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120km Reach 2.67Gbps CWDM SFP Optical Transceiver
The CWDM SFP transceivers are high performance,cost effective modules supporting data-rate of 2.67Gbps and 120km transmission distance with SMF. The transceiver consists of three sections: an uncooled CWDM DFB laser transmitter, an APD photodiode integrated with a trans-impedance preamplifier (TIA) and MCU control unit. All modules satisfy class I laser safety requirements. The transceivers are compatible with SFP Multi-Source Agreement (MSA) and SFF-8472. For further information, please refer to SFP MSA.

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INFORMATION

Features

¨        Data-rate of 2.67Gbps operation

¨        8 CWDM DFB wavelengths laser and APD photodetector for 120km transmission

¨        Compliant with SFP MSA and SFF-8472 with duplex LC receptacle

¨        Digital Diagnostic Monitoring:

Internal Calibration or External Calibration

¨        Compatible with RoHS

¨        +3.3V single power supply

¨        Operating case temperature:

Standard :  0 to +70°C

 

Applications

¨        SDH STM-16 and SONET OC-48 system

¨        2X Fiber Channel

¨        Switch to Switch interface

¨        Switched backplane applications

¨        Router/Server interface

¨        Other optical transmission systems

 

Description

 

The SFP transceivers are high performance, cost effective modules supporting data-rate of 2.67Gbps and 120km transmission distance with SMF.

 

The transceiver consists of three sections: an uncooled CWDM DFB laser transmitter, an APD photodiode integrated with a trans-impedance preamplifier (TIA) and MCU control unit. All modules satisfy class I laser safety requirements.

 

The transceivers are compatible with SFP Multi-Source Agreement (MSA) and SFF-8472. For further information, please refer to SFP MSA.

 

 

 Module Block Diagram

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Absolute Maximum Ratings

Table 1 - Absolute Maximum Ratings

Parameter

Symbol

Min

Max

Unit

Supply Voltage

Vcc

-0.5

4.5

V

Storage Temperature

Ts

-40

+85

°C

Operating Humidity

-

5

85

%

 

 Recommended Operating Conditions

Table 2 - Recommended Operating Conditions

Parameter

Symbol

Min

Typical

Max

Unit

Operating Case Temperature

Standard

Tc

0

 

+70

°C

Power Supply Voltage

Vcc

3.13

3.3

3.47

V

Power Supply Current

Icc

 

 

300

mA

Data Rate

 

 

2.67

 

Gbps

 

BD-XX48-08CD

 

See table3 below for “xx” values

Table3 -λC Wavelength Guide

 

λC Wavelength Guide

Code

λC

Unit

Code

λC

Unit

47

1470

nm

57

1570

nm

49

1490

nm

59

1590

nm

51

1510

nm

61

1610

nm

53

1530

nm

 

 

 

55

1550

nm

 

 

 

 

Optical and Electrical Characteristics

BD-XX48-08CD: (CWDM and APD, 120km Reach)

Table 4 - Optical and Electrical Characteristics

Parameter

Symbol

Min

Typical

Max

Unit

Notes

Transmitter

Centre Wavelength

λc

λc-6.5

λc

λc+6.5

nm

 

Spectral Width (-20dB)

∆λ

 

 

1

nm

 

Side Mode Suppression Ratio

SMSR

30

 

 

dB

 

Average Output Power

Pout

0

 

5

dBm

1

Extinction Ratio

ER

9

 

 

dB

 

Optical Rise/Fall Time (20%~80%)

tr/tf

 

 

150

ps

 

Data Input Swing Differential

VIN

400

 

1800

mV

2

Input Differential Impedance

ZIN

90

100

110

Ω

 

TX Disable

Disable

 

2.0

 

Vcc

V

 

Enable

 

0

 

0.8

V

 

TX Fault

Fault

 

2.0

 

Vcc

V

 

Normal

 

0

 

0.8

V

 

Receiver

Receiver Sensitivity

 

 

 

-28

dBm

3

Receiver Overload

 

-9

 

 

dBm

3

LOS De-Assert

LOSD

 

 

-30

dBm

 

LOS Assert

LOSA

-40

 

 

dBm

 

LOS Hysteresis

 

1

 

4

dB

 

Data Output Swing Differential

Vout

370

 

1800

mV

4

LOS

High

2.0

 

Vcc

V

 

Low

 

 

0.8

V

 

Notes:

1. The optical power is launched into SMF.

2. PECL input, internally AC-coupled and terminated.

3. Measured with a PRBS 223-1 test pattern @2488Mbps, BER ≤1×10-12.

4. Internally AC-coupled.

 

 Timing and Electrical

 

Table 5 - Timing and Electrical

 

Parameter

Symbol

Min

Typical

Max

Unit

Tx Disable Negate Time

t_on

 

 

1

ms

Tx Disable Assert Time

t_off

 

 

10

μs

Time To Initialize, including Reset of Tx Fault

t_init

 

 

