Minimum_Specs_Optical_Hybrid.pdf

2 Feb 2015

SPECIFICATION- POLARIZATION DIVERSIFIED 90 DEGREE OPTICAL HYBRID

The following are the requirements for a polarization diversified 90 degree optical hybrid for use in optical coherent detection, including as part of a dual polarized quadrature phase shift keying DP-QPSK receiver.

Input ports:

Number of input ports: 2, designed as signal input and local oscillator

(LO) input.

Fiber type: polarization maintaining (pm)

Cable type: 900 micron loose tube, preferably blue

Connector type: FC/APC with narrow key aligned to slow axis

Pigtail length: 1 meter

Input polarization: The device shall function with both input signal and local oscillator light polarized and aligned to the slow axis.

Output ports:

Number of output ports: 4.

Function of output ports: M1 provides S+L

M2 provides S-L

M3 provides S+jL

M4 provides S-jL

Fiber type: SMF-28

Cable type: 900 micron loose tube

Connector type: SC/APC

Pigtail length: 1 meter

Wavelength range: 1527 to 1567 nm

Phase difference between M1, M2, and M3, M4: 90 +/- 5 degrees

Insertion loss: S or L to all M ports < 8.5 dB

Insertion loss differences: < 0.7 dB between S to M1 and S to M2 loss

<0.7 dB between S to M3 and S to M4 loss

< 0.7 dB between L to M1 and L to M2 loss

< 0.7 dB between L to M3 and L to M4 loss

< 1 dB between all other combinations of paths

Optical Path Difference < 1 ps between M1 and M2 and between M3 and M4.

< 2 ps between any other two paths

Polarization extinction: > 18 dB

Polarization mixing: local oscillator and signal polarizations shall both be matched in both branches so as to each exhibit the polarization extinction specification.

Optical Return Loss >27 dB

Power handling: maximum power shall be at least 300 mW

Operating temperature for specs: 15 to 35 degrees C

Storage temperature: -40 to 85 degrees C

Size: 30 x 30 x 15.5 mm