RoHS Compliant
1550 nm Single-mode Transceiver, 32dB margin(120km)
Small Form Pluggable (SFP), with Diagnostic Monitoring
1.0625Gbd Fiber Channel/1.25 Gigabit EthernetFeatures
 RoHS compliant
 Compliant with IEEE802.3z Gigabit Ethernet
Standard
 Compliant with Fiber Channel 100-SM-LL-L
standard
 Compliant with SFF8472 diagnostic monitoring
interface Duplex LC connector
 Differential LVPECL inputs and outputs
 Single power supply 3.3V
 TTL signal detect indicator Hot Pluggable Class 1 laser product complies with EN 60825-1

Ordering Information
PART NUMBERINPUT/OUTPUT

SIGNAL DETECTVOLTAGETEMPERATURE

GD1550-SFP-LC120(WT) AC/AC

TTL

3.3V

-40C to 85 C

GD1550-SFP-LC120

AC/AC

TTL

3.3V

0C to 70 C

Range

Accuracy

Unit

Calibration

Diagnostics
Parameter
Temperature-40 to 95±3oVoltage0 to VCC± 0.1

V

Bias Current

0 to 120±5mA

TX Power-3 to +6± 3 dB

dBm

RX Power-30 to –10± 3 dBdBm

Page 1 of 8
Version 1.4
Date:07/07/2014

Website: www.dci.jp

CExternal

RoHS Compliant
1550 nm Single-mode Transceiver, 32dB margin(120km)
Small Form Pluggable (SFP), with Diagnostic Monitoring
1.0625Gbd Fiber Channel/1.25 Gigabit Ethernet
Absolute Maximum Ratings
PARAMETERSYMBOLMIN

MAXUNITSNOTEStorage TemperatureTS4085

C

Supply Voltage

Vcc

0.5

4.0

V

Input Voltage

VIN

0.5

Vcc

V

Output Current

Io

---

50mA

Operating Current

IOP

---

400mA

SYMBOL

MIN

MAX

UNITS

NOTE

Case Operating Temperature

TC

0-40

7085

C

GD1550-SFP-LC120
GD1550-SFP-LC120(WT

Supply Voltage

Vcc

3.13.5V

Supply Current

ITX + IRX---300mA

Recommended Operating ConditionsPARAMETER

Page 2 of 8
Version 1.4
Date:07/07/2014

Website: www.dci.jp

RoHS Compliant
1550 nm Single-mode Transceiver, 32dB margin(120km)
Small Form Pluggable (SFP), with Diagnostic Monitoring
1.0625Gbd Fiber Channel/1.25 Gigabit Ethernet

Transmitter Electro-optical Characteristics
Vcc = 3.1 V to 3.5 V, TC = 0 C to 70 C (-40 C to 85 C)
PARAMETER
Output Optical Power
9/125 m fiber
Extinction Ratio
Center Wavelength
Spectral Width (-20dB)
Side Mode Suppression Ratio

SYMBOLMIN
0TYP.
---MAX+5UNITSdBm

SMSR

71530--30--1550-------15700.6---

dB
nm
nm
dB

Rise/Fall Time, (2080%)

T r, f

---

---

260

ps

Relative Intensity Noise

RIN------

120

dB/Hz

Total Jitter

TJ

---

---

227

ps

PoutER

COutput Eye

NOTE
AverageCompliant with IEEE802.3z

Max. Pout TX-DISABLE Asserted

POFF

---

---

45dBmDifferential Input Voltage

VDIFF

0.4---

2.0

V

Receiver Electro-optical Characteristics
Vcc = 3.1 V to 3.5 V, TC = 0 C to 70 C (-40 C to 85 C)
PARAMETER
Optical Input Power-maximum
Optical Input Power-minimum(Sensitivity)
Operating Center Wavelength
Optical Return Loss
Signal Detect-Asserted
Signal Detect-Deasserted
Differential Output Voltage
Data Output Rise, Fall Time
(2080%)Receiver Loss of Signal Output
Voltage Low
Receiver Loss of Signal Output
Voltage High

Page 3 of 8
Version 1.4
Date:07/07/2014

SYMBOLMIN

TYP.

MAXUNITS

NOTE

PIN

-8------34--32dBm
dBm

BER < 1012
BER < 1012ORLPA
PD
VDIFF
T r, f

1260
12--450.5----------------

1610--32--1.20.35

nmdBdBm
dBm
Vns

RX_LOSL

0---0.5

VRX_LOSH

2.4---VCC

VPIN

C

Website: www.dci.jp

RoHS Compliant
1550 nm Single-mode Transceiver, 32dB margin(120km)
Small Form Pluggable (SFP), with Diagnostic Monitoring
1.0625Gbd Fiber Channel/1.25 Gigabit Ethernet
Block Diagram of Transceiver

ELECTRICAL SUBASSEMBLY
DATA
DATA/

LD Driver&Fault Sense

LASER

TX_DISABLE
TX_FAULTOPTICALSUBASSEMBLIES

(0)
(1)

