<s>
A	O
distributed	B-Device
Bragg	I-Device
reflector	I-Device
(	O
DBR	O
)	O
is	O
a	O
reflector	O
used	O
in	O
waveguides	O
,	O
such	O
as	O
optical	B-Architecture
fibers	I-Architecture
.	O
</s>
<s>
Increasing	O
the	O
number	O
of	O
pairs	O
in	O
a	O
DBR	O
increases	O
the	O
mirror	O
reflectivity	O
and	O
increasing	O
the	O
refractive	O
index	O
contrast	O
between	O
the	O
materials	O
in	O
the	O
Bragg	O
pairs	O
increases	O
both	O
the	O
reflectivity	O
and	O
the	O
bandwidth	B-Algorithm
.	O
</s>
<s>
Substituting	O
into	O
the	O
formula	O
above	O
gives	O
a	O
bandwidth	B-Algorithm
of	O
about	O
200nm	O
for	O
630nm	O
light	O
.	O
</s>
<s>
Distributed	B-Device
Bragg	I-Device
reflectors	I-Device
are	O
critical	O
components	O
in	O
vertical	O
cavity	O
surface	O
emitting	O
lasers	O
and	O
other	O
types	O
of	O
narrow-linewidth	O
laser	O
diodes	O
such	O
as	O
distributed	O
feedback	O
(	O
DFB	O
)	O
lasers	O
and	O
distributed	B-Device
bragg	I-Device
reflector	I-Device
(	O
DBR	O
)	O
lasers	O
.	O
</s>
<s>
They	O
are	O
also	O
used	O
to	O
form	O
the	O
cavity	O
resonator	O
(	O
or	O
optical	O
cavity	O
)	O
in	O
fiber	B-Device
lasers	I-Device
and	O
free	O
electron	O
lasers	O
.	O
</s>
<s>
Bio-inspired	O
Bragg	B-Device
Reflectors	I-Device
are	O
1D	O
photonic	O
crystals	O
inspired	O
by	O
nature	O
.	O
</s>
