Ascent Communication Technology

100G QSFP28 DR Single λ 500 m

Ascent’s QSFP28 100G DR1 Ethernet module is a transceiver module designed for 500m optical communication applications, and it is compliant with IEEE 802.3cu 100GBASE-DR standard.

• Compliant with QSFP28 Standard SFF-8636 Rev 2.10a

• Compliant with IEEE 802.3cd 100GBASE-DR

• High speed I/O electrical interface (CAUI-4)

• Single 3.3V Supply Voltage

• Maximum power consumption 4W

• 0-70 ºC Case Operating Temperature

• 1310nm EML laser and PIN Receiver Array

• QSFP28 MSA package with duplex LC connector

• Two Wire Serial Interface with Digital Diagnostic Monitoring

• Complies with EU Directive 2011/65/EU (RoHS compliant)

• Class 1 Laser

Absolute Maximum Ratings

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Storage Temperature	T_S	‑40	‑	+85	°C
Supply Voltage	V_CC	‑0.3	‑	3.6	V
Relative Humidity (non‑condensing)	RH	5	‑	95	%
Data Input Voltage – Differential	\|V_DIP‑V_DIN\|	‑	‑	1.0	V
Control Input Voltage	V_I	‑0.3	‑	Vcc+0.5	V
Control Output Current	I_O	‑20	‑	20	mA

Recommended Operating Conditions

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Operating Case Temperature	T_OPR	0	‑	70	°C
Power Supply Voltage	V_CC	3.135	3.3	3.465	V
Instantaneous Peak Current at Hot Plug	I_{CC_IP}	‑	‑	1600	mA
Sustained Peak Current at Hot Plug	I_{CC_SP}	‑	‑	1320	mA
Maximum Power Dissipation	P_D	‑	‑	4	W	1
Maximum Power Dissipation, Low Power Mode	P_DLP	‑	‑	1.5	W
Signaling Rate	SR	‑	53.125	‑	GBd
Control Input Voltage High	VIH	VCC*0.7	‑	VCC+0.3	V
Control Input Voltage Low	VIL	‑0.3	‑	VCC*0.3	V
Two Wire Serial Interface Clock Rate	‑	‑	‑	400	kHz
Power Supply Noise	‑	‑	‑	66	mVpp	2
Rx Differential Data Output Load	‑	‑	100	‑	ohms
Operating Distance	‑	2	‑	500	m

Notes:

1. With power supply voltage 3.3V.

2. 10 Hz to 10 MHz.

Optical and Electrical Characteristics

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Transmitter
Wavelength	λ_C	1304.5	1311	1317.5	nm
Side Mode Suppression Ratio	SMSR	30	‑	‑	dB
Average Optical Launch Power	P_OUT	‑2.9	‑	4	dBm
Average Launch Power Tx_Off	P_{OUT_OFF}	‑	‑	‑15	dBm
Extinction Ratio	ER	3.5	‑	‑	dB
Outer Optical Modulation Amplitude	OMAouter	‑0.8	‑	4.2	dBm
Launch Power in OMAouter Minus TDECQ for ER ≥ 4.5dB	OMAouter‑ TDECQ	‑2.2	‑	‑	dBm
Launch Power in OMAouter Minus TDECQ for ER < 4.5dB	OMAouter‑ TDECQ	‑1.9	‑	‑	dBm
Transmitter and Dispersion Eye Closure	TDECQ	‑	‑	3.4	dB
TDECQ – 10*log10(Ceq)		‑	‑	3.4	dB
Transmitter transition time		‑	‑	17	ps
RIN17.1OMA	RIN	‑	‑	‑136	dB/Hz
Optical return loss tolerance	ORLT	‑	‑	15.5	dB
Transmitter reflectance	TR	‑	‑	‑26	dB
Receiver
Wavelength	λ_C	1304.5	1311	1317.5	nm
Damage Threshold		5	‑	‑	dBm
Average Receive Power		‑5.9	‑	4	dBm
Receive Power (OMAouter)	RP	‑	‑	4.2	dBm
Receiver Reflectance	RR	‑	‑	‑26	dB
Receiver Sensitivity (OMAouter)	RS			max(‑3.9, SECQ‑5.3)	dBm
Stressed Receiver Sensitivity	SRS	‑	‑	‑1.9	dBm
Stressed Receiver Sensitivity Test Conditions
Stressed Eye Closure for PAM4 (SECQ)	SECQ	‑	3.4	‑	dB
SECQ – 10*log10(Ceq)		‑	‑	3.4	dB

