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      Position:Home - Products
      EPON OLT MODULE
      Date:2018-10-18 14:11:42 | Visits:


      1. GENERAL DESCRIPTION

      This 1490nm DFB  EPON OLT SFP transceiver is designed to transmit and receive optical data over single mode optical fiber for link length 20km.  

      The transmitter input and receiver output impedance is 100 Ohms differential.  Data lines are internally AC coupled.  The module provides differential termination and reduce differential to common mode conversion for quality signal termination and low EMI.  

      The transmitter converts 1.25Gbit/s serial CML electrical data into serial optical data compliant with the 10GBASE-LR standard.  An open collector compatible Transmit Disable (Tx_Dis) is provided.  A logic “1,” or no connection on this pin will disable the laser from transmitting.  A logic “0” on this pin provides normal operation.  The transmitter has an internal automatic power control loop (APC) to ensure constant optical power output across supply voltage and temperature variations.  An open collector compatible Transmit Fault (TFault) is provided.  TX_Fault is a module output contact that when high, indicates that the module transmitter has detected a fault condition related to laser operation or safety.  The TX_Fault output contact is an open drain/collector and shall be pulled up to the Vcc_Host in the host with a resistor in the range 4.7-10 kΩ.   TX_Disable is a module input contact. When TX_Disable is asserted high or left open, the SFP+ module transmitter output shall be turned off. This contact shall be pulled up to VccT with a 4.7 kΩ to 10 kΩ resistor

      The receiver converts 1.25Gbit/s serial optical data into serial PECL electrical data.  An open collector compatible Loss of Signal is provided.  Rx_LOS when high indicates an optical signal level below that specified in the relevant standard.  The Rx_LOS contact is an open drain/collector output and shall be pulled up to Vcc_Host in the host with a resistor in the range 4.7-10 kΩ, or with an active termination.  Power supply filtering is recommended for both the transmitter and receiver.   The Rx_LOS signal is intended as a preliminary indication to the system in which the SFP is installed that the received signal strength is below the specified range. Such an indication typically points to non-installed cables, broken cables, or a disabled, failing or a powered off transmitter at the far end of the cable.

       

      Features

       

      l 1.25Gb/s serial optical interface compliant to 802.3AH  specifications  small form factor pluggable module “SFP”

      l 1490 nm DFB  transmitter, 1310 nm APD  photo-detector BURST receiver

      l 2-wire interface for management specifications compliant with SFF 8472 digital diagnostic monitoring interface for optical transceivers

      l Operating case temperature: 0 to 70 °C or-40 to 85 °C

      l All-metal housing for superior EMI performance

      l Low power consumption

      l Cost effective OLT solution,

      l RoHS compliant


      Applications

       

      · GEPON  networks

      · FTTX

      2. PROPOSED APPLICATION SCHEMATICS

       

       

       

       

      3. PIN DEFINITION

      The SFP modules are hot-pluggable.  Hot pluggable refers to plugging in or unplugging a module while the host board is powered.  The SFP host connector is a 0.8 mm pitch 20 position right angle improved connector specified by SFF-8083, or stacked connector with equivalent with equivalent electrical performance.   Host PCB contact assignment is shown in Figure 2 and contact definitions are given in Table 2.   SFP module contacts mates with the host in the order of ground, power, followed by signal as illustrated by Figure 3 and the contact sequence order listed in Table 2.

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

      PIN

      Logic

      Symbol

      Name / Description

      Note

      1

       

      VeeT

      Module Transmitter Ground

      1

      2

      LVTTL-O

      TX_Fault

      Module Transmitter Fault

       

      3

      LVTTL-I

      TX_Dis

      Transmitter Disable; Turns off transmitter laser output

       

      4

      LVTTL-I/O

      SDA

      2-Wire Serial Interface Data Line

      2

      5

      LVTTL-I

      SCL

      2-Wire Serial Interface Clock

      2

      6

       

      MOD_DEF0

      Module Definition, Grounded in the module

       

      7

      LVTTL-I

      RS0

      Receiver Rate Select

       

