Chiral Photonics’ Pitch Reducing Optical Fiber Array (PROFA) enables ultra-dense 2D fiber array interface

Chiral Photonics

March 4, 2012

Pine Brook, NJ, 4-Mar-2012. The PROFA product line, an evolution of Chiral Photonics’ (CPI) successful Spot Size Converting Interconnects (SSCIs) that interface standard optical fibers with photonic integrated circuits (PICs), PROFA is a multichannel, two-dimensional dense fiber array best suited for interfacing to, for example, VCSELs, receivers or vertically coupled gratings. A monolithic glass structure incorporating an adiabatic taper and integrated pigtails brings multiple optical channels close together for efficient, space-saving coupling. The technology reduces channel pitch while tailoring numerical aperture (NA) of individual channels and can also be used for power combing and interfacing to multicore fibers.

Traditional solutions for coupling PICs utilize GRIN lens technology, lensed fibers with v-grooves or other solutions which rely on air gaps and more complex alignment techniques. These techniques are suitable for moderate channel densities but pose substantial thermal expansion/excursion and related reliability challenges. An additional limitation of a conventional, lens-based coupling technique is its inability to control channel spacing and NA independently.

Chiral Photonics

Based on work developing a 60+ channel PROFA, CPI believes that there is an opportunity to introduce a closely related (N+1) x 1 combiner whose primary advantages are:

• Improved insertion loss on the signal channel: ≤ 0.3 dB

• Increased number of combined fibers: 37 in the near term (able to be increased soon thereafter)

• Configurable pump geometry to maximize pump conversion efficiency

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