Electrical Specifications

Low‑Speed Signal: Compliant to SFF‑8679

High‑Speed Signal: Compliant to CAUI‑4 (IEEE 802.3‑2018)

Parameter	Symbol	Min.	Typ.	Max.	Unit	Notes
Transmitter (Module Input)
Differential Data Input Amplitude	V_IN, P‑P	95	‑	900	mVpp	1
Differential Termination Mismatch		‑	‑	10	%
LPMode, Reset and ModSelL	V_IL	‑0.3	‑	Vcc*0.3	V
	V_IH	VCC*0.7	‑	VCC+0.3	V
Receiver (Module Output)
Differential Data Output Amplitude	V_OUT, P‑P	250	‑	900	mVpp	1
Differential Termination Mismatch		‑	‑	10	%
Output Rise/Fall Time, 20% to 80%	T_R	9.5	‑	‑	ps
ModPrsL and IntL	V_OL	0	‑	0.4	V	IOL = 4 mA
	V_OH	VCC‑0.5	‑	VCC+0.3	V	IOL = ‑4 mA

Note 1: Amplitude customization beyond these specs is dependent on validation in customer system

Support for 100GAUI‑4 at 26.5625 Gbd when using KP4 FEC in chip‑to‑module interface.

Timing for QSFP28 Soft Control and Status Functions

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Initialization Time	t_init	‑	‑	15	s	1
Reset Init Assert Time	t_reset_init	10	‑	‑	µs
Serial Bus Hardware Ready Time	t_serial	‑	‑	2000	ms
Monitor Data Ready Time	t_data	‑	‑	2000	ms
Reset Assert Time	t_reset	‑	‑	15	s	1
LPMode Assert Time	ton_LPMode	‑	‑	100	µs
LPMode De‑assert Time	toff_LPMode	‑	‑	15	s	1
IntL Assert Time	ton_IntL	‑	‑	200	ms
IntL Deassert Time	toff_IntL	‑	‑	500	µs
Rx LOS Assert Time	ton_lol	‑	‑	100	ms
Tx Fault Assert Time	ton_Txfault	‑	‑	200	ms
Flag Assert Time	ton_flag	‑	‑	200	ms
Mask Assert Time	ton_mask	‑	‑	100	ms
Mask Deassert Time	toff_mask	‑	‑	100	ms
Application or Rate Select Change Time	t_ratesel	‑	‑	N/A	ms	2
Power_over‑ride or Power‑set Assert Time	ton_Pdown	‑	‑	100	ms
Power_over‑ride or Power‑set De‑assert Time	toff_Pdown	‑	‑	15	s	1

Notes:

1. DSP limitation.

2. This feature is unsupported.

I/O Timing for Squelch & Disable

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Rx Squelch Assert Time	ton_Rxsq			500	ms	1
Rx Squelch Deassert Time	toff_Rxsq			15	s	1
Tx Squelch Assert Time	ton_Txsq			400	ms
Tx Squelch Deassert Time	toff_Txsq			1500	ms	1
Tx Disable Assert Time	ton_txdis			100	ms
Tx Disable Deassert Time	toff_txdis			400	ms
Rx Output Disable Assert Time	ton_rxdis			100	ms
Rx Output Disable Deassert Time	toff_rxdis			100	ms
Squelch Disable Assert Time	ton_sqdis			100	ms
Squelch Disable Deassert Time	toff_sqdis			100	ms

Note 1: DSP limitation.

Digital Diagnostics

Parameter	Range	Accuracy	Unit	Calibration
Temperature	0 to 70	±3	°C	Internal
Voltage	0 to V_CC	3 %	V	Internal
Tx Bias Current (each Lane)	0 to 100	10 %	mA	Internal
Tx Output Power (each Lane)	‑2.4 to 4.0	±3	dB	Internal
Rx Power (each Lane)	‑6.4 to 4.5	±3	dB	Internal