AGERE A1750A62RRSC10, A1750A62RRSC08, A1750A62RRSC06, A1750A62RRFC10, A1750A62RRFC08 Datasheet

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AGERE A1750A62RRSC10, A1750A62RRSC08, A1750A62RRSC06, A1750A62RRFC10, A1750A62RRFC08 Datasheet

Data Sheet, Rev. 4

June 2001

A1750A DWDM Analog

Forward-Path or Return-Path Laser Module

Features

Low adiabatic chirp

Excellent linearity

Standard ITU wavelengths

Advanced analog chip design

Tested for forward-path or return-path applications

Reduces equipment requirements in the hub

Exceeds Telcordia Technologies* 468 specification.

Description

The A1750A laser module is a dense wavelengthdivision multiplexing laser with a DFB chip designed specifically for analog RF applications. The device features low adiabatic chirp to maximize signal quality in short and long lengths of fiber. The laser’s excellent inherent linearity minimizes degradation of the broadcast signals caused by the QAM channels.

Wavelength-division multiplexing (WDM) has gained widespread acceptance in the telecommunications market and is being designed into emerging cable television network architectures. Dense WDM, a method for delivering targeted QAM signals to different locations, allows multiple signal sets to be combined onto a single strand of fiber for transmission from a headend to a hub. At the hub, individual QAM signals can be selected and combined with broadcast analog channels. The A1750A DWDM laser module reduces cable network architecture fiber requirements and lessen equipment requirements in the hub.

The A1750A is available at a variety of standard ITU wavelengths. The lasers are offered as either for- ward-path (40 MHz–860 MHz) or return-path modules (5 MHz–210 MHz).

Applications

Networks with limited fiber

Architectures using separate optical wavelengths to carry targeted services

*Telcordia Technologies is a trademark of Telcordia Technologies Inc.

A1750A DWDM Analog

Data Sheet, Rev. 4

Forward-Path or Return-Path Laser Module

June 2001

 

 

Absolute Maximum Ratings

Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess of those given in the operational sections of the data sheet. Exposure to absolute maximum ratings for extended periods can adversely affect device reliability.

Parameter*

Symbol

Min

Max

Unit

 

 

 

 

 

Operating Case Temperature Range

TC

–25

65

°C

 

 

 

 

 

Storage Temperature Range

Tstg

–40

70

°C

 

 

 

 

 

Monitor Photodiode Reverse Voltage

VMPD

10

V

 

 

 

 

 

Laser Forward Current

IF

150

mA

 

 

 

 

 

Reverse Voltage (Laser)

VR

2

V

 

 

 

 

 

TEC Current

ITEC

–1.5

1.5

A

 

 

 

 

 

RF Input Power

PRFIN

62

dBm V

 

 

 

 

 

* The device can withstand continuous exposure to the specified limits without damage.

Characteristics

Table 1. Key Characteristics

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

 

 

 

 

 

 

 

Frequency Range:1

F

 

 

 

 

Return Path

 

 

5

210

MHz

Forward Path

 

 

40

860

MHz

 

 

 

 

 

 

 

Frequency Response:1

|S21|

IF = 60 mA,

 

 

 

 

5 MHz—210 MHz

 

TOP = 25 °C,

±0.5

dB

40 MHz—860 MHz

 

 

±0.5

dB

 

 

 

 

 

 

 

RF Return Loss:1

|S21|

IF = 60 mA,

 

 

 

5 MHz—210 MHz

 

 

 

>16

dB

40 MHz—860 MHz

 

 

 

>16

dB

 

 

 

 

 

 

 

Optical Output Power

PO

IF = IOP

6, 8, or

mW

 

 

 

10

 

 

 

 

 

 

 

 

 

 

Laser Relative Intensity

RIN

IF = ITH + 70 mA,

< –155

dB/Hz

Noise

 

T = 25 °C

 

 

 

 

 

 

 

 

 

 

 

Composite Second Order 2, 3

CSO

IF = IOP, OMI = 10%

< –50

dBc

Composite Triple Beat 2, 4

CTB

IF = IOP, OMI = 10%

< –60

dBc

Available Wavelengths5

λ

IP = IOP, T = TOP

1528

1563

nm

Wavelength Drift6

ΔλOP

IF = 60 mA,

0.04

nm

 

 

T = TOP,

 

 

 

 

 

 

TC varied from min—>max

 

 

 

 

 

 

 

 

 

 

 

Adiabatic Chirp

FM

IF = 60 mA,

40

100

MHz/mA

 

 

TOP = 25 °C,

 

 

 

 

 

 

measured at 500 MHz

 

 

 

 

 

 

 

 

 

 

 

Operating Case Tempera-

TC

IF = IOP

–20

65

°C

ture Range

 

 

 

 

 

 

 

 

 

 

 

 

 

1.Tested in a 50 Ω system with 27 Ω series matching resistor.

2.Eight-channel loading, 10% OMI, 40 km fiber.

3.Measured at 42 MHz.

4.Measured at 553.25 MHz, 577.25 MHz. and 595.25 MHz.

5.Consult an Agere Systems account manager for other wavelengths.

6.Change in wavelength as case temperature is changed.

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Agere Systems Inc.

Data Sheet, Rev. 4

A1750A DWDM Analog

June 2001

Forward-Path or Return-Path Laser Module

 

 

Characteristics (continued)

Table 2. Additional Characteristics

Parameter

Symbol

Conditions

Min

Max

Unit

 

 

 

 

 

 

Bias Current1 (Operating Current)

IB

BOL

120

mA

Threshold Current

ITH

25 °C, BOL

30

mA

 

 

 

 

 

 

Slope Efficiency2

η

IP = ITH + 20 and

0.10

mW/mA

 

 

ITH + 60

 

 

 

 

 

 

 

 

 

Monitor Photocurrent

IMON

IOP = 0 mA, VRM = 5 V,

10

200

μA/mW

 

 

TOP = 25 °C

 

 

 

 

 

 

 

 

 

Operating Chip Temperature3

TOP

IF = IOP

15

35

°C

TEC Current

ITEC

–20 °C < TC < 65 °C,

–1.5

1.5

A

 

 

TOP = 15 °C—35 °C,

 

 

 

 

 

IF = 60 mA

 

 

 

 

 

 

 

 

 

TEC Voltage

VTEC

TOP = 15 °C—35 °C over T C

–2

2

V

 

 

 

 

 

 

Thermistor Resistance

RTH

TOP = 25 °C

9.5

10.5

k Ω

 

 

 

 

 

 

Optical Return Loss

ORL

TC

40

dB

 

 

 

 

 

 

Side Mode Suppression Ratio

SMSR

IF = IOP

30

dB

 

 

 

 

 

 

1.Bias point at which all specifications apply.

2.For 10 mW output power. Minimum slope efficiency is lower for lower power lasers.

3.Chip temperature at which wavelength specification is met. Operating chip temperature is reported for each laser.

Electrical Schematics

 

1

 

NC

14

 

 

 

 

 

 

 

 

 

ISOLATOR

 

 

 

2

 

 

13

(+)

 

3

 

 

12

(–)

(–)

4

 

 

11

(+)

(+)

5

 

NC

10

 

 

 

 

 

 

(+)

6

 

CASE

9

 

 

 

 

 

 

 

 

 

GROUND

 

 

(–)

7

TEC

CASE

8

 

 

 

 

 

 

 

GROUND

 

 

 

 

 

 

 

 

 

 

 

 

1-1233F

Figure 1. A1750A Laser Schematic

Agere Systems Inc.

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