ACS411CS datasheet(24/43 Pages) SEMTECH

24 / 43 page

ACS411CS PRE-RELEASE Issue 6.0 July 1999.

Twin Fiber LASER link (1310nm Laser and PIN)

Link Budget Example (Rtset set so LASER launch current = 25 mA peak)

Fiber type Glass (single mode)

Fiber size 9 micron

Minimum transmit couple power to fiber (µW)

1000

Minimum PIN responsivity (A/W)

0.8

Minimum ACS9020 sensitivity (nA)

1500

Minimum input power to ACS9020 amplifier (µW)

Link budget (dB) (single mode fiber attenuation = 0.3 dB/km)

Twin Fiber LED link (880nm LED + PIN)

Link Budget Example (Rtset set so LED launch current = 100 mA peak)

Fiber type Glass (multimode)

Fiber size 62.5micron

Minimum transmit couple power to fiber (µW)

100

Minimum PIN responsivity (A/W)

0.1

Minimum ACS9020 sensitivity (nA)

1500

Minimum input power to ACS9020 amplifier (µW)

Link budget (dB) (multi mode fiber attenuation = 3 dB/km)

8.24

Link Budgets

The link budget is the difference between the power

coupled to the fiber via the transmit Laser/LED and

the power required to realise the minimum input-

amplifier current via the receive PIN/LED. The link

budget is normally specified in dB, and represents

the maximum attenuation allowed between

communicating Lasers/LEDs. The budget is utilised

in terms of the cable length, cable connectors and

splices. It usually includes an operating margin to

allow for degradation in LASER/LED performance.

The power coupled to the cable is a function of the

efficiency of the Laser/LED, the current applied to

the Laser/LED and the type of the fiber optic cable

employed.

Single Fiber LASER link (1310nm and 1510nm WDM device)

Link Budget Example (Rtset set so LASER launch current = 25 mA peak)

Fiber type Glass (single mode)

Fiber size 9 micron

Minimum transmit couple power to fiber (µW)

1000

Minimum PIN responsivity (A/W)

0.8

Minimum ACS9020 sensitivity (nA)

1500

Minimum input power to ACS9020 amplifier (µW)

Link budget (dB) (single mode fiber attenuation = 0.3 dB/km)

Figure 14: Link bugdet examples.

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