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參數資料
| 型號： | TZA3041BHL |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 其它接口 |
| 英文描述： | Gigabit Ethernet/Fibre Channel laser drivers |
| 中文描述： | SPECIALTY INTERFACE CIRCUIT, PQFP32 |
| 封裝： | 5 X 5 X 1.40 MM, PLASTIC, LQFP-32 |
| 文件頁數： | 8/32頁 |
| 文件大小： | 153K |
| 代理商： | TZA3041BHL |
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2002 Aug 13
8
Philips Semiconductors
Product specification
Gigabit Ethernet/Fibre Channel laser
drivers
TZA3041AHL; TZA3041BHL;
TZA3041U
The reference current and the resistor for the optical 1
modulation current control loop is calculated using the
following formulae:
(1)
(2)
The reference current and resistor for the optical 0 bias
current control loop is calculated using the following
formulae:
1
4
(3)
(4)
In these formulae, I
MPD(ONE)
and I
MPD(ZERO)
represent the
MPD current during an optical 1 and an optical 0 period,
respectively.
E
XAMPLE
A laser operates at optical output power levels of 0.3 mW
forlaserHIGHand0.03 mWforlaserLOW(extinctionratio
of 10 dB). Suppose the corresponding MPD currents for
this particular laser are 260 and 30
μ
A, respectively.
In this example, the reference current flowing into
pin ONE is:
This current can be set using a current source or simply by
a resistor of the appropriate value connected between
pin ONE and V
CC(R)
.
In this example, the resistor is:
16.25
In this example, the reference current at pin ZERO is:
1
4
and can be set using a resistor:
7.5
×
It should be noted that the MPD current is stabilized rather
than the actual laser optical output power. Any deviations
between optical output power and MPD current, known as
‘tracking errors’, cannot be corrected.
Designing the modulation and bias current control
loop
The optical 1 and 0 current control loop time constants are
determined by on-chip capacitances. If the resulting time
constants are found to be too small in a specific
application, they can be increased by connecting a
capacitor between pins TZERO and TONE.
The optical 1 modulation current control loop time
constant (
τ
) and bandwidth (B) can be estimated using the
following formulae:
(5)
(6)
The optical 0 bias current control loop time constant and
bandwidth can be estimated using the following formulae:
(7)
(8)
The term
η
LASER
(dimensionless) in the above formulae is
the product of the following two terms:
η
EO
is the electro-optical efficiency which accounts for
the steepness of the laser slope characteristic. It defines
the rate at which the optical output power increases with
modulation current, and is measured in W/A.
R is the MPD responsivity. It determines the amount of
MPD current for a given value of optical output power,
and is measured in A/W.
E
XAMPLE
A laser with an MPD has the following specifications:
P
O
= 1 mW, I
th
= 25 mA,
η
EO
= 30 mW/A, R = 500 mA/W.
The term I
th
is the required threshold current to switch on
the laser. If the laser operates just above the threshold
level, it may be assumed that
η
EO
near the optical 0 level
is 50% of
η
EO
near the optical 1 level, due to the slope
decreasing near the threshold level.
I
ref ONE
)
16
1
I
MPD(ONE)
×
=
A
[ ]
R
ONE
ONE
I
MPD(ONE)
I
=
=
[
]
I
ref ZERO
)
I
MPD(ZERO)
×
=
A
[ ]
R
ZERO
I
ZERO
---1.5
I
MPD(ZERO)
------------6
=
=
[
]
I
ref ONE
)
16
260
10
×
6
–
×
16.25
μ
A
=
=
R
ONE
10
6
–
×
-----------1.5
92.3 k
=
=
I
ref ZERO
)
30
10
6
–
×
×
7.5
μ
A
=
=
R
ZERO
10
6
–
--------1.5
200 k
=
=
τ
ONE
40
10
12
–
C
TONE
+
×
(
)
LASER
10
3
×
80
×
=
s
[ ]
B
ONE
π
τ
ONE
×
2
=
Hz
[
]
B
ONE
η
+
2
π
40
10
–
×
C
TONE
(
)
×
80
×
10
3
×
-------------------------------------------------------------------------------------------------
Hz
[
]
=
τ
ZERO
40
10
12
–
C
TZERO
+
×
(
)
LASER
10
3
×
50
×
=
s
[ ]
B
ZERO
τ
ZERO
2
π
×
-------------1
=
Hz
[
]
B
ZERO
η
+
2
π
40
10
–
C
TZERO
×
(
)
×
50
×
10
3
×
----------------------------------------------------------------------------------------------------
Hz
[
]
=
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