      8

      LVTTL-O

      RX_LOS

      Receiver Loss of Signal Indication Active LOW

       

      9

      LVTTL-I

      RS1

      Transmitter Rate Select (not used)

       

      10

       

      VeeR

      Module Receiver Ground

      1

      11

       

      VeeR

      Module Receiver Ground

      1

      12

      LVPECL-O

      RD-

      Receiver Inverted Data Output

       

      13

      LVPECL-O

      RD+

      Receiver Data Output

       

      14

       

      VeeR

      Module Receiver Ground

      1

      15

       

      VccR

      Module Receiver 3.3 V Supply

       

      16

       

      VccT

      Module Receiver 3.3 V Supply

       

      17

       

      VeeT

      Module Transmitter Ground

      1

      18

      CML-I

      TD+

      Transmitter Non-Inverted Data Input

       

      19

      CML-I

      TD-

      Transmitter Inverted Data Input

       

      20

       

      VeeT

      Module Transmitter Ground

      1

      Table 2: OLT SFP Module PIN Definition

      Note:

      1. Module ground pins GND are isolated from the module case.

      2. Shall be pulled up with 4.7K-10Kohms to a voltage between 3.15V and 3.45V on the host board.

       

      4. TRANSCEIVER BLOCK DIAGRAM

       

       

       

       

       

       

       

       

       

       

       

      5. ABSOLUTE MAXIMUM RATING

      These values represent the damage threshold of the module.  Stress in excess of any of the individual Absolute Maximum Ratings can cause immediate catastrophic damage to the module even if all other parameters are within Recommended Operating Conditions.

       

      Parameters

      Symbol

      Min.

      Max.

      Unit

      Power Supply Voltage

      VCC

      0

      3.6

      V

      Storage Temperature

      Tc

      -40

      85

      °C

       

      Operating Case Temperature

      Tc

      0

      70

       

      °C

      TI

      -40

      85

      Relative Humidity

      RH

      5

      95

      %

      RX Input Average Power

      Pmax

      -

      -7

      dBm

       

       

       

      6. RECOMMENDED OPERATING ENVIRONMENT

      Recommended Operating Environment specifies parameters for which the electrical and optical characteristics hold unless otherwise noted.

       

      Parameters

      Symbol

      Min.

      Typical

      Max

      Unit

      Power Supply Voltage

      VCC

      3.135

      3.3

      3.465

      V

      Power Supply Current

      Icc

       

       

      350

      mA

      Operating Case Temperature

      TC

      0

      25

      70

      °C

      TI

      -40

      25

      85

       

      Table 4: Recommended Operating Environment

       

       

       

      7. OPTICAL CHARACTERISTICS

      The following optical characteristics are defined over the Recommended Operating Environment unless otherwise specified.

       

      Parameters

      Unit

      Values

      Operating Reach

      m

      2 - 20K

      Transmitter

      Center wavelength

      nm

      1490

      Side Mode Suppression Ratio (min)

      dB

      30

      Launched power

                – maximum (Average)

      dBm

      9

                – minimum (Average)

      dBm

      7

      Average launch power of OFF transmitter (max)

      dBm

      -30

      Extinction ratio (min)

      dB

      9

      Optical Return Loss Tolerance (min)

      dB

      12

      Receiver

      Center wavelength (range)

      nm

      1310

      Receive overload (max) in average power(note 1)

      dBm

      -8

      Receive sensitivity (min) in average power(note 1)

      dBm

      -32

      Receiver Reflectance (max)

      dB

      -12

      Los Assert(min)

      dBm

      -33

      Los Dessert(max)

      dBm

              -30

      Los Hysteresis(min)

      dB

      0.5

      Receiver power (damage, Max)

      dBm

      -7

       

      Notes:

      1. Average optical power shall be measured using the methods specified in TIA/EIA-455-95.

       

       

      2. Power budget is defined as the different between the Rx sensitivity and the Tx output power of the interface.

       

       

      Table 5: Optical Characteristics

       

      8. DITITAL DIAGNOSTIC FUNCTIONS

      The following digital diagnostic characteristics are defined over the Recommended Operating Environment unless otherwise specified. It is compliant to SFF8472 Rev10.2 with internal calibration mode. For external calibration mode please contact our sales stuff.

