100G 10km QSFP28 LR4 Optical Transceiver

WTQ28-4LR4-10B

WTQ28-4LR4-10B optical Transceiver integrates receiver and transmitter path on one module. In the transmit side, four lanes of serial data streams are recovered, retimed, and passed to four laser drivers. The laser drivers control 4- Distributed Feedback Laser (DFB) with center wavelength of 1296 nm, 1300nm, 1305nm and 1309 nm.

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Product Description

Single-mode,100G,10Km,LC interface

Product Features

* Compliant with 100GBASE-LR4

* Support line rates from 103.125 Gbps to 111.81 Gbps

* Integrated LAN WDM TOSA / ROSA for up to 10 km reach over SMF

* Digital Diagnostics Monitoring Interface

* Duplex LC optical receptacle

* No external reference clock

* Electrically hot-pluggable

* Compliant with QSFP28 MSA with LC connector

* Case operating temperature range:0°C to 70°C

* Power dissipation <3.5W

Applications

* 100G Ethernet &100GBASE-LR4

*ITU-T OTU4

General Description

The optical signals are multiplexed to a single –mode fiber through an industry standard LC connector. In the receive side, the four lanes of optical data streams are optically de-multiplexed by the integrated optical de-multiplexer. Each data stream is recovered by a PIN photo-detector and trans-impedance amplifier, retimed. This module features a hot-pluggable electrical interface, low power consumption and MDIO management interface.

The product is designed with form factor, optical/electrical connection and digital diagnostic interface according to the QSFP28 Multi-Source Agreement (MSA) and compliant to IEEE 802.3bm

Absolute Maximum Ratings

Parameter	Symbol	Min	Max	Unit	Notes
Storage Temperature	TS	-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	Typical	Max	Unit	Notes
Case Operating Temperature	Tcase	0		70	ºC	Without air flow
Power Supply Voltage	VCC	3.135	3.3	3.465	V	Power Supply Voltage
Data Rate, each Lane	BR		25.78125		Gb/s	Data Rate, each Lane
Power Supply Current	ICC			1060	mA
Transmission Distance	TD			10	km
Coupled fiber	Single mode fiber					9/125um SMF

Electrical Characteristics

Parameter	Symbol	Min	Typical	Max	Unit	note
Supply Voltage	Vcc	3.13	3.3	3.47	V
Supply Current	Icc			1060	mA
Transmitter
Input differential impedance	Rin	90	100	110	Ω	1
Differential data input swing	Vin,pp	180		1000	mV
Transmit Disable Voltage	VD	Vcc–1.3		Vcc	V
Transmit Enable Voltage	VEN	Vee	100	Vee+ 0.8	V	2
Receiver
Differential data output swing	Vout,pp	300		850	mV	3
LOS Fault	VLOS fault	Vcc–1.3		VccHOST	V	4
LOS Normal	VLOS norm	Vee		Vee+0.8	V	4

Notes:

Connected directly to TX data input pins. AC coupled thereafter.
Or open circuit.
Into 100 ohms differential termination.
Loss Of Signal is LVTTL. Logic 0 indicates normal operation; logic 1 indicates no signal detected.

Optical Characteristics

Parameter	Symbol	Min	Typical	Max	Unit	Notes
Transmitter
Wavelength Assignment	L0	1294.53	1295.56	1296.59	nm
	L1	1299.02	1300.05	1301.09	nm
	L2	1303.54	1304.58	1305.63	nm
	L3	1308.09	1309.14	1310.19	nm
Total Output. Power	POUT			10.5	dBm
Average Launch Power Per lane		-4.3		4.5	dBm
Spectral Width (-20dB)	σ			1	nm
SMSR		30			dB
Optical Extinction Ratio	ER	4			dB
Average launch Power off per lane	Poff			-30	dBm
RIN	RIN			-128	dB/Hz
Output Eye Mask definition {X1，X2，X3，Y1，Y2，Y3}	{0.25，0.4，0.45，0.25，0.28，0.4}
Receiver
Rx Sensitivity per lane	RSENS			-10.6	dBm	1
LOS De-Assert	LOSD	-30			dBm
LOS Assert	LOSA			-12	dBm
Input Saturation Power (Overload)	Psat			4.5	dBm
Receiver Reflectance	Rr			-26	dB

Note：

1.Measured with a PRBS 231 -1 test pattern, @25.78Gb/s, BER<10-12 .

Pin Assignment and Description

Pin Assignment

PIN	Symbol	Description	Notes
1	GND	Ground	1
2	Tx2n	Transmitter Inverted Data Input
3	Tx2p	Transmitter Non-Inverted Data output
4	GND	Ground	1
5	Tx4n	Transmitter Inverted Data Input
6	Tx4p	Transmitter Non-Inverted Data output
7	GND	Ground	1
8	ModSelL	Module Select
9	ResetL	Module Reset
10	VccRx	+3.3V Power Supply Receiver	2
11	SCL	2-Wire Serial Interface Clock
12	SDA	2-Wire Serial Interface Data
13	GND	Ground
14	Rx3p	Receiver Non-Inverted Data Output
15	Rx3n	Receiver Inverted Data Output
16	GND	Ground	1
17	Rx1p	Receiver Non-Inverted Data Output
18	Rx1n	Receiver Inverted Data Output
19	GND	Ground	1
20	GND	Ground	1
21	Rx2n	Receiver Inverted Data Output
22	Rx2p	Receiver Non-Inverted Data Output
23	GND	Ground	1
24	Rx4n	Receiver Inverted Data Output	1
25	Rx4p	Receiver Non-Inverted Data Output
26	GND	Ground	1
27	ModPrsL	Module Present
28	IntL	Interrupt
29	VccTx	+3.3V Power Supply transmitter	2
30	Vcc1	+3.3V Power Supply	2
31	LPMode	Low Power Mode
32	GND	Ground	1
33	Tx3p	Transmitter Non-Inverted Data Input
34	Tx3n	Transmitter Inverted Data Output
35	GND	Ground	1
36	Tx1p	Transmitter Non-Inverted Data Input
37	Tx1n	Transmitter Inverted Data Output
38	GND	Ground	1

Notes:

GND is the symbol for signal and supply (power) common for QSFP28 modules. All are common within the QSFP28 module and all module voltages are referenced to this potential unless otherwise noted. Connect these directly to the host board signal common ground plane.

VccRx, Vcc1 and VccTx are the receiving and transmission power suppliers and shall be applied concurrently. Recommended host board power supply filtering is shown below. Vcc Rx, Vcc1 and Vcc Tx may be internally connected within the QSFP28 transceiver module in any combination. The connector pins are each rated for a maximum current of 500mA.

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