QSFP28-100GBase-LR1 Quick Spec:

Part Number: QSFP28-100GBase-LR1

QSFP28-100GBase-LR1-EXT QSFP28-100GBase-LR1-IND

Form Factor: QSFP28 TX Wavelength: 1310nm Reach: 10km

Cable Type: SMF Rate Category: 100G Interface Type: LR1 DDM: Yes

Connector Type: Dual-LC

QSFP28-100GBase-LR1 Features

• QSFP28 MSA compliant

• Supports 53.125Gbaud

• 100G Lambda MSA 100G-LR Specification compliant

• Up to 10km transmission on single mode fiber (SMF) with FEC

• 4x25G electrical interface (OIF CEI-28G- VSR)

• Maximum power consumption 4.5W

• LC duplex connector

• RoHS compliant

• Operating Case Temperature

  • Standard: 0℃ to +70℃

  • Extended: -5℃ to 85℃

  • Industrial: -40℃ to +85℃

    
    

    QSFP28-100GBase-LR1 Applications

• Data Center Interconnect

• 100G Ethernet

• Enterprise networking

Product Description

This product is a transceiver module designed for 10km optical communication applications. The module incorporates one channel optical signal, on 1310nm center wavelength, operating at 50Gbaud data rate. The transmitter path incorporates an EML Driver and a cooled EML together. On the receiver path, the input optical signal is coupled to a Pin photodiode detector. A DSP based gearbox is used to convert 4x25Gbps NRZ signals to 1x50Gbaud PAM4 signal. Also, a 4-channel retimer and FEC block are integrated in this DSP. The electrical interface is compliant with IEEE 802.3cd and QSFP28 MSA in the transmitting and receiving directions, and optical interface is compliant to IEEE 802.3cd and 100G Lambda MSA with Duplex LC connector. The module has a maximum power consumption of 4.5W.

The product is designed with form factor, optical/electrical connection, and digital diagnostic interface according to the QSFP28 Multi-Source Agreement (MSA). It has been designed to meet the harshest external operating conditions including temperature, humidity, and EMI interference.

Functional Description

This product converts the 4-channel of 100Gbps aggregated NRZ electrical input data into one channel of 50Gbaud PAM4 optical signal (light) on 1310nm center wavelength through a DSP based gearbox, by a driven cooled Electro- absorption Modulated DFB Laser (EML). The light propagates out of the transmitter into an SMF fiber. The receiver module accepts the 50Gbaud PAM4 optical signal input, and converts it into a 50Gbaud PAM4 electrical signal via a linear amplifier. And then convert the 50Gbaud PAM4 signal into 4 channels of 25Gbps NRZ signals. Figure 1 shows the functional block diagram of this product.

A single +3.3V power supply is required to power up this product. Both power supply pins VccTx and VccRx are internally connected and should be applied concurrently. As per MSA specifications the module offers seven low speed hardware control pins (including the 2-wire serial interface): ModSelL, SCL, SDA, ResetL, LPMode, ModPrsL and IntL.

Module Select (ModSelL) is an input pin. When held low by the host, this product responds to 2- wire serial communication commands. The ModSelL allows the use of this product on a single 2- wire interface bus – individual ModSelL lines must be used.

Serial Clock (SCL) and Serial Data (SDA) are required for the 2-wire serial bus communication interface and enable the host to access the memory map.

The ResetL pin enables a complete reset, returning the settings to their default state, when a low level on the ResetL pin is held for longer than the minimum pulse length. During the execution of a reset the host shall disregard all status bits until it indicates a completion of the reset interrupt. The product indicates this by posting an IntL (Interrupt) signal with the Data_Not_Ready bit negated in the memory map. Note that on power up (including hot insertion) the module should post this completion of reset interrupt without requiring a reset.

Low Power Mode (LPMode) pin is used to set the maximum power consumption for the product in order to protect hosts that are not capable of cooling higher power modules, should such modules be accidentally inserted.

Module Present (ModPrsL) is a signal local to the host board which, in the absence of a product, is normally pulled up to the host Vcc. When the product is inserted into the connector, it completes the path to ground through a resistor on the host board and asserts the signal. ModPrsL then indicates its present by setting ModPrsL to a “Low” state.

Interrupt (IntL) is an output pin. “Low” indicates a possible operational fault or a status critical to the host system. The host identifies the source of the interrupt using the 2-wire serial interface. The IntL pin is an open collector output and must be pulled to the Host Vcc voltage on the Host board.

ABSOLUTE MAXIMUM RATINGS

The operation in excess of any absolute maximum ratings might cause permanent damage to this module.

