AK2571 参数 Datasheet PDF下载

AKM Confidential

AK2571

= Preliminary =

for WDM Laser Diodes

AK2571

Single-Chip Automatic Power/Temperature Control

Features

Single Chip LSI that integrates APC (Auto Power Control) and ATC (Auto Temperature Control) functions for

WDM Laser Module

A controlling TEC (Thermal Electrical Cooler) stabilizes the temperature of LD module in the range of +/-0.1°C

by PID algorithm.

Parameters controlling Laser Diode are user programmable and stored in EEPROM

Internal Temperature Sensor detects on-chip temperature, enabling compensation internal and external

components that may be affected by changing ambient temperature.

Autonomous operation (internal oscillator and logic).

Pin-selectable wavelength data for tunable laser diodes (four options).

Single 3.3V operation

64-pin LQFP or Bare chip

Description

The AK2571 is a single-chip solution for WDM Laser Diode Module applications. It integrates both ATC (Auto

Temperature Control) and APC (Auto Power Control) functions in a small 64-pin LQFP or bare die package..

The ATC function of the AK2571 detects the LD module temperature via an external thermister and uses the PID

algorithm to control the Thermo-Electric Cooler (TEC). This provides +/- 0.1°C stabilization.. A customer can program the

appropriate PID parameters into the internal EEPROM , thereby providing compensation characteristics for each Laser

Diode. TEC control is handled through either PWM or Analog current control through I-DAC4. These are easily selected

by an EEPROM (Register) setting.

The APC has two functions. The first function is to compensate for Laser Diode power decreases caused by aging. The

other function is to compensate for temperature variations of AK2571 and external components (current amplifier or

driver circuits) which may be affected by ambient temperature within the LDM. The AK2571 does this by controlling

BIAS and modulation current according to the look up table in EEPROM .

The AK2571 has every alarm needed for WDM modules (Loss of power, Over current, Temperature etc.). There is a

dithering function for modulation current that improves the extinction ratio for long distance transmissions.

Also, parameter and compensation data can be stored for four wavelengths. If a customer uses a tunable laser diode, it is

very easy to change the wavelength by pin control.

<Rev. 0.6E Preliminary>

-1-

2001/11