Optoplex QPSK Mixer - Polarization Diversified Optical Hybrid

Product Description - QPSK Mixer - Polarization Diversified Optical Hybrid

Optoplex's 2X4 polarization diversified optical hybrid (aka QPSK Mixer) is a 2x4 device, which mixes an incoming signal with a local oscillator. The 4 outputs of this device are connected to 4 single-ended detectors (see the function diagram below). The device features a monolithic optical core integrating a PBS with an interferometer which is also widely used in Optoplex's interleaver and DPSK-demodulator platforms. This device is athermal, colorless, data-rate independent, compact in size and designed for manufacturability. This platform can also be extended to a 2X8 polarization diversified hybrid to incorporate with 4 pairs of balanced detectors.

The QPSK mixer is a key building block of the ever-popular polarization- and phase-diversified QPSK modulation scheme which is not only one of the leading contenders for the 100-Gb/s systems but also a awesome alternative for the 40-Gb/s systems with the potential of utilizing 10-Gb/s modulator and electronics.

Principle of Optoplex QPSK mixer

For 90° Optical Hybrid, please visit Optical Hybrid page.

Features and Benefits of QPSK Mixer

Purely passive device (no need for external electric power)
Compact size
Based on free-space bulk-optics design

Applications of QPSK Mixer

For the next-generation optical transmission system
Key component for the optical coherent detection (a detection format which has been widely used in many other communication methods, such as radio and wireless)

Standard Specifications of DQPSK Demodulator

Parameter		Unit	Specification
Wavelength Range (C-Band)		nm	1527 ~ 1567
Phase Difference¹ (between Ik and Qk), k=x or y		degree	90±10
Insertion Loss¹ (not including connector)	S (polarization scrambled) to All Outputs	dB	9.5 ~ 11.5
Insertion Loss¹ (not including connector)	L (45° linear polarized) to All Outputs	dB	9.5 ~ 11.5
Insertion Loss Uniformity¹	Among S to All Outputs; Among L to All Outputs	dB	<0.7
Insertion Loss Uniformity¹	Among All Others	dB	<1.0
Optical Return Loss		dB	>27
Optical Path Difference¹ (Skew, among Sà All Outputs)		ps	<1
Optical Path Difference¹ (Skew, among Là All Outputs)		ps	<1
Polarization extinction ratio¹ (for either S or L)		dB	>18
Max. Input Optical Power		mW	300
Operating Temperature Range		°C	0 ~ 65
Storage Temperature Range		°C	-40 ~ 85
Size (L x W x H)²		mm	48 x 31 x 10
Fiber Type (for S, Ix, Iy, Qx, Qy)		-	SMF-28 with 900 mm tight buffer
Fiber Type (for L)		-	PM with 900 mm loose tube
Fiber Pigtail Length		m	TBD
Connector Type		-	TBD

Notes:

Over the stated spectral and operating temperature ranges and all polarization states.
Not including six collimator sleeves extending from one longer side by ~18 mm.