       

      Parameter

      Symbol

      Min.

      Max

      Unit

      Notes

      Temperature monitor absolute error

      DMI_Temp

      -3

      3

      degC

      Over operating temp

      Laser power monitor absolute error

      DMI_TX

      -3

      3

      dB

       

      Supply voltage monitor absolute error

      DMI_VCC

      -0.08

      0.08

      V

      Full operating range

      Bias current monitor

      DMI_Ibias

      -10%

      10%

      mA

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

       

      9. ELECTRICAL CHARACTERISTICS

      The following electrical characteristics are defined over the Recommended Operating Environment unless otherwise specified.

      Parameter

      Symbol

      Min.

      Typical

      Max

      Unit

      Notes

      Data Rate

       

      -

      1.25

      -

      Gbps

       

      Power Consumption

       

      -

      800

      1000

      mW

       

      Transmitter

      Single Ended Output Voltage Tolerance

       

      -0.3

      -

      4

      V

       

      Common mode voltage tolerance

       

      15

      -

      -

      mV

       

      Tx Input Diff Voltage

      VI

      180

       

      1200

      mV

       

      Tx Fault

      VoL

      -0.3

       

      0.4

      V

      At 0.7mA

      Data Dependent Input Jitter

      DDJ

       

       

      0.1

      UI

       

      Data Input Total Jitter

      TJ

       

       

      0.28

      UI

       

      Receiver

      Single Ended Output Voltage Tolerance

       

      -0.3

      -

      4

      V

       

      Rx Output Diff Voltage

      Vo

      300

       

      1000

      mV

       

      LOS Assert Time

      TAssert

      -

      -

      500

      ns

      LOS Assert Time   

      LOS De-assert Time

      TDeassert

      -

      -

      500

      ns

      LOS De-assert Time  

      Receiver Threshold Settling Time

      TSETTLING

       

       

      250

      ns

      Figure 3

       

       

       

       

       

       

       

      10. Burst Mode Receiver Dynamic Range

       

       

       

       

       

       

       

       

       

       

       

       

      11.Timing Parameter Definitions in Burst Mode Sequence

       

       

       

      Figure 3 Timing Parameter Definitions in Burst Mode Sequence

       

       

       

       

       

       

       

       

       

      12. MECHANICAL

       

       

       

       

      Table 10: Key Mechanical Dimensions

       

      13. ESD

       

      This transceiver is specified as ESD threshold 2kV for all electrical input pins, 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.   

       

       

      14. LASER SAFTY

       

      This is a Class 1 Laser Product according to IEC 60825-1:1993:+A1:1997+A2:2001.  This product complies with 21 CFR 1040.10 and 1040.11 except for deviations pursuant to Laser Notice No. 50, dated (July 26, 2001)

       

       

       

       

       

       

       

       

      14.  Order Information

       

      D

      ET

      2

      -

      49

      24

      -

      2

      C

      Y

      2

      +++

       

       

       

       

       

       

      ODI

       

       

       

       

       

       

      EPON

      OLT

       

       

       

      single Fiber

       

       

       

       

       

       

      -

       

       

      27

      Tx:1270

       DFB

       

       

       

       

       

      1.25

      GBPs

       

       

       

       

       

       

      -

       

      Distance

      0:2km

      1:10km

      2: 20km

      4:40km

       

       

       

       

      C

       

      0~+70

      °C

      Y

      With

      DDMI

       

       

      1

       

       

      LC/PC

       

       

       

       

       

       

      Customer

      Information

       

       

      33

      Tx:1330

       

      DFB

       

       

      E

       

      -20~+85

      °C

      N: Without

      DDMI

       

       

      2

       

       

      SC/PC

       

       

      49

       

      1490DFB

       

       

      I

       

      -40~+85

      °C

       

       

      -

       

       

      3

       

       

      SC/APC

       

       

      Revision  History:                                                                               Rev. 0.0

      Previous  Version:            

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      Subjects (major changes since last revision)

       

       


       
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