Description

The cooled BOSA (Bi-directional Optical Sub-Assembly) module integrates both transmitter and receiver functions into a compact optical package, providing a complete solution for high-performance optical communication systems.

Featuring a DFB laser transmitter and high-linearity PIN receiver, this module ensures stable optical output and accurate signal detection. With integrated TEC, thermistor, optical isolator, and WDM filter, it delivers excellent wavelength stability, low noise performance, and high reliability.

Designed for demanding applications such as CATV and RFOG systems, the BOSA module offers a compact and efficient solution for OEM optical integration.

Key Features

• Integrated transmitter and receiver (Tx/Rx)
• High power optical output
• High linearity PIN receiver
• Built-in TEC and thermistor
• Integrated optical isolator and WDM filter
• Stable single longitudinal mode emission
• Compact BOSA package
• Telcordia GR-468 compliant

Applications

• CATV systems
• RFOG (Fiber optic gyroscope)
• Optical communication systems
• High-speed optical transmission

Transmitter Specifications

(Tc=25℃)

Parameter	Min	Typ	Max	Unit
Threshold Current (Ith)	8	15	–	mA
Output Power (30mA)	1.8	2	–	mW
Slope Efficiency	–	0.14	–	W/A
Center Wavelength	λ-5	λ	λ+5	nm
Side Mode Suppression Ratio	30	35	–	dB
Linewidth	2	3	–	MHz
Optical Isolation	25	–	–	dB
Power Monitor Current	100	300	1000	μA
Power Monitor Dark Current	–	–	10	nA
TEC Current	–	0.5	0.9	A
TEC Voltage	–	–	1.2	V
Thermistor Resistance @25℃	9.5	10	10.5	kΩ
Relative Intensity Noise	–	–	-145	dB/Hz
CSO(Ith+20mA)	–	–	-55	dBc
CTB(Ith+20mA)	–	–	-60	dBc
Tx Bandwidth (-3dB)	1.2	–	–	GHz

Receiver Specifications

(Tc=25℃)

Parameter	Symbol	Min	Typ	Max	Unit	Condition
Responsivity	R	0.8	–	–	A/W	T=-40~+85℃
Capacitance	Cpd	–	0.5	0.6	pF	Vr=5V,f=1MHz
Bandwidth	BW	1.5	–	–	GHz
Dark Current	Id	–	–	5	nA	Vr=10V
IMD2	IMD2	–	–	-70	dBc	λ=1550nm
IMD3	IMD3	–	–	-80	dBc	λ=1550nm
Reverse Voltage	VR	–	–	30	V
Return Loss	RL	40	–	–	dB
Cross Talk	CT	–	–	30	dB

Absolute Maximum Ratings

(Tc=25℃)

Parameter	Symbol	Min	Max	Unit
Storage Temperature	Ts	-40	85	℃
Operating Case Temperature (with heatsink)	Top	-40	85	℃
LD Forward Voltage	Vf	–	2	V
LD Forward Current	If	–	120	mA
Monitor PD Forward Current	Imf	–	2	mA
Monitor PD Reverse Voltage	Vmf	–	10	V
Analog PIN Reverse Voltage	Vr	20	–	V
Analog PIN Reverse Current	Ir	10	–	mA
Analog PIN Forward Voltage	Vf	–	0.8	V(I=3mA)
Analog PIN Forward Current	If	10	–	mA

Product Size

(in millimeters)

Pin Configuration

Pin	Symbol	Description
1	TEC+	TEC anode
2	Rth	thermistor
3	PD-	PD cathode
4	PD+	PD anode
5	LD-	LD cathode
6	LD+	LD anode
7	Rth	Thermistor
8	TEC-	TEC cathode

Pin	Symbol	Description
1	PD+	PIN anode
2	PD-	PIN cathode
3	GND	GND

Ordering Information

Family Name	BOSA	Cooled	Tx wavelength (nm)	Rx wavelength (nm)	–	Fiber	Connector
LT	B	C	1270:T27 1290:T29 1310:T31 1450:T25 1470:T47 1490:T49 1550:T55 1610:T61	1310:R31 1550:R55	–	SM	1:SC/PC 2:SC/APC 3:SC/UPC 4:FC/PC 5:FC/APC 6:FC/UPC 7:LC/PC 8:LC/APC

Example：

Family Name	BOSA	Cooled	Tx wavelength (nm)	Rx wavelength (nm)	–	Fiber	Connector
LT	B	C	Txx	Rxx	–	SM	5