Products+

    1.25Gbps 1310nm 40km SFP Compatible Optical Transceiver

    ST- OC24-40, 1.25Gbps 1310nm SFP Optical Transceiver, 40km LC reach, fully tested compatible for over 100 vendors.

    Features

    1. Data-rate of 1.25Gbps operation

    2. 1310nm DFB laser and PIN photodetector for 40km transmission

    3. Compliant with SFP MSA and SFF-8472 with duplex LC receptacle

    4. Digital Diagnostic Monitoring:

      Internal Calibration or External Calibration

    5. Compatible with SONET OC-24-LR-1

    6. Compatible with RoHS

    7. +3.3V single power supply

    8. Operating case temperature:

    Standard:  0 to +70°C

    Extended :  -40 to +85°C

     

     

    Applications

    1. Gigabit Ethernet

    2. Fiber Channel

    3. Switch to Switch interface

    4. Switched back plane applications

    5. Router/Server interface

    6. Other optical transmission systems

     

     

    Description

    The SFP transceivers are high performance, cost effective modules supporting data-rate of 1.25Gbps and 40km transmission distance with SMF.

    The transceiver consists of three sections: a DFB laser transmitter, a PIN 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.

    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

    Extended

    -20

     

    +85

    °C

    Power Supply Voltage

    Vcc

    3.13

    3.3

    3.47

    V

    Power Supply Current

    Icc

     

     

    300

    mA

    Data Rate

     

     

    1.25

     

    Gbps

     

    Table 3 - Optical and Electrical Characteristics

    Parameter

    Symbol

    Min

    Typical

    Max

    Unit

    Notes

    Transmitter

    Centre Wavelength

    λc

    1260

    1310

    1360

    nm

     

    Spectral Width (-20dB)

    ∆λ

     

     

    1

    nm

     

    Side Mode Suppression Ratio

    SMSR

    30

     

     

    dB

     

    Average Output Power

    Pout

    -5

     

    0

    dBm

    1

    Extinction Ratio

    ER

    9

     

     

    dB

     

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

    tr/tf

     

     

    0.26

    ns

     

    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

    Centre Wavelength

    λc

    1260

     

    1580

    nm

     

    Receiver Sensitivity

     

     

     

    -23

    dBm

    3

    Receiver Overload

     

    -3

     

     

    dBm

    3

    LOS De-Assert

    LOSD

     

     

    -24

    dBm

     

    LOS Assert

    LOSA

    -30

     

     

    dBm

     

    LOS Hysteresis

     

    1

     

    4

    dB

     

    Data Output Swing Differential

    Vout

    400

     

    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 27-1 test pattern @1250Mbps, BER ≤1×10-12.
    4. Internally AC-coupled.

    Timing and Electrical

     

    Table 4 - 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

    -20 to +85

    Voltage

    3.0 to 3.6

    V

    ±3%

    Internal / External

    Bias Current

    0 to 100

    mA

    ±10%

    Internal / External

    TX Power

    -5 to 0

    dBm

    ±3dB

    Internal / External

    RX Power

    -23 to -3

    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.

     

     

    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 module.

     

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