MOD_DEF

DUPLEX SC
RECEPTACLE

(2)

DATA
DATA/

POST-Amp&LOS Detect

RREAMPLIFIERICRX_LOS

Photo
DiodeTOP VIEW (Label side)

Transmitter Section
The transmitter section consists of a 1550 nm InGaAsP laser in an eye safe optical subassembly (OSA) which mates to the fibercable. The laser OSA is driven by a LD driver IC which converts differential input LVPECL logic signals into an analog laser
driving current.
TX_DISABLE
The TX_DISABLE signal is high (TTL logic “1”) to turn off the laser output. The laser will turn on when TX_DISABLE is low(TTL logic “0”).
Receiver Section
The receiver utilizes an APD photodiode mounted together with a trans-impedance preamplifier IC in an OSA. This OSA isconnected to a circuit providing post-amplification quantization, and optical signal detection.
Receive Loss (RX_LOS)The RX_LOS is high (logic “1”) when there is no incoming light from the companion transceiver. This signal is normally used by
the system for the diagnostic purpose. The signal is operated in LVTTL level.

Page 4 of 8
Version 1.4
Date:07/07/2014

Website: www.dci.jp

RoHS Compliant
1550 nm Single-mode Transceiver, 32dB margin(120km)
Small Form Pluggable (SFP), with Diagnostic Monitoring
1.0625Gbd Fiber Channel/1.25 Gigabit EthernetDimensions

DIMENSIONS ARE IN MILLIMETERSALL DIMENSIONS ARE 0.2mm UNLESS OTHERWISE SPECIFIED
Unit: mm

Page 5 of 8
Version 1.4
Date:07/07/2014

Website: www.dci.jp

RoHS Compliant
1550 nm Single-mode Transceiver, 32dB margin(120km)
Small Form Pluggable (SFP), with Diagnostic Monitoring
1.0625Gbd Fiber Channel/1.25 Gigabit Ethernet
SFP host board mechanical layout

XYS XYA
1

LX A S
1PIN1

LX A SLEGEND

AS BS

1. PADS AND VIAS ARE CHASSIS GROUND
2. THROUGH HOLES, PLATING OPTIONAL
3. HATCHED AREA DENOTES COMPONENTAND TRACE KEEPOUT(EXCEPT CHASSISGROUND)
4.AREA DENOTES COMPONENT KEEPOUT(TRACES ALLOWED)DIMENSIONS ARE IN MILLIMETERSPIN1A S BSAS BS

Unit: mm

Page 6 of 8
Version 1.4
Date:07/07/2014

Website: www.dci.jp

RoHS Compliant
1550 nm Single-mode Transceiver, 32dB margin(120km)
Small Form Pluggable (SFP), with Diagnostic Monitoring
1.0625Gbd Fiber Channel/1.25 Gigabit Ethernet
Assembly drawing

Page 7 of 8
Version 1.4
Date:07/07/2014

Website: www.dci.jp

RoHS Compliant
1550 nm Single-mode Transceiver, 32dB margin(120km)
Small Form Pluggable (SFP), with Diagnostic Monitoring
1.0625Gbd Fiber Channel/1.25 Gigabit Ethernet
Pin Assignment

Pin

PIN 11

PIN 20

PIN 10

PIN 1Signal Name

Description

1TGND

Transmit Ground2

TX_FAULTTransmit Fault

3

TX_DISABLE

Transmit Disable

4

MOD_DEF (2)SDA Serial Data Signal

5

MOD_DEF (1)SCL Serial Clock Signal

6

MOD_DEF (0)TTL Low

7

RATE SELECT

Open Circuit

89RX_LOS
RGND

Receiver Loss of Signal, TTL High, open collector
Receiver Ground

10

RGND

Receiver Ground

11

RGND

Receiver Ground

12RX

Receive Data Bar, Differential PECL, ac coupled

13RX
RGND

Receive Data, Differential PECL, ac coupled

1415

VCCR

Receiver Ground
Receiver Power Supply

16VCCTTransmitter Power Supply

17

TGND

Transmitter Ground

18TX

Transmit Data, Differential PCEL, ac coupled

19TX
TGND

Transmit Data Bar, Differential PCEL, ac coupled

20

Transmitter Ground

Eye Safety MarkThe GD1550-SFP-LC.S120 singlemode transceiver is aclass 1 laser product. It complies with EN 60825-1 andFDA 21 CFR 1040.10 and 1040.11. In order to meet laser
safety requirements the transceiver shall be operated
within theAbsolute Maximum Ratings.
CautionAll adjustments have been done at the factory before
the shipment of the devices. No maintenance and user
serviceable part is required. Tampering with andmodifying the performance of the device will result in
voided product warranty.
Note : All information contained in this document is subject to change without notice.
Page 8 of 8
Version 1.4
Date:07/07/2014

Website: www.dci.jp