Name: BPD-002-OEM OEM Balanced Photodetector, 400 MHz AC-Coupled
Brand: Luna
SKU: BPD-002-OEM

Overview

The BPD-002-OEM is a compact, AC-coupled balanced photodetector designed for integration into larger OEM systems. It has two optical input pigtails, a balanced RF output port and two power monitor ports, all housed in a small shielding box with metal standoffs for mounting.

The module uses InGaAs photodiodes and provides an RF bandwidth of 400 MHz with a lower cutoff frequency below 1 MHz. The transimpedance amplifier and post-amplifier stages give a high conversion gain, and the balanced configuration offers a common mode rejection ratio above 25 dB. The CW balanced saturation power exceeds 120 µW at 1550 nm.

Monitor outputs

The two monitor ports have a DC to 1 kHz bandwidth and a 200 Ω output impedance. Their gains are set to compensate for differences in the responsivities of the two detectors, so equal monitor voltages indicate balanced optical inputs.

Electrical interface

RF and monitor outputs use SMA connectors. Power is supplied at ±5 V through a 12-pin, two-row header with 0.1 inch pitch. The manufacturer offers a test fixture with mating connectors and color-coded power cables to simplify bench testing of the module. The device is intended for optical coherence tomography, fiber sensor interrogators and other high-performance optical measurement systems.

Key Features

Low noise
High CMRR
AC coupled
Compact
High conversion gain
Wide bandwidth
Two 1 kHz monitor ports
Packaged in a small shielding box

Specifications

Photodetector

Photodetector type	InGaAs
Wavelength range	1060 nm, 1310nm, or 1550nm ±50nm Web page lists 1550±50nm; datasheet lists 1060, 1310 or 1550 nm versions by ordering code
PD responsivity	0.8 mA/mW at 1550 nm Includes the coupling loss of fiber to photodiode
Maximum input power	10 mW
PDL	<0.2 dB
Return loss	>45 dB

RF Output

RF bandwidth (3 dB)	≥400 MHz
Coupling	AC
Lower cutoff frequency	<1 MHz
Transimpedance gain at 50Ω	>18 × 10³ mV/mA Total, including TIA and OP-AMP
Conversion gain at 50Ω	>14 × 10³ mV/mW at 1550nm
CW balanced saturation power	>120 μW at 1550 nm
Common mode rejection ratio	>25 dB DC to 400MHz
NEP (10 - 100MHz)	<6 pW/√Hz
Bandpass ripple (150-400 MHz)	±2dB max.
RF output impedance	50 Ω
RF output voltage linear range (Vpp)	>−1V to 1V at 50Ω load; >−2V to 2V at high impedance
RF output connector	SMA

Monitor Outputs

Monitor bandwidth (3dB)	DC to 1 kHz
Monitor output impedance	200 Ω
Monitor gain	0.42 × 10³ mV/mW (high impedance) If the output voltages for the monitor ports are equal, then the photocurrents are equal
Monitor voltage (high Z and DC input)	4 V max. Instruction note states >4V
Monitor output connector	SMA

Power Supply

Power supply	±5V/200 mA
Power supply input connectors	2 rows (6 pins/row) with 0.1” pitch Connector type on module: Samtec TSW-106-05-G-S or equivalent; mating part: Samtec SLW-106-01-G-S or equivalent
PSRR	>30 dB Power supply rejection ratio, f < 1MHz, differential referred to output, ΔVCC = 30mV P-P

General

Fiber type	SMF-28e or equiv. (1310 or 1550nm)
Pigtail length	1 m
Operating temperature	0 to 50 °C Instruction note adds target 0~70 °C
Storage temperature	−40 to 85 °C
Dimensions	2.21”(L) × 1.81”(W) × 0.65”(H) Values are referenced without connectors
Test conditions	23± 5°C All specifications tested under this condition

Specifications are taken from the manufacturer's documentation. See the datasheet for complete and current values.

Options & Accessories

Option	Description
FC/PC	Connector type: FC/PC — Ordering code BPD-002-OEM-XX-XX-XXX, connector type field
FC/APC	Connector type: FC/APC — Ordering code BPD-002-OEM-XX-XX-XXX, connector type field
10	Wavelength: 1060nm — Ordering code wavelength field
13	Wavelength: 1310nm — Ordering code wavelength field
15	Wavelength: 1550nm — Ordering code wavelength field
400	Bandwidth: 400 MHz — Ordering code bandwidth field