Link

<?php

$tea_content = array(
    array(
        'type' => 'link',
        'title' => 'Never gonna give you up!',
        'id' => 'my_link_field_id',
        'description' => 'Never gonna give you up!',
        'expandable' => true,
        'default' => array(
            'url' => "http://www.youtube.com/watch?v=BROWqjuTM0g",
            'label' => 'Never gonna get you down!', //optional, display link instead
            'target' => '_blank', //optional, "_self" by default
            'rel' => 'nofollow', //optional, "external" by default
        ),
    ),
);

Retrieve data

Using the _get_option('my_link_field_id') method, you'll get (with a json_encode() display):

{
    "url": "http://www.youtube.com/watch?v=BROWqjuTM0g",
    "label": "Never gonna get you down!",
    "target": "_blank",
    "rel": "nofollow"
}

{
   "1":{
      "url":"https://www.youtube.com/watch?v=tFPSeCeMqOU",
      "label":"Ben L'Oncle Soul - Petite soeure",
      "target":"_blank",
      "rel":"follow"
   },
   "2":{
      "url":"https://www.youtube.com/watch?v=otCpCn0l4Wo",
      "label":"MC Hammer - Can't touch this",
      "target":"_blank",
      "rel":"nofollow"
   }
}