Allied Telesis AT-QSFPLR4-20-FL Quick Spec:

Part Number: AT-QSFPLR4-20-FL

Text  Description automatically generated with medium confidence

AT-QSFPLR4-20-EXT-FL AT-QSFPLR4-20-IND-FL


Form Factor: QSFP

TX Wavelength: 1270nm-1330nm

Reach: 20km

Cable Type: SMF

Rate Category: 40GBase

Interface Type: CWDM-LR4

DDM: Yes

Connector Type: Dual-LC

Optical Power Budget: 9 dB

TX Power Min/Max: -3 to +2.3 dBm

RX Power Min/Max: -12 to +2.3 dBm


Product Features Allied Telesis AT-QSFPLR4-20-FL


Overview Allied Telesis AT-QSFPLR4-20-FL

The AT-QSFPLR4-20-FL is a transceiver module designed for 20km optical communication applications. The design is compliant to 40GBASE-LR4 of the IEEE P802.3ba standard. The module converts 4 inputs channels of 10Gbps electrical data to 4 CWDM optical signals, and multiplexes them into a single channel for 40Gb/s optical transmission. Reversely, on the receiver side, the module optically de-multiplexes a 40Gb/s input into 4 CWDM channels signals, and converts them

to 4 channel output electrical data. The central wavelengths of the 4 CWDM channels are 1271, 1291, 1311 and 1331 nm as members of the CWDM wavelength grid defined in ITU-T G694.2. It contains a duplex LC connector for the optical interface and a 148-pin connector for the electrical interface. To minimize the optical dispersion in the long-haul system, single-mode fiber (SMF) has to be used. 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.


Functional Diagram

This product converts the 4-channel 10 Gbps electrical input data into CWDM optical signals (light), by a driven 4- wavelength Distributed Feedback Laser (DFB) array. The light is combined by the MUX parts as a 40 Gbps data, propagating out of the transmitter module from the SMF. The receiver module accepts the 40 Gbps CWDM optical signals input, and de-multiplexes it into 4 individual 10Gbps channels with different wavelengths. Each wavelength is collected by a discrete avalanche photodiode (APD), and then outputted as electric data after amplified first by a TIA and then by a post amplifier. 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 7 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.


image

Laser Driver Array (4ch)

DFB

Laser Array (4ch)

Micro- optics

LC duplex connector

Laser Driver

DFB

Laser


Micro-

Array (4ch)

Array (4ch)

optics

Tx3 Tx2 Tx1 Tx0

Rx3 Rx2 Rx1 Rx0

Figure 1. Functional diagram

Serial Clock (SCL) and Serial Data (SDA) are required for the 2-wire serial bus communication interface and enable the host to access the QSFP+ 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 though 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

Parameter

Symbol

Min

Max

Unit

Storage Temperature

Tst

-40

+85

°C

Relative Humidity (non-condensation)

RH

5

85

%

Operating Case Temp (Standard)

Topc

0

70

°C

Operating Case Temp (Industrial)

Topc

-40

85

°C


Recommended Operating Conditions

Parameter

Symbo

l

Min

Typ

Max

Unit

Power Supply Voltage

Vcc


3.15

3.3

3.45

V

Power Supply Current

Icc




1000

mA

Power Dissipation

PD




3.5

W

Aggregate Bit Rate

BRAVE



41.25


Gbps

Lane Bit Rate

BRLANE


10.3125


Gbps


Electrical Characteristics – Transmitter

Parameter

Symbol

Min

Typ

Max

Unit

Notes

Single ended input voltage tolerance


-0.3


4

V

Referred to TP1 signal common

AC common mode input voltage tolerance


15



mV

RMS

Input Impedance (Differential)

Zin

85

100

115

ohms

Rin > 100 kohms @ DC


TX Disable

Disable

VIH

2


Vcc+0.3

V


Enable

VIL

0


0.8




TX FAULT

Fault

VOH

2.4


Vcc+0.3

V


Normal

VOL

0


0.8



Electrical Characteristics - Receiver


Parameter

Symbol

Min

Typ

Max

Unit

Notes

Single ended output voltage


-0.3


4

V

Referred to signal common

AC common mode voltage




7.5

mV

RMS

Termination mismatch at 1MHz




5

%


Output Impedance (Differential)