RECOMMENDED OPERATING CONDITIONS

Notes:

1. FEC feature is embedded in the module.

2. FEC required to be turned on to support maximum transaction distance.

   Electrical Characteristics

   
   

   Parameter	Test Point	Min	Typical	Max	Unit	Notes
   Power Consumption				4.5	W
   Supply Current	Icc			1.36	A
   Transmitter (each Lane)
   Overload Differential Voltage pk-pk	TP1a	900			mV
   Common Mode Voltage (Vcm)	TP1	-350		2850	mV	1
   Differential Termination Resistance Mismatch	TP1			10	%	At 1MHz
   Differential Return Loss (SDD11)	TP1			See CEI- 28G- VSR Equation 13-19	dB
   Common Mode to Differential conversion and Differential to Common Mode conversion (SDC11, SCD11)	TP1			See CEI- 28G- VSR Equation 13-20	dB
   Stressed Input Test	TP1a	See CEI- 28G- VSR Section 13.3.11.2. 1
   Receiver (each Lane)	Zout	90	100	110	Ohm
   Differential Voltage, pk-pk	TP4			900	mV
   Common Mode Voltage (Vcm)	TP4	-350		2850	mV	1
   Common Mode Noise, RMS	TP4			17.5	mV
   Differential Termination Resistance Mismatch	TP4			10	%	At 1MHz
   Differential Return Loss (SDD22)	TP4			See CEI- 28G- VSR Equation 13-19	dB
   Common Mode to Differential conversion and Differential to Common Mode conversion (SDC22, SCD22)	TP4			See CEI- 28G- VSR Equation 13-21	dB
   Common Mode Return Loss (SCC22)	TP4			-2	dB	2
   Transition Time, 20 to 80%	TP4	9.5			ps
   Vertical Eye Closure (VEC)	TP4			5.5	dB
   Eye Width at 10-15 probability (EW15)	TP4	0.57			UI
   Eye Height at 10-15 probability (EH15)	TP4	228			mV

   Notes:

   1. Vcm is generated by the host. Specification includes effects of ground offset voltage.

   2. From 250MHz to 30GHz.

Optical Characteristics

Notes:

1. Average launch power, each lane min is informative and not the principal indicator of signal strength. A transmitter with launch power below this value cannot be compliant; however, a value above this does not ensure compliance

2. Even if the TDECQ < 1.4dB for an extinction ratio of ≥ 4.5dB or TDECQ < 1.3dB for an extinction ratio of < 4.5dB, the OMAouter (min) must exceed the minimum value specified here.

3. The receiver shall be able to tolerate, without damage, continuous exposure to a modulated optical input signal having this power level on one lane. The receiver does not have to operate correctly at this input power.

4. Stressed eye closure definition is test condition for measuring stressed receiver sensitivity. It is not a characteristic of the receiver.

   Digital Diagnostic Functions

   The following digital diagnostic characteristics are defined over the normal operating conditions unless otherwise specified.

   
   

   Parameter	Symbol	Min	Max	Unit	Notes
   Temperature monitor absolute error	DMI_Temp	-3	3	degC	Over operating temperature range
   Supply voltage monitor absolute error	DMI _VCC	-0.1	0.1	V	Over full operating range
   Channel RX power monitor absolute error	DMI_RX_Ch	-2	2	dB	1
   Channel Bias current monitor	DMI_Ibias_Ch	-10%	10%	mA
   Channel TX power monitor absolute error	DMI_TX_Ch	-2	2	dB	1

   Notes:

   1. Due to measurement accuracy of different single mode fibers, there could be an additional +/-1 dB fluctuation, or a +/- 3 dB total accuracy

      
      

      PIN Assignment and Description

      
      

      

      Figure 2. MSA Compliant Connector

      
      

      
      

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

      
      

      Notes:

      1. 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.

      2. VccRx, Vcc1 and VccTx are the receiving and transmission power suppliers and shall be applied concurrently. Recommended host board power supply filtering is shown in Figure

      3. 3 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 1000mA.

Recommended Power Supply Filter

Mechanical Dimension

Figure 3. Recommended Power Supply Filter

ESD

This transceiver is specified as ESD threshold 1kV for SFI APDs and 2kV for all other electrical input APDs, tested per MIL- STD-883, Method 3015.4 /JESD22-A114-A (HBM). However, normal ESD precautions are still required during the handling of this module. This transceiver is shipped in ESD protective packaging. It should be removed from the packaging and handled only in an ESD protected environment.

Laser Safety

This is a Class 1 Laser Product according to IEC 60825-1:2007. This product complies with 21 CFR 1040.10 and 1040.11 except for deviations pursuant to Laser Notice No. 50, dated (June 24, 2007).

Licensing

The following U.S. patents are licensed by Finisar to FluxLight, Inc.:

U.S. Patent Nos: 7,184,668, 7,079,775, 6,957,021, 7,058,310, 6,952,531, 7,162,160, 7,050,720