Optical Bit Rate Multiplier
Description
The Optical Bit Rate Multiplier (OBRM) is a device which increases the repetition rate of an input optical signal by 2 times. By cascading 2, 3 or 4 OBRM, the repetition rate will increase by 4, 8 or 16 times.
Block diagram
The ORBM is an interferometer with a delay of (2n+1) T/2 between two free-space optical paths.
We add a variable optical attenuation (VOA) in order to equilibrate the insertion losses in each path. A variable optical delay (VODL) can also be added:
Absolute maximum ratings
Parameter
Symbol
Min
Typ.
Max
Unit
Remarks/Conditions
Maximal optical input power
OpIn
500
mW
Storage temperature range
STR
-10
40
°C
Humidity
RH
5
85
%
Non condensing
Operating conditions
Parameter
Symbol
Min
Typ.
Max
Unit
Remarks/Conditions
Operating wavelength
OWR
1520
1625
nm
Operating temperature range
OTR
10
35
°C
Specifications
Parameter
Symbol
Min
Typ.
Max
Unit
Remarks/Conditions
Insertion Losses1
OBRM x2
IL
5.0
dB
OBRM x4
9.0
dB
IL uniformity between both arms1
ΔIL
0.1
0.5
dB
Variable Optical Attenuation accuracy2
0.1
dB
Optical Delay
0
400
ps
Optical delay accuracy
0.1
ps
Variable Optical Delay range3
OBRM x2
150
ps
OBRM x4 stage #1
300
OBRM x4 stage #2
150
IL variation over delay range3
0.5
dB
Phase tuning range4
1.5
FSR
for
Phase tuning time constant4
1
s
Phase tuning voltage4
4
V
Optical Return Loss
ORL
35
dB
Packaging size
standard
130 x 65 x 19.5
mm3
VODL option5
216 x 92 x 40
Fiber Type
PANDA PM
1 measured over OTR and OWR
2 for VOA option
3 for VODL option
4 for phase tuning option
5 excluding micrometer head or piloted actuator
Additional input or output
We can add a second input or/and a second output to our OBRM products.
The second output can be used for the monitoring of the insertion losses equilibrate in each path.
Cascaded OBRM
By connecting output of a first OBRM (delay (2n+1) T/2) to the input of a second OBRM (delay (2n+1) T/4), we increase the initial repetition rate by 4.
By cascading 3 or 4 OBRM, the repetition rate will increase by 8 or 16 times.
In order to avoid having two separate products connected via a PM jumper, we propose full free-space x4 OBRM, available with or without VODL option. In this configuration, the IL between the input and the output #2 will be less than 9 dB.
The variable optical delay range will be 300ps for OBRM #1 and 150ps for the OBRM #2.
We propose this product with two outputs:
- OBRM #1 output to collect the x2 repetition rate. This output will help the user to equilibrate the both paths insertion losses of the OBRM #1
- OBRM #2 output to collect the x4 repetition rate.
In case of VODL option, the delay control is the same for both OBRM in order to propose an easy-use product (a delay shift of 1ps for the OBRM #1 corresponds to a delay shift of 0.5ps for the OBRM #2).
Phase tuning option
We also add two phase tuning control on both interferometers. We control the phase by slightly changing the delay of the interferometer via a thermal heater fixed on an optical window placed on the optical path.
Fiber type and connectors
The OBRM is made using PM PANDA fiber.
The devices can be proposed with any kind of connectors (FP/UPC, FC/APC, SC/PC, SC/APC, LC/PC, E2000/PC, E2000/APC).
Wavelength range
The OBRM can be proposed at different wavelength range, from the visible to the IR. The device will be operational on a wavelength range of a tens of nanometers centered on the wavelength required by customer.
Custom product
Thanks to our free-space technology we can easily customize most of our product and so it is for the OBRM. Customer can feel free to ask for any customization they need. We will examine the request and do our best to have a positive answer.
Package layout
描述 [描述] 光学比特率倍增器(OBRM)是一种将输入光信号的重复率提高2倍的设备。通过级联2、3或4个OBRM,重复率将增加4、8或16倍。