300

ms

Tx Fault Assert Time

t_fault

 

 

100

μs

Tx Disable To Reset

t_reset

10

 

 

μs

LOS Assert Time

t_loss_on

 

 

100

μs

LOS De-assert Time

t_loss_off

 

 

100

μs

Serial ID Clock Rate

f_serial_clock

 

 

400

KHz

MOD_DEF (0:2)-High

VH

2

 

Vcc

V

MOD_DEF (0:2)-Low

VL

 

 

0.8

V

 

 

Diagnostics

Table 5 – Diagnostics Specification

Parameter

Range

Unit

Accuracy

Calibration

Temperature

0 to +70

°C

±3°C

Internal / External

Voltage

3.0 to 3.6

V

±3%

Internal / External

Bias Current

0 to 100

mA

±10%

Internal / External

TX Power

0 to +5

dBm

±3dB

Internal / External

RX Power

-30 to -9

dBm

±3dB

Internal / External

 

 Digital Diagnostic Memory Map

The transceivers provide serial ID memory contents and diagnostic information about the present operating conditions by the 2-wire serial interface (SCL, SDA).

 

The diagnostic information with internal calibration or external calibration all are implemented, including received power monitoring, transmitted power monitoring, bias current monitoring, supply voltage monitoring and temperature monitoring.

 

The digital diagnostic memory map specific data field defines as following.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pin Definitions

Pin Diagram

 

 

Pin Descriptions

 

Pin

Signal Name

Description

Plug Seq.

Notes

1

VEET

Transmitter Ground

1

 

2

TX FAULT

Transmitter Fault Indication

3

Note 1

3

TX DISABLE

Transmitter Disable

3

Note 2

4

MOD_DEF(2)

SDA Serial Data Signal

3

Note 3

5

MOD_DEF(1)

SCL Serial Clock Signal

3

Note 3

6

MOD_DEF(0)

TTL Low

3

Note 3

7

Rate Select

Not Connected

3

 

8

LOS

Loss of Signal

3

Note 4

9

VEER

Receiver ground

1

 

10

VEER

Receiver ground

1

 

11

VEER

Receiver ground

1

 

12

RD-

Inv. Received Data Out

3

Note 5

13

RD+

Received Data Out

3

Note 5

14

VEER

Receiver ground

1

 

15

VCCR

Receiver Power Supply

2

 

16

VCCT

Transmitter Power Supply

2

 

17

VEET

Transmitter Ground

1

 

18

TD+

Transmit Data In

3

Note 6

19

TD-

Inv. Transmit Data In

3

Note 6

20

VEET

Transmitter Ground

1

 

Notes:

Plug Seq.: Pin engagement sequence during hot plugging.

1) TX Fault is an open collector output, which should be pulled up with a 4.7k~10kΩ resistor on the host board to a voltage between 2.0V and Vcc+0.3V. Logic 0 indicates normal operation; Logic 1 indicates a laser fault of some kind. In the low state, the output will be pulled to less than 0.8V.

2) TX Disable is an input that is used to shut down the transmitter optical output. It is pulled up within the module with a 4.7k~10kΩ resistor. Its states are:

Low (0 to 0.8V):             Transmitter on

(>0.8V, < 2.0V):             Undefined

High (2.0 to 3.465V):         Transmitter Disabled

Open:                      Transmitter Disabled

3) Mod-Def 0,1,2. These are the module definition pins. They should be pulled up with a 4.7k~10kΩ resistor on the host board. The pull-up voltage shall be VccT or VccR.

Mod-Def 0 is grounded by the module to indicate that the module is present

Mod-Def 1 is the clock line of two wire serial interface for serial ID

Mod-Def 2 is the data line of two wire serial interface for serial ID

4) LOS is an open collector output, which should be pulled up with a 4.7k~10kΩ resistor. Pull up voltage between 2.0V and Vcc+0.3V. Logic 1 indicates loss of signal; Logic 0 indicates normal operation. In the low state, the output will be pulled to less than 0.8V.

5) RD-/+: These are the differential receiver outputs. They are internally AC-coupled 100 differential lines which should be terminated with 100Ω (differential) at the user SERDES.

6) TD-/+: These are the differential transmitter inputs. They are internally AC-coupled, differential lines with 100Ω differential termination inside the mod

 

 

 Recommended Interface Circuit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


Mechanical Dimensions

 


 

 Regulatory Compliance

BAUDCOM SFP transceiver is designed to be Class I Laser safety compliant and is certified per the following standards

 

Feature

Agency

Standard

Certificate / Comments

Laser Safety

FDA

CDRH 21 CFR 1040 annd Laser Notice No. 50

1120294-000

Product Safety

BST

EN 60825-12007

EN 60825-22004

EN 60950-12006

BT0905142002

Environmental protection

SGS

RoHS Directive 2002/95/EC

GZ0902008346/CHEM

EMC

CCIC

EN 550222006+A12007

EN 550241998+A12001+A22003

CTE09050018

 

 

 

 




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