Optical Bit Rate Multiplierw w w . k y l i a . c o m
i n f o @ k y l i a . c o m

OBRM

1 – Description
The Optical Bit Rate Multiplier (OBRM) is a device which increases the repetition rate of an input opticalsignal by 2 times. By cascading 2, 3 or 4 OBRM, the repetition rate will increase by 4, 8 or 16 times.

2 – Block diagram
The ORBM is an interferometer with a delay of (2n+1) T/2 between two free-space optical paths.
Delay = (2n+1) T/2
micrometer headfor IL attenuation

optical input(PM fiber)

optical output(PM fiber)

input signal:
symbol spacing T

output signal:
symbol spacing T /2

OBRM

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:
micrometer headfor tunable delay

optical input(PM fiber)

optical output(PM fiber)

OBRM with VODL
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OBRM

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OBRM : Optical Bit Rate Multiplier

3 – Absolute maximum ratings
Parameter
Maximal optical input power
Storage temperature rangeHumidity

Symbol
OpIn
STR
RH

Min

Symbol
OWR
OTR

Min
1520
10Symbol

Min

Typ.

Max
500
4085

UnitmW
°C
%

Typ.

Max
1625
35

Unit
nm°C

Remarks/Conditions

Typ.

Max
5.0
9.0
0.5
0.1
4000.1

Unit
dB
dB
dB
dB
ps
ps

Remarks/Conditions-105Remarks/Conditions

Non condensing

4 – Operating conditions
Parameter
Operating wavelength
Operating temperature range

5 – Specifications
Parameter
1
Insertion Losses

OBRM x2
OBRM x4
1IL uniformity between both arms
2
Variable Optical Attenuation accuracy
Optical Delay
Optical delay accuracy
OBRM x2Variable Optical
OBRM x4 stage #1
3
Delay range
OBRM x4 stage #2
3IL variation over delay range
4Phase tuning range
4Phase tuning time constant4
Phase tuning voltage
Optical Return LossstandardPackaging size
5
VODL option
Fiber TypeILΔIL

0.1
0150
300
150

ps
0.5

1.5
1
4
ORL

35
130 x 65 x 19.5
216 x 92 x 40
PANDA PMdB
FSRsVdBmm

for

3

1

measured over OTR and OWR
for VOA option
3for VODL option
4
for phase tuning option
5
excluding micrometer head or piloted actuator
2

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OBRM : Optical Bit Rate Multiplier

6 – 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.

input #1

output #1

input #2

output #2

OBRM with additional input and output

7 – 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.

Delay = (2n+1) T/2

Delay = (2n+1) T/4

PM jumper

Cascaded OBRM in order to increase the repetition rate of the signal 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.
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OBRM

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OBRM : Optical Bit Rate Multiplier

micrometer headfor tunable delay

micrometer headfor IL attenuation
OBRM #1

micrometer headfor IL attenuation
OBRM #2

input signal:
symbol spacing T

output signal #2:
symbol spacing T/4
output signal #1:
symbol spacing T/2

OBRM x4 with VODL and VOA options

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OBRM4

OBRM : Optical Bit Rate Multiplier

OBRM with VODL option packaging

We propose this product with two outputs:- OBRM #1 output to collect the x2 repetition rate. This output will help the user to equilibrate theboth 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).

8 – 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.

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OBRM5OBRM : Optical Bit Rate Multiplier

micrometer headfor tunable delay

Thermal heater
control for stage #1

Thermal heater
control for stage #2

translation stage
for delay
adjustment

micrometer headfor IL attenuation
OBRM #1

micrometer headfor IL attenuation
OBRM #2

input signal:
symbol spacing T

output signal #2:
symbol spacing T/4
output signal #1:
symbol spacing T/2

OBRM x4 with VODL, VOA and phase tuning options

9 – 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).

10 – 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 bycustomer.

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OBRM

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OBRM : Optical Bit Rate Multiplier

11 – Custom productThanks 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.

12 – Package layout

OBRM x4 packaging

OBRM x4 with VODL option packaging

13 – Revision
dateApril 26, 2013
ndJune 2 , 2014

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version
OBRM V1.0
OBRM V1.1

ObjectCreation
Added phase tuning option

OBRM7