<s>
In	O
telecommunications	O
,	O
launch	B-Device
numerical	I-Device
aperture	I-Device
(	O
LNA	O
)	O
is	O
the	O
numerical	O
aperture	O
of	O
an	O
optical	O
system	O
used	O
to	O
couple	O
(	O
launch	O
)	O
power	O
into	O
an	O
optical	B-Architecture
fiber	I-Architecture
.	O
</s>
<s>
LNA	O
is	O
one	O
of	O
the	O
parameters	O
that	O
determine	O
the	O
initial	O
distribution	O
of	O
power	O
among	O
the	O
modes	O
of	O
an	O
optical	B-Architecture
fiber	I-Architecture
.	O
</s>
