Ascent Communication Technology

100 Gb/s 120km QSFP28 Coherent Transceiver

Ascent’s 100G Coherent is a 100Gbps QSFP28 optical module designed for single or multi-span DWDM links, as well as unamplified point-to-point links up to 120km. The module allows for dispersion compensation of standard single-mode fiber up to a distance of 2,000km depending on FEC mode. The product is designed with form factor and optical/electrical connection according to the QSFP28 MSA with DD and the Common Management Interface Specification (CMIS) in the OIF Coherent CMIS implementation agreement.

§ Hot-pluggable

§ Transmission reaches up to 120km in unamplified applications

§ Duplex LC connector

§ Metal package for lower EMI

§ Single 3.3V power supply

§ Maximum power consuconsumption 13W(ST), 15W(IT)

§ RoHS-6 compliant

Specifications

General Operating Characteristics

Parameter	Symbol	Min	Typ.	Max	Unit	Note
Absolute Supply Voltage	Vcc_max	0	-	4.0	V	-
Operating Voltage	Vcc	3.135	-	3.465	V	-
Power Consumption	-	-	-	13	W	1
Power Consumption	-	-	-	15	W	1
Operating Case Temperature (ST)	Top	-5	-	70	°C	2
Operating Case Temperature (IT)	Top	-40		85	°C	-
Storage and Transportation Temperature	Tst	-40	-	85	°C	4
Relative Humidity	RH	5	-	85	100%	3
Maximum Transmission Distance (unamplified)	Dmax	-	-	120	km	-

Note:

1. For SCFEC, Other modes incl. SDFEC are TBD. 13W for ST and 15W for IT.

2. Measured on top side front center of QSFP28 module.

3. Non-condensing.

Optical Characteristics

Parameter	Symbol	Min	Typ.	Max	Unit	Note
Symbol Rate	Gbaud	-	-	32	GBd	-
Modulation Format	-	DP-(d)QPSK			-	-
Channel Frequency Range	-	191.3	-	196.1	THz
Channel Spacing	-	-	50	-	GHz	2
Frequency Accuracy	-	-2.5	-	2.5	GHz	-
Laser Intrinsic Linewidth	LW	-	-	300	KHz	4
Relative Intensity Noise	-	-	-	-140	dB/Hz	-

Note:

Transmitter Optical Characteristics

Parameter	Symbol	Min	Typ.	Max	Unit	Note
Data rate	-	-	-	128	Gb/s	-
Side Mode Suppression Ratio	SMSR	40	-	-	dB	-
Tx Output Power	Pt	-8	-	-5	dBm	-
Tx Output Power Monitor Accuracy	-	-2	-	2	dB	-
Tx Output Power Imbalance Between X-Pol and Y-Pol	Px/y	-	-	2	dB	-
Tx XY Skew	LW	-	-	3	ps	-
Tx IQ Offset	-	-	-	-24	dB	-
Tx IQ Imbalance	-	-	-	1	dB	-
Tx Quadrature Error	-	-5	-	5	degree	-
Tx IQ Skew	-	-	-	2	ps	-
Tx Error Vector Magnitude Mask Ratio	EVM	-	-	18	%	-
Tx In-Band OSNR	OSNRin	40	-	-	dB/0.1nm	-
Parameter	Symbol	Min	Typ.	Max	Unit	Note
Tx Reflectance	-	-	-	-22	dB	-

Receiver Optical Characteristics

Parameter	Symbol	Min	Typ	Max	Unit	Note
Rx Signal Input Power (Unamplified)	Pin	-40	-	+5	dBm	-
Average Rx Sensitivity	Rsen	-	-	-32	dBm	-
CD Tolerance	-	-	-	10	ns/nm	1
PMD Tolerance	-	-	-	16	ps	2
Polarization Dependent Loss(2dB) OSNR Penalty	-	-	-	1	dB	-
Rx Signal Input Power Transient Amplitude	-	-3	-	3	dB	-
State of Polarization Tracking (< 0.5dB OSNR Penalty)		-	-	100	KHz
Rx Signal Input Power Transient Rise/Fall Time	-	0.1	-		ms	-
Rx Signal Input Power Monitor Range	-	-40	-	+5	dBm	-
Rx Signal Input Power Monitor Accuracy	-	-3	-	3	dB	-
Rx Reflectance	-	-	-	-22	dB	-
LOS Assert	LOS A	-40	-	-	dBm	-
LOS De-assert	LOS De	-	-	-32	dBm	-
LOS Hysteresis	-	0.5	-	5	dB	-
Metro OSNR	OSNRmin	16.5	-	-	dB/0.1nm	3
	OSNRmin	15	-	-	dB/0.1nm	4
LH OSNR	OSNRmin	11.2	-	-	dB/0.1nm	5
	OSNRmin	11	-	-	dB/0.1nm	6

