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TZA3047B

30 Mbits/s up to 1.25 Gbits/s laser drivers

Philips Electronics 

Philips Semiconductors

30 Mbits/s up to 1.25 Gbits/s laser drivers

Product specification

TZA3047A; TZA3047B

handbook, full pagewidth

Iav(MON) ER

(µA)

1500 15

ER = 20 − IER

2 µA

5

30

0 10 15 30

Iav(MON) = 1580 − 5.26 × IAVR µA

IAVR (µA)

IER (µA)

295

MGT892

Fig.5 Average monitor current and extinction ratio as a function of IAVR and IER.

12.1.3 DUAL-LOOP CONTROL

The dual-loop control measures the monitor current (IMON)

corresponding with an optical ‘one’ level and the IMON

corresponding with the optical ‘zero’ level. The measured

IMON(one) and IMON(zero) are compared with the average

monitor current setting and the extinction ratio setting

according to:

Iav(MON) = I--M----O----N---(-o---n--e---)---+-2----I--M----O---N---(--z--e---r-o---)

ER = I-I-M-M---O-O---NN---(-(z-o--e-n-r-e-o--))

The dual-loop controls the bias and the modulation current

for obtaining the IMON(one) and IMON(zero) current levels

which correspond with the programmed AVR and ER

settings.

Performance of the dual-loop for high data-rate is linked to

the quality of the incoming IMON signal: a high

performance interconnection between monitor photodiode

and MON input is requested for maximum data rate

applications (1.25 Gbits/s).

The operational area of the dual-loop and the control area

of the monitor input current must respect the following

equations:

50 µA < IMON(zero) < 500 µA

250 µA < IMON(one) < 2500 µA

Stability of ER and AVR settings are guaranteed over a

range of temperature and supply voltage variations.

2003 Jun 05

16

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