Let $C$ and $D$ be points on the semicircle with center $O$ and diameter $AB$ such that $ABCD$ is a convex quadrilateral. Let $Q$ be the intersection of the diagonals $[AC]$ and $[BD]$, and $P$ be the intersection of the lines tangent to the semicircle at $C$ and $D$. If $m(\widehat{AQB})=2m(\widehat{COD})$ and $|AB|=2$, then what is $|PO|$?

$ 
\textbf{(A)}\ \sqrt 2
\qquad\textbf{(B)}\ \sqrt 3
\qquad\textbf{(C)}\ \frac{1+\sqrt 3} 2
\qquad\textbf{(D)}\ \frac{1+\sqrt 3}{2\sqrt 2}
\qquad\textbf{(E)}\ \frac{2\sqrt 3} 3
$
1. Let $\angle COD = \alpha$ and $\angle AQB = 2\alpha$. Given that $m(\widehat{AQB}) = 2m(\widehat{COD})$, we have $\angle AQB = 2\alpha$.
2. Since $AB$ is the diameter of the semicircle, $\angle ACB = \angle ADB = 90^\circ$ by the Inscribed Angle Theorem.
3. Let $C$ and $D$ be points on the semicircle such that $ABCD$ forms a convex quadrilateral. The diagonals $AC$ and $BD$ intersect at $Q$.
4. The lines tangent to the semicircle at $C$ and $D$ intersect at $P$. These tangents are perpendicular to the radii $OC$ and $OD$ respectively.
5. Since $AB$ is the diameter and $|AB| = 2$, the radius $OA = OB = 1$.
6. Consider the angles formed by the tangents and the radii. Since $OC$ and $OD$ are radii, $\angle OCP = \angle ODP = 90^\circ$.
7. The angle $\angle COD = \alpha$ implies that $\angle COQ = \alpha$ and $\angle DOQ = \alpha$.
8. Since $\angle AQB = 2\alpha$, and $\angle COD = \alpha$, we have $\angle AQD = 180^\circ - \angle AQB = 180^\circ - 2\alpha$.
9. By the properties of the inscribed angles, $\angle CAD = 90^\circ - \angle AQD = 90^\circ - (180^\circ - 2\alpha) = 2\alpha - 90^\circ$.
10. Using the relationship between the angles, we have $2(2\alpha - 90^\circ) = \alpha$, which simplifies to $4\alpha - 180^\circ = \alpha$.
11. Solving for $\alpha$, we get $3\alpha = 180^\circ \implies \alpha = 60^\circ$.
12. Since $\alpha = 60^\circ$, $\triangle PCO$ is a 30-60-90 triangle.
13. In a 30-60-90 triangle, the sides are in the ratio $1 : \sqrt{3} : 2$. Given $CO = 1$, the length $PO$ is $\frac{2\sqrt{3}}{3}$.

The final answer is $\boxed{\frac{2\sqrt{3}}{3}}$.