Zout

85

100

115

ohms


Output Rise/Fall Time

tr/tf

30



ps

10%~90%

LOS

VoH

2.4


Vcc+0.3

V


RX_LOS







Normal

VoL

0


0.8

V



Optical and Electrical Characteristics


Parameter

Symbol

Min

Typ

Max

Unit

SMF

L


20


km

Aggregate Bit Rate

BRAVE


41.25


Gbps

Per Lane Bit Rate

BRLANE


10.3125


Gbps


Optical Characteristics – Transmitter

Parameter

Symbol

Min

Typ

Max

Unit


Channels wavelength


λC

1264.5

1271

1277.5


nm

1284.6

1291

1297.5

1304.5

1311

1317.5

1324.5

1331

1337.5

-20dB spectral width

∆λ



1

Nm

Average Launch Power, Each Lane

Pout/lane

-3


2.3

dBm

Per Lane Bit Rate

Er

3.5




Output Optical Eye


IEEE 802.3ba-2010 Compliant


Optical Characteristics - Receiver


Parameter

Symbol

Min

Typ

Max

Unit


Channels wavelength


λC

1264.5

1271

1277.5


nm

1284.6

1291

1297.5

1304.5

1311

1317.5

1324.5

1331

1337.5

Damage Threshold


3.3



dBm

Receiver sensitivity in OMA, each lane

Pmins



-12

dBm

Maximum Receive Power, each lane

Pmax

2.3



dBm

Receiver reflectance

Rr



-26

Db

LOS De-Assert

LOSD



-11.5

dBm

LOS Assert

LOSA

-20



dBm


PIN Assignment and Function Definitions

PIN Assignment


Allied Telesis AT-QSFPLR4-20-FL Datasheet (40GBase, LR4, QSFP+, SMF, 20km, Dual-LC, COM, EXT, IND) Fiber Optic Transceiver


PIN Definition

PIN

Signal Name

Description

1

GND

Ground (1)

2

Tx2n

CML-I Transmitter 2 Inverted Data Input

3

Tx2p

CML-I Transmitter 2 Non-Inverted Data Input

4

GND

Ground (1)

5

Tx4n

CML-I Transmitter 4 Inverted Data Input

6

Tx4p

CML-I Transmitter 4 Non-Inverted Data Input

7

GND

Ground (1)

8

ModSelL

LVTLL-I Module Select

9

ResetL

LVTLL-I Module Reset

10

VCCRx

+3.3V Power Supply Receiver (2)

11

SCL

LVCMOS-I/O 2-Wire Serial Interface Clock

12

SDA

LVCMOS-I/O 2-Wire Serial Interface Data

13

GND

Ground (1)

14

Rx3p

CML-O Receiver 3 Non-Inverted Data Output

15

Rx3n

CML-O Receiver 3 Inverted Data Output

16

GND

Ground (1)

17

Rx1p

CML-O Receiver 1 Non-Inverted Data Output

18

Rx1n

CML-O Receiver 1 Inverted Data Output

19

GND

Ground (1)

20

GND

Ground (1)

21

Rx2n

CML-O Receiver 2 Inverted Data Output

22

Rx2p

CML-O Receiver 2 Non-Inverted Data Output

23

GND

Ground (1)

24

Rx4n

CML-O Receiver 4 Inverted Data Output

25

Rx4p

CML-O Receiver 4 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

31

LPMode

LVTLL-I Low Power Mode

32

GND

Ground (1)

33

Tx3p

CML-I Transmitter 3 Non-Inverted Data Input

34

Tx3n

CML-I Transmitter 3 Inverted Data Input

35

GND

Ground (1)

36

Tx1p

CML-I Transmitter 1 Non-Inverted Data Input

37

Tx1n

CML-I Transmitter 1 Inverted Data Input

38

GND

Ground (1)

Notes:

  1. All Ground (GND) are common within the QSFP+ module and all module voltages are referenced to this potential unless noted otherwise. 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. The connector pins are each rated for a maximum current of 500mA.


Licensing

The following U.S. patents are licensed by Allied Telesis 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