Active Optical Connector
BF4M Series
Electrical input Optical data transmission Electrical output
TIA +
VCSEL
PD
VCSEL
LA
Driver
Optical Fiber
BF4 transmitter BF4 receiver
PD : Photo Diode
VCSEL : Vertical Cavity Surface Emitting Laser
TIA : Trans mpedance Amplifier
LA : Limiting Amplifier
Fig.1
Overview
Eye Diagram (Typical) :
Hirose developed the microBF4MC connecto that
Transmission speed 6.25 Gbps, Length 5 meters
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.
Fig.2
Features
1. Optical transmissions achieved by
simplified electrical connections
An easy 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 on the signal lines,
Full-scale
system design time will be saved.
3. Highly flexible optical fiber
5cm
A highly flexible optical fiber is useful for narrow
space wiring in the box.
Fig.3
4. Long-distance, high-speed and high
6. Space-sa ving and low profile
quality signal transmissions
design with 1.5mm height
The BM4M design is capable of high speed and
By using the BF4M, optical transmissions can be
high quality signal transmissions even over long
achieved with small form factor electronic
transmission distances.
connectors that save on overall size and valuable
5. Lo w power consumption
PCB space.
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,
1
2018.12
please contact a company representative for further information.
Dec.1.2018 Copyright 2018 HIROSE ELECTRIC CO., LTD. All Rights Reserved.BF4M SeriesActive Optical Connector
BF4 variations
TYPE Used image Product image
BF4M-RX
Both ends BF4M
(Connection for board to board)
BF4M-TX
BF4M
One end BF4M, the other conventional
outside the device
optical connector
(Connection for box interface)
Inside the device
Electrical characteristics
Electrical characteristics of BF4MC-TX (transmitter side)
Mi Nominal Max Unit
Transmission speed (8B/10B) 0.05 ---------- 6.25 Gbps
VDD voltage 2.25 2.5/3.3 3.6 V
ACTIVATE = H voltage 1.0 ---------- VDD voltage V
DIN common voltage 150 ---------- 340 mVp
DIN differential voltage 200 ---------- 1400 mVp
Electrical characteristics of BF4MC-RX (receiver side)
Mi Nominal Max Unit Remarks
Transmission speed (8B/10B) 0.05 ---------- 6.25 Gbps ----------
VDD voltage 2.25 2.5/3.3 3.6 V ----------
VDD 15 voltage 1.45 1.5 1.55 V When driving with dual power sources
DOUT common voltage 160 ---------- 330 mVp ----------
DOUT differential voltage 160 ---------- 330 mVp ----------
SD = H voltage 1.0 1.5 1.6 V ----------
Imon 20.0 ---------- ---------- uA For internal inspection
<Pin Assignment> <Pin Functions>
BF4MC-TX Plug BF4MC-RX Plug Descriptions of BF4MC-TX pins
Synbol Name Type Details
VDD Vsupply Power Power Supply DC+2.5 or +3.3V
Fiber Fiber
Ground Ground -------
GND
H voltage : Active mode
GND 1 20 GND GND 1 20 GND
Activate Input
ACTIVE
L voltage : Sleep mode
Filter ------- Decouping capacitor connection contact
FILT
GND 2 GND 2 19 GND
19 GND
DIN+ Data input + Input
Differential Data Input
DIN Data input Input
GND 3
18 GND GND 3 18 GND
VDD 4 17 ACTIVE Imon 4 17 EN
Not Connect ------- Not connected in normal operation
NC
16 NC
GND 5 16 NC SD 5
FILT 6 15 NC VDD 6 15 VDD15
GND 7 14 GND 14 GND
GND 7
13 DIN-
DIN+ 8 DOUT- 8 13 DOUT+ Descriptions of BF4MC-RX pins
GND 9 12 GND GND 9 12 GND
Synbol Name Type Details
GND 10 11 GND GND 10 11 GND
VDD Vsupply Power Power for PD(*)
VDD15 Vdd1.5V Power Power for Core(*)
GND Ground Ground -------
Top View
H voltage:Detected
SD Signal Detect Output
L voltage:Undetected
DOUT+ Data Output + Output
Differential Data Output
DOUT Data Output Output
[Dual supply mode]
Not connected
EN Regulator Enable Input
[Single supply mode]
EN pin must be connect to VDD
Mirrored photodiode
Imon Output Not connected(Inspection pin)
current monitor
NC Not Connect ------- Not connected in normal operation
(*): For details, see Hirose's technical speci cation ETAD-K0671.
2
Dec.1.2018 Copyright 2018 HIROSE ELECTRIC CO., LTD. All Rights Reserved.