Notes:

1. For SCFEC. Other modes with higher CD tolerance incl. SDFEC are TBD.

2. First and second order PMD to the Maximum Mean DGD.

3. DQPSK, GFEC 7% OH, 28Gbaud, dispersion tolerance up to 100km on SMF.

4. DQPSK, SCFEC 7% OH, 28Gbaud, dispersion tolerance up to 500km on SMF.

5. QPSK, OFEC 15% OH, 31.57Gbaud, dispersion tolerance up to 2,000km on SMF, will be supported in the

near future.

6. QPSK, OFEC 15% OH, 30Gbaud, dispersion tolerance up to 2,000km on SMF, will be supported in the

near future Laser Safety: All transceivers in this datasheet are Class I Laser products per FDA/CDRH and

IEC-60825 standards. They must be operated under specified operating conditions.

Electrical Characteristics (Over Operating Case Temperature Range, Vcc = 3.14V to 3.47V)

Parameter	Symbol	Min		Typ.		Max	Unit	Note
Transmitter
Data Rate, NRZ	-	25.8		-		27.9	Gb/s	-
Differential pk-pk Input Voltage	-	900		-		-	mVpp	-
DifferentialTermination Mismatch	-	-		-		10	%	-
Differential Input Return Loss	-	CEI-28G VSRTP1 SDD11					dB	-
Parameter	Symbol	Min	Typ.		Max		Unit	Note
Differential to Common Mode Input Return Loss	-	CEI-28G VSRTP1 SDC11					dB	-
Module Stressed Input Test	-	SeeOIFCEI-03.1					-	-
Receiver
Data Rate, NRZ	-	25.8		-		27.9	Gb/s	-
Differential Pk-Pk Output Voltage	-	750		-		900	mVpp	-
AC Common Mode Output Voltage, RMS	-	-		-		17.5	mV	-
Differential Termination Mismatch	-	-		-		10	%	-
Differential Output Return Loss	-	CEI-28G VSR TP4 SDD22		dB		-
Common to Diff. Mode Conversion Return Loss	-	CEI-28G VSR TP4 SDC22		dB		-
Transition Time, 20% to 80%	-	12		-		-	ps	-
Eye Width @1E-15 Probability (EW15)	-	0.57		-		-	UI	-
Eye Height @1E-15 Probability (EH15)	-	228		-		-	mV	-
Common Mode Return Loss (250MHz to 30GHz)	-	-		-		-2	dB	-
Vertical Eye Closure	-	-		-		5.5	dB	-

Timing of Control and Status

Parameter	Min	Typ.	Max	Unit	Conditions
Mgmtinit Duration			2000	ms	Time from power on1, hot plug or rising edge of reset until until the high to low SDA transition of the Start condition for the first acknowledged TWI transaction
Reset Assert Time		5		us	Minimum pulse time on the ResetL signal to initiate a module reset
Int/RxLOS Mode Change			100	ms	Time to change between IntL and RxLOSL modes of the dual- mode signal IntL/RxLOSL
LPMode/TxDis Mode Change Time			100	ms	Time to change between LPMode and TxDis modes of LPMode/TxDis
IntL Assert Time		40		ms	Time from occurrence of condition triggering IntL until Vout:IntL=Vol
IntL Deassert Time			500	us	Time from occurrence of condition triggering IntL until Vout:IntL=Vol
Rx LOS Assert Time		40		ms	Time from Rx LOS state to Rx LOS bit set(value = 1b) and IntL asserted
TX Disable Assert Time			150	ms	Time from Tx Disable bit set to 1 until optical output falls below 10% of nominal
TX Disable Deassert Time			300	ms	Time from Tx Disable bit cleared to 1 until optical output rises above 90% of nominal
Tx Fault Assert Time			200	ms	Time from Tx Fault state to Tx Fault bit set(value=1b) and IntL asserted