Active Optical Connector
BF4M Series
Block diagram
Electrical input
VCSEL
Driver
Optical Fiber
PD
Electrical output
TIA +
LA
VCSEL
Nov.1.2018 Copyright 2018 HIROSE ELECTRIC CO., LTD. All Rights Reserved.
BF4 transmitter
VCSEL: Vertical Cavity Surface Emitting Laser
BF4 receiver
PD: Photo Diode
TIA: Trans mpedance Amplifier
LA: Limiting Amplifier
Fig.1
Overview
Hirose developed the micro "BF4MC connector" that
enables optical transmission of data between boards
that are incorporated in devices.
It converts an electrical signal that is received from a
board by using the semiconductor component built-in
the connector, and transfers the data via optical fiber.
BF4MC connector is a revolutionary design that enables
easy use of electromagnetic noise-free, insulated, long-
distance, high-speed transmission. These are the merits
of the optical transmission, mounted inside devices
achieving dramatic downsizing and lower power
consumption when compared to existing optical products.
It can be used in a wide range of applications, medic
alappliances Measurement equipments, FA system
etc.
Eye Diagram (Typical) :
Transmission speed 6.25 Gbps, Length 5 meters
Fig.2
Features
1. Optical transmissions achieved by
simplified electrical connections
Optical signal transmission is accomplished with electronic
connectors and has eliminated the need for cleaning the
mating faces of traditional fiber optic connectors.
2. High-speed, signal transmissions with
no EMI noise.
Optical signal transmissions rated up to 6.25 Gbps
are possible.
Since there is no EMI noise to contend with on the
signal lines, system design time is reduced.
Full-scale
5cm
3. Highly flexible optical fiber
Assemblies are made with a highly flexible, optical fiber that
allows for tight bend radiuses when used in small devices.
Fig.3
4. Long-distance, high-speed and high
quality signal transmissions
The BM4M design is capable of high speed and
high quality signal transmissions even over long
transmission distances.
6. S p a c e - s av i n g a n d l ow p ro f i l e
design with 1.5mm height
By using the BF4M, optical transmissions can be
achieved with small for m factor electronic
connectors that save on overall size and valuable
PCB space.
5. Low power consumption
Power consumption is significantly reduced compared
to conventional optical transceiver.
In cases where the application will demand a high level of reliability, such as automotive,
please contact a company representative for further information.
2016.2e
1
BF4M Series●Active Optical Connector
Electrical characteristics
Electrical characteristics of BF4MC-TX (transmitter side)
Mi
½
Transmission speed (8B/10B)
VDD voltage
ACTIVATE = H voltage
DIN common voltage
DIN differential voltage
0.05
2.25
1.0
150
200
Nominal
----------
2.5/3.3
----------
----------
----------
Max
6.25
3.6
VDD voltage
340
1400
Unit
Gbps
V
V
mVp
mVp
Electrical characteristics of BF4MC-RX (receiver side)
Mi
½
Transmission speed (8B/10B)
0.05
2.25
1.45
160
160
1.0
20.0
VDD voltage
VDD 15 voltage
DOUT common voltage
DOUT differential voltage
SD = H voltage
Imon
Nominal
----------
2.5/3.3
1.5
----------
----------
1.5
----------
Max
6.25
3.6
1.55
330
330
1.6
----------
Unit
Gbps
V
V
mVp
mVp
V
uA
Remarks
----------
----------
When driving with dual power sources
----------
----------
----------
For internal inspection
Nov.1.2018 Copyright 2018 HIROSE ELECTRIC CO., LTD. All Rights Reserved.
<Pin Assignment>
BF4MC-TX Plug
Fiber
<Pin Functions>
BF4MC-RX Plug
Fiber
Descriptions of BF4MC-TX pins
Synbol
VDD
GND
Name
Vsupply
Ground
Activate
Filter
Data input +
Data input –
Not Connect
Type
Ground
Input
Details
-------
H voltage:Active mode
L voltage:Sleep mode
Power Power Supply DC+2.5 or +3.3V
GND 1
20 GND
GND 1
20 GND
ACTIVE
FILT
DIN+
DIN–
NC
------- Decouping condenser connection contact
Input
Input
Differential Data Input
GND 2
GND 3
VDD 4
GND 5
FILT 6
GND 7
DIN+ 8
GND 9
GND 10
19 GND
18 GND
17 ACTIVE
16 NC
15 NC
14 GND
13 DIN-
12 GND
11 GND
GND 2
GND 3
Imon 4
SD 5
VDD 6
GND 7
DOUT- 8
GND 9
GND 10
19 GND
18 GND
17 EN
16 NC
15 VDD15
14 GND
13 DOUT+
12 GND
11 GND
------- Not connected in normal operation
Descriptions of BF4MC-RX pins
Synbol
VDD
VDD15
GND
SD
DOUT+
DOUT–
EN
Name
Vsupply
Vdd1.5V
Ground
Signal Detect
Data Output +
Data Output –
Regulator Enable
Mirrored photodiode
current monitor
Not Connect
Type
Details
Power Power for PD(*)
Power Power for Core(*)
Ground
Output
Output
Output
-------
H voltage:Detected
L voltage:Undetected
Differential Data Output
Top View
[Dual supply mode]
Not connected
Input
[Single supply mode]
EN pin must be connect to VDD
Output Not connected(Inspection pin)
------- Not connected in normal operation
Imon
NC
(*): For details, see Hirose's technical specification ETAD-K0671.
