.5*10^-5 hits per sample

2. Measured with a PRBS 2³¹-1 test pattern, @ 25.78 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			600	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