2
BF4M Series●Active Optical Connector
Product Materials
Plug harnesses
Port
Housing
Contact
Plate
VCSEL
VCSEL driver
Bonding wire
Sealing resin
Heat shrink tubing
Housing
Contact
Plate
PD
TIA/LA
Bonding wire
Sealing resin
Heat shrink tubing
Fiber
Coating
Details
LCP(BF4MC：White)
Phosphor bronze (Au plating)
Phosphor bronze (Ni plating)
GaAs
Si(CMOS)
Au
Epoxy resin
Polyolefin(Black)
LCP(BF4MC：White)
Phosphor bronze (Au plating)
Phosphor bronze (Ni plating)
GaAs
Si(CMOS)
Au
Epoxy resin
Polyolefin(Black)
Silica glass (GI50/80)
UV curable resin/Thermo plastic resin(
Ø
0.5)
Transmitter plug(TX)
Receiver plug(RX)
Nov.1.2018 Copyright 2018 HIROSE ELECTRIC CO., LTD. All Rights Reserved.
Optical fiber
Receptacles
Port
Transmitter Receptacle(TX)
and
Receiver Receptacle(RX)
Housing
Contact
Shell
Details
LCP(Black)
Phosphor bronze (Au plating)
Phosphor bronze (Au plating)
Composition of Product Number
Refer to the product number to determine the product specifications.
Plug harness
Receptacle
BF4M C-6G TX RX - B1 - 75MM
❶
❷
❸
❹
❺
❻
❶Series
❷Identification
of Bit rate
C-6G
: 0.05 to 6.25 Gbps
❸❹Type
of plug that attaches to both ends of the
harness
T
X : BF4 Transmitter plug
RX
: BF4 Receiver plug
❺Type
of fiber cable
B1
: diameter Ø0.5, Red
B2
: diameter Ø0.5, Blue
❻Identification
of the length of the fiber cable
*Cable length less than 1m
⇒
The end of the product
name·**MM(Millimeter)
*Cable length 1m or more
⇒
The end of the product
name·**M(Meter)
BF4 - TX - 14 DS - 0.5 V
(
01
)
❶
❶Series
❷Identification
of the Transmitter and Receiver
TX
: Transmitter
RX
: Receiver
❸Number
of Electrical terminal pin
14
pin
❹Identification
of Socket shape
Socket(S)
of Double line assignment pins(D)
❺Identification
of the electric terminal pitch
0.5mm
❻Identification
of the mating method
V：Vertical
mated to the mounting surface
❼Packing
specifications
None：500
pcs/reel
(01)：1000
pcs/reel
(02)：2000
pcs/reel
(10)：10
pcs/pack
(11)：100
pcs/reel
❷
❸
❹
❺
❻
❼
3
BF4M Series●Active Optical Connector
Nov.1.2018 Copyright 2018 HIROSE ELECTRIC CO., LTD. All Rights Reserved.
Connection example of +3.3 V (single power supply mode)
4
BF4M Series●Active Optical Connector
Product Appearance and HRS No.
Plug harness
L
（φ
0.5
）
3.1
Identification mark Identification mark
for TX side
for RX side
Nov.1.2018 Copyright 2018 HIROSE ELECTRIC CO., LTD. All Rights Reserved.
BF4MC harness
Part No.
BF4MC-6GTXRX-B1-45MM
BF4MC-6GTXRX-B1-50MM
BF4MC-6GTXRX-B1-55MM
BF4MC-6GTXRX-B1-60MM
BF4MC-6GTXRX-B1-65MM
BF4MC-6GTXRX-B1-70MM
BF4MC-6GTXRX-B1-75MM
BF4MC-6GTXRX-B1-80MM
BF4MC-6GTXRX-B1-85MM
BF4MC-6GTXRX-B1-90MM
BF4MC-6GTXRX-B1-95MM
BF4MC-6GTXRX-B1-100MM
BF4MC-6GTXRX-B1-1M
BF4MC-6GTXRX-B1-2M
BF4MC-6GTXRX-B1-3M
BF4MC-6GTXRX-B1-4M
BF4MC-6GTXRX-B1-5M
HRS No.
831-1102-0 04
831-1102-0 05
831-1102-0 06
831-1102-0 07
831-1102-0 08
831-1102-0 09
831-1102-0 00
831-1102-0 11
831-1102-0 12
831-1102-0 13
831-1102-0 14
831-1102-0 15
831-1109-9 00
831-1109-9 01
831-1109-9 02
831-1109-9 03
831-1109-9 04
Fiber
Cable length L
45 mm
50 mm
55 mm
60 mm
65 mm
70 mm
75 mm
80 mm
85 mm
90 mm
95 mm
100 mm
1m
2m
3m
4m
5m
1.45
Ø0.5 Red
Length (L) of the harness
· The shortest harness length is 45mm, and the harness up to 100mm in length is available in 5mm increments.
(45mm, 50mm, 55mm …, 100mm)
· Harness longer than those listed above is also available upon request. Please inform us of your desired harness length.
· Blue Fiber color is also available. Contact your sales representative for details.
1.45
1.3
1.3
3.1
9.82
（
6
）
（
6
）